Java Projects For Intermediates

1. Introduction to class: Hi, I'm Maddie. I have been programming for more than three years now. This course is designed for intermediate to have knowledge of Java syntax and know how to write basic Java programs. And who really want to learn how to build Java projects to improve their knowledge. In this course, I am going to build Java projects from the scratch on how to go from not knowing anything about the basic concepts to building the projects forward and few small concepts. Don't worry, I will be revising in this course, I think now it is a great time for you to learn Java because nowadays most companies are looking for candidates, have a good understanding of Java and have basics and have built some Java projects during their learning phase. Using the knowledge of Java, you can learn and build even more good products which can be used by millions of people all around the world. Now, I think that's pretty amazing. What will you learn in this course? So this is a current song course, which means you will learn by doing it. First, I will show you how to set up your development machine on Windows PC. Then we will dive headfirst into Java fundamentals which are required for project per post. So you have a full understanding of the Java programming language which we will be using to build projects. We will create several projects such as email administration and many more. And I will make sure to update this course with a new projects. One of the great things about this course is that you don't need any prior experience at all. Really, all you need is just a computer and discourse. I believe that anyone can learn how to build projects. My goal in this course is to teach you all the skills that you need to become a good at building basic Java projects. All right, So let's get started. 2. Introduction to Project and setup - Email Administration System: In this project, Java inbuilt administration, we're going to learn very Java project focused on object oriented design in the real world application. So this is e-mail Administration project where all the details like creating mail, firstName and lastName, then giving the company department, like pileated to that company department than creating some system generated password. As I link to that particular e-mail, we are going to create your email Administration project. In this project, we're going to use some basic concepts of Java object code into design on Java, then abstraction of Java. How we can secure our password and everything like abstract that password. Also, we're going to learn how we can execute or create some files in Java. It's like file handling in Java. So after creating all the details like email, the passwords, FirstName, LastName, we're going to store that particular data or information in a text file. So let's see how we can proceed with this project. So first we are going to learn or we're going to see our project aim. So consider, you are an IT support administrator or something like that. Is your post or warfare going to do is your task is creating e-mail occurs for the new hires or the new employees. You need firstName and lastName only from the user, or we can say for the new employees. So using that, you are going to be e-mail, new email with another details. So steps of our development for this project is first, this project setup. Hope we're going to set up all the things in this. Secondly, basic fundamental concepts in Java. We're going to use for Java basically here, I'm accessing data. Methods are all the abstractions of classes in Java. Here we are going to see basic concepts like building objects, classes and methods for file handling. In Java. Basically, we are going to create one text file, TXT file. And we're going to store all the data in it, and we're going to retrieve that information also briefly creating execution file of jar, like while. In this project we are going to create multiple classes, so Java files. But after that, we are compiling it into the single execution jar file. So this is our basic project or steps of development we're going to use here. So our application requirements, so we can see how we can proceed with our requirements. First, we're going to need one JDK. I'm going to explain what is meant by JDK in Java. And second is Id. Id, basically integrated development environment for Java. So there are multiple IDs in this field. We're going to see how we can use that for our application. First is our basic thing is generating an email with a syntax like firstName, lastName, department.company.com. So here, first name, last name and department is given from the user. Let's say the department, I'm considering here, sales development according here. If none is given from the new employee than that blank will be there in the email. Generate random strings for the password. It's our third aim of our application. Application should have some certain methods to change the password, then set the mailbox capacity, basically the Min capacity and defined alternate e-mail address. This is also going from the user only, or we can say new hire only. It should have some GET methods to display the name, email and the mailbox capacity when we are going to track that email address also. And it should have some by handling methods. Or we can say file handling methods to store some data in the TXT file. So it will store data and retrieve data also. So this is our application requirements. And here we will require two tools, JDK, basically Java Development Kit and IDE, Integrated Development Environment. So first, we need to need an ID. There are few famous IDEs like Eclipse or IntelliJ, ID, etc. In this Java development project, I'm going to use intelligent ID. So we are going to use integer id has already for the Java development. So in this project, we're going to build our whole project using this ID. For the JDK, we're going to use Java SE, which lets you deploy and develop Java applications on desktops and servers. When I was recording this video, the latest version is it in generation JDK? When you are watching, there might be a higher version. Make sure you download the latest stable version, which is available at the time of watching this video. To download IntelliJ GID visit our official website and go to the downloads page. There are two versions of this id, ultimate and community version. If you have a student email ID, you could request for a community version which will be very helpful in the future. If you don't have, then you can download ultimate version, which is free to download for everyone donor as per your operating systems and install it. And for Java SE, you need to search for the JDK download on your browser and open website and go to the download section based on your operating system and install it. Once you have installed it, it's id will automatically detect the part of the JDK. So these are about all your tools required to build this project. So first, let's see what is meant by JRE, JVM, JDK. So just we don't honor the JDK, the Java. It is a C version, Standard Edition version generation, which is basically the JDK, JDK contents Jerry and JVM. Jvm is a smallest part of the JDK. Jvm is the Java Virtual Machine. As the name suggests, it does not physically exist. It's not physically exist on system. It's virtual machine, but its maiden name is for the main function is it promotes the runtime environment in which Java byte code executes. So what is meant by bytecode is basically you are creating some Java syntax or it's higher-level language you are writing. But machine knows the lower level language, 1010, machine-level language. It basically converts that bytecode and executed that bytecode. It also runs programs in other languages, but compiling Java. So basically, if you created some other languages, I mean by Kirklin or other support by the JVM also. So what is the main function of JVM? Easier to notice the core, it verifies the code, it executed the core and provides the runtime environment. Second part is JRE Java Runtime Environment. Jre download random environment is a software package that provides Java class libraries, java Virtual Machines, and other components that are required to require to run Java applications. Jre is a superset of JVM, as you can see in the diagram. So Java runtime environment, if you need to run Java programs, but not deploy, but not develop them. Jerry's, what do you need? You can download jeering from the Java Runtime Environment. Donald speech. It is a set of tools, libraries, and some JAR files, Java archive files. It is used in Java application programs that we're going to create. An introvert is implementation of the JVM. It physically existing JDK as its runtime environment is just a set of programs protocols in the JDK. It contains JRE, JVM, Java compiler, Java questions basically different versions or the related files and everything you'd contents. Let see what is the structure of that. Jdk is the superclass, or we can say all the union classes of Jerry and JVM. Jvm is a smallest part, then Java and the time environment contents, Some settler, some set of libraries, Jarvis, some other files also. It contains, it contains a JVM, as I said, this clear GRE and this is development tools contains Java files, Java compiler files, Java files and GRE, JVM, and all mixture is Jenny k. So just to be downloaded JDK, it contains a JVM Jerry and everything, even execute our Java file and it will do our desired output, what we're going to proceed with. So this is the basic consists of JIRA, JVM, and JDK. We will see how we can set up our environment or our project for our application, even administration application. Once you install our ID, ID, you can see this welcome screen. Before that, I already installed in my system. So before that you should set some configurations like phone, text, everything. So once this is done, you can see the screen. So here I'm going to create a new project here, new project. It will take them some time to create a new project. Once your project is cricket, I'm going to create here. Once the screen is loaded, you have to specify a JDK, or we can say it's decayed. So it will automatically detect your SDKs. Here, I'm using I'm using version of JDK. So I am choosing this. No need to install any additional libraries like Groovy or Kirklin here. No need to specify some user-defined libraries also, just click the Next. Don't check this. It will create some default templates. We don't want to create some default templates here. Great, Next, before that, do the project name, the project location. Like I have given. For this, I'm going to specify the project name as email application. You can specify your name, your own name, also, project name. I'm going to specify email application. Click the Finish button. It will take some time to create indexing and everything. But once it is loaded, it will show the screen also wait for creating a new project. It will take time. Wherefore it showing the loading here you can see. So wait for that scanning and indexing everything. It will automatically create all the folders, let it to a project. So now we're done with our setup. So we specify the JDK and then we created our new project. Now, you can see this is a project email application and you can see all the related files here. That is Door ID, that is then SRC. Src folder is the main folder we're going to create here all the applications in this. Then this is the IML file and all the different libraries and everything. So here, this is only Java files we're going to use. So this is not at all required to see. This is makefile we're going to use. So we're done with our setup. Now, we will see how we can proceed with the project. So what does this setup is done? And all the things are index should I unloaded? Now, what you are going to do is click this SLC, right-click here. It will take time to load. So just right-click here. It will give all the options related to this. Click on New. You can see every option, what we can make in this. So what we needed, we needed to create some Java files. So we need to create Java class. But before that, what I'm going to do is I'm creating these Java classes. We are going to proceed with some packages. What is a package in Java is I'm going to store that specific classes in some files. So this is a very basic project. In further projects, we are going to create some large projects in that part. We need to create some different packages, like in the industry also, once for the small, small requirements, we can create small, small packages. So once package is done, specify the name. You can see the package here. So I given the name as email up here for that package, it will create some simple folders for the classes. Now, Jews this email up, right-click on that. And here I'm going to create a class. For this, we need to create two classes. So what is the requirement of creating two classes? You will ask me, in one class, we're going to create a main method, which is basically executing the methods in another Java file or class. We are going to create all, we're going to specify all of our methods. So first, let's see that method part, or we can see what we're going to specify in that part. Let's see that part. First, I'm going to create a Java class and in this specified name for the specified name for this Java class as e-mail. I'm going to do as email. Once it is done, it will load the class. So you can see it will load this class for us with some default structure. Let us see what is this structure first, you can hide this part also here. I'm going to leave this and let's see what is this vesicular structures. This is a package name, email app we created under this, and this is our class. So we're done with the primary setup of this public class male. This is a class syntax for that we will, in this folder, we're going to see how we can proceed with what is meant by class, methods, everything, and how we can proceed without project this. See you guys in the next video. 3. Creating classes and methods - Part 1: So we have seen this is setup of our project. So we just created one package known as email. And we created a class which is basically publicly specified class. Now I will explain what is a blueprint of a project. Then I will explain some basics of class, methods and objects, etc. So let us see what is the blueprint of a project. So project blueprint is considered. This is the this is a package, package, the medulla, this is email class and method I created. So this is the project blueprint. Back is email, our email blast method, which I created before, an id which are short. So now this is done. These things are done basically in future. What we're going to do as we move in a project, we will create one main class. We will load all the methods, this using objects. We will execute these methods inside this main plus. This is our main project blueprint. So let us see what is basically Java classes methods. So Java class, Let's see, gosh thing about plants. Everything in Java is associated with classes and objects, with our classes and not do it. You cannot create any poor or we can say any method in Java. So it contains attributes and methods. Attributes are basically what we can see is pluses. Last attribute is grave some environment for method. So for example, in real life example, you can consider God is an object. Car as attributes such as color. The color and methods are such like Dr. break and something like that. So basically V, what we can, we can create car as a class. Digital attributes are red color then model numbers, etc. And methods. Car can stop dry, you can break, etc. So glass is like an object constructor. We can see it creates the object, or we can construct the object, or it can be blueprint for creating objects. Classes also hold some user-defined attributes to pass values or input from user. So we can view the user defined attributes also inside the classes. Now, what is meant by objects in Java? So objects are basically associated with the classes. But what is the simplest form? We can say that to use a class object is used basically. So if you define some class and you want to use the class, you have to define the objects as glass. Glass is already created. We have to only just create the object for that particular class. We created already that object. We can easily create their objects. But first-class than we can create the object. So this is all about the class. Now, let us see what we're going to do in a project. So before going any further, I will proceed with board or a project. Let us see. So inside this, I created this class. So I need to create some methods, but before that we need to invoke some libraries. So for the libraries, I'm going to put import Java, util dot star. I will explain what is this meaning. I'm going to use this, but I'm not currently using this library. But ID is showing this. You are not using this library currently. But what is significance of this? This is very important library, java.util dot star, meaning it is in a util. I'm using all the things that we can say. It is very basic library inside Java and others like same library. I'm going to use these import java dot, dot star. It is basically input output library invoking taking user inputs. It will be helpful library. So as this is done, our first thing, I'm going to explain here how to take user inputs in Java. You can do a scanner, which is the default method. We can say our default matter for data inputs. I'm going to use this. I'm going to invoke insert class only because I'm going to specify it's public. So what I can do is public scanner. Public is access specifier, public scanner. As you invoke scanner, you can see now the java dot util, it started. So the Scanner class is belongs to this library, java.util. By default, I will say equals new scanner. This is the syntax, basically syntax to invoke scanner inside the brackets, you need to write system dot in, which is basically the method. So this is done for now. Now, I'm going to set up some variables here. So for this, I will explain, I will have some comment for explanation purposes. Now setting variables, I'm going to set some variables here. But for the security issue, we can say, I've weren't going to create some abstract thing here. But I'm going to do is I'm going to private here. This is a publicly given. I'm going to use your private access modifier. So let us consider this product string. I'm going to specify for the string fname, basically firstName, severely private access modifier, private string, last name. Similarly, like this, I'm going to create some similar like department then for email, then for the password. Now, consider this. I'm going to specify all these things in a string method only light string as a variable only. Now I'm going to specify its Min capacity, which is integer capacities 500. I'm considering by default founder NB than poverty. Private string. Again, I'll connect me basically string underscore email. So we're done with this. We're done with, with this. Now remember, these are the global, all we can say. These are strings can be accessible throughout this class. So in the class, I can create as much as I want four methods. So I can use this trough, this class, as you can see, this class Enter, I can use gourd this class. So we're done with creating some variables. And I am setting this to the private to not to do access directly. Basically, once it is done, no one can access it as it is. Provide this as if it's orchestrated whereas probate. So we'll let us see with some constructor method what is meant by methods in general. Okay, So Java class, we have seen. So as I told you, I will tell you some more about glass. Glass is basically a blueprint we have seen. So glass is something like it stores the functions or methods in one block of code. Basically, consider an example, sketch of a house. Is it less than it contains all the details about the prototype of the house, house doors, windows, etc. Now, how's is an object of that class? Sketch of hose. Basically, I created this sketch off. Now, how's is an object? So what we want V I can do is plus contains all the properties of that object related syntax to declare it. And I told you last class we created in there. I'm going to specify access specifier before that. Consider that if you are not given if you're not given any access specifier, that by default it will be different access specifier, which is basically public only in Java. But if you can specify public, private and protected, protected means fully protected line, you have to invoke if small, what we can say are two methods for privacy and security. So as I told you object, we are going to create objects. I'm not created here any object, but we're going to create an object for that part goes only. So it's basically user to call glass or Mexico. That class object is also called as an instance of a class is we thought our object, we cannot call class. Always. Remember that to call the class, we have to use the object. So for that example, previous example, as I told you, sketch of the house, glass sketch of a house. Doors and windows has some methods, or we can say functions inside this. So this is the main method. If you know that in the Java public static void domain is a different method to execute any program in Java. Without this, you cannot start the program, or we, or you cannot execute the program. For that sketch of the house. I created this object OBJ. You can see more videos like this and execute that object. We are going to see in further details about Java objects. So for now, Java methods, now why we need mentors. So I will show an ID. Basically, if I want to print something in IT might default method is System.out. You can see the edit here, basically, System.out and error. It is not invertible inside any plus y. The thing is it's only defined with that method. So first, create a method, create a class inside that. Create some methods that you can invoke it in art mentor as simple as that. So methods are declared within the classes. It contains whole core of particular functions, methods, contents, return, value, and access specifier. There are the object classes. They are the object classes. As object classes are created, we can easily access methods using that object. Main method is default method, as I told you to learn or build our project. Anything main method, always remember public static, environment. And it's always returns the strings. You cannot change to integers or something like that. You can print integers, but you cannot return integers in certain main methods. Packages or Java. As I told you, I'm against telling you. I always do that. It's just for creating a for-loop. I'm storing all the classes inside it. Now there are two methods. User-defined methods are shattered library methods. User-defined methods are like I created. I'm going to create some methods here. Similarly like that, you can also create some user-defined methods. Basically, it shows that it's usually defined methods. There are some standard library method that I created, scan or system. All those types of standard library methods that I mentioned built in methods and Java. So if you want to check number, even, then you can create some even our functions. There's user-defined, but I have specified some library methods like random system. These are system defined methods. So now let's move on to our code. Now let's see how, how to, how we can proceed with building or object. We created all the things here. Now I want to create one constructed. Know what constructor will loop. It will print what I want basically, first thing, second thing, it will give me the output as well as creating itself is like a privacy thing inside the Java. I'm going to invoke all. I'm going to run only constructor. So it will not use this private string or something like that. It will take value from that, but you cannot change its value. Or we can say third party cannot change this value. Private access modifier value. Just I'm going to create it. So constructed, I'm going to specify that here. First name, last name, and everything. That's it. I'm going to tell like only for that only like first-time, last time, That's it. You can do it to some other names also. But be careful about the name. Now, consider, I'm going to create this as a public. Always remember class and constructor has the same name. So I'm going to do the constructor attributes, same names I'm giving you were inside the constructor. You have to use the same name. After that, you need to specify something like this. Like this F and this F name are totally different. 4. Creating classes and methods - Part 2 : So in previous video or in the previous project steps, what we did is we created one class, E-mail Plus, we created one Scanner class which is publicly available. Always remember this scanner class is global. I will write here also global. Global. You can use this scanner on, in this our project. Then these are, these strings are also globally available. You can use this inside this email class and we're going to use in inside this class also. So all these are about creating class. We created, we already created this class. Now we're created one constructor to receive the firstName and lastName. Now, what is the significance of constructor is, I'm putting here only these parameters. I'm putting here. It's not like abstracted or something. You are using that class and you are not secure and anyone can change that part, like your first name or your last name, they can change it. So significance of this is creating constructor, insular issue of firstName and lastName and protect that from original one, which is private String, firstName and the last name. So let's move further. Now in this constructor, what I'm going to do, I'm going to assign this F name, this F9. To do this, what we're going to use, this keyword, this dot F name is equal to fname. Similarly, for this also like this lastname email name, basically this L name, basically this dot l m is equal to Lm. So what happened is you can see these are, these are all equal now. So it is not just forwarding the value, it's copying that value from here to here. When we're going to run this program, I'm going to print out system dot out, dot, print LN. Insert this. I'm going to bring like new employee plus this dot name. Plus I'm going to give some small gap here in between and then this dot L name. So we are done with constructed. Now inside this, we're going to develop more in this constructor. So I am leaving some space here. Now we're going to create some methods. So from the PowerPoint template, we already know we now want to create some email, generic email password. For that, we need to create some methods. So let's start with creating some methods here. So let's begin with some department asking the department and then password. Okay, let's start with generating email, generate main method. Now, remember, this should be private, so I'm creating private. It's not like you have to always create it private. You can create it public also. But to achieve abstraction, I'm going to use private. It's going to return string. So string, generate email. This is the syntax of creating the methods. Now what it will return, it will return email. This format is this dark F9. So if you are putting, if you are putting firstName and capital and email is always in small letter. To convert these to all small letters are lowercases. There is a system default method, or we can say user library. To lowercase. You can see two lowercase. You can put two lowercase here. So what it will do if you put all the capitals, even if you are putting all the capitals, it will create a small case letters. Similarly, we need to put a dot here. Plus again this real name dot, two lowercase. Now, we want to pause here and add, add the symbol than this door department, DPT dot to lowercase. This syntax, as I told you about all these syntax here, plus.company.com, this is simple remaining. So what it will do, it will take FirstName, LastName from the user. Even put with a department, it's just generating the mill. Now, we will move further. So what we need is we created the first method. We're going to move in a second method, asking for department. Asking for department. Again, private private string department. Certainly. I'm putting in now I need to put some user interaction with, I'm not going to assign directly. For that administrator, it will ask Which department do you want to go? So I will put here first system, dot out dot print LN department goals than what it would be print. It will print department course basically. But likewise, this one for sales, remember, slashing will be called in the next line, next line, or the new line, or for the new line, I am putting slashing for development. Third department, I'm going to pull these for the accounting department. And last time putting 0 for none. Nothing I'm going to mention here anything I'm putting here none. So now what I want to create some loop, or what we can say, choosing part here, that 123. So you can go through the two main guesses, light switch gaze or something. But I'm going to use, Here's which case. You can use if-else also, but using switch gears is more efficient here. So I will create one flag here. Let me tell you why I'm going to use flag. Because I want to execute it again and again. Like if I am not going to execute it again and again, it will generate only first time. All we can say if you're entering first employ, it will ask, I will. I want to cook for multiple employees. So I want to create some new. I'm going to use your do-while loop. I'm going to use do-while loop is very important here. I want to execute at least one time, and the do-while loop will execute at least one time. For other loops, like for loop while loop, for-each loop or an answer for loop in Java, there is no condition. There is not any condition. It can move for one. But do-while loop, we will run at least one time. So I will do here first. If you know the syntax do, then I will put here a system dot. I'm going to ask like system dot out, dot, print LN and just enter department code. So this is very simple part department code. After that, I will create one variable choice. Now I'm, what I'm going to do is next. You will understand what is this. Yes. Yes. Is the standard bar scanner, public scanner part. So I'm going to use this to take user input. Now switch, switch toys, I will put then guess one. You feel now case one, redundancies. If it's putting the ideal condition, you have to bake it, but there is not any significance for this. You have to put a break statement here. But I'm going to just returning this. So it will return only in one time. It will not again and again start looping inside this, which case? Just returning. We don't need any brake line here. Guess three written accounting. And if is 0 returns none, 0 returns none. That's it. We're done with this. But like we're missing something. Like we did want to exit that loop and we want to create some default condition. So we are done with our logic, but we're not done with our perfect cool. Let me complete that one. But also before I will print here, system dot out, dot print LN, invalid choice. Please choose it again. Now, we're done with this no switch case. Now, I will end do while loop. So this is a do part here. So I will put Wiley Here flag. So what we do as flag is always false, not means always true. It will return none. That's it. So what it will do, it will execute at least one time written none. So now we're done with this part. As you can see, what we did here. Let me summarize this. So what we did is we created one constructor, public image String, firstName, lastName, put some parameters. We invoke it with this name. Fname. So what we are doing, we are going to assign this fname, Buddhist name, this last name, but his last name. And I'm going to print this here. So now constructor part is not done. We are going to create and invoke some other methods also there. But it's initial condition for the constructor. Now, I started with our method. I created first private string generator main method. So what it will do, it will do generating the male according towards syntax. So this written, this door, fname dot two lowercase into dark. Like this, dark, these are the lines. What is the significance? This dot F9 to this F name here, dark to lowercase. It will convert all the strings into the lowercase. So no need to worry about the uppercase and lowercase. Then dot, then again, this for the last name, and this for department, this for the company.com. So it will generate that mean according to that. After that, I want to say department, but setting the department is all about the process from user or we can say administrator. So I will put here 1230 for the auctions. Since the allotment accounting respectively. Then I will create one Boolean flag to execute that loop. I'm going to use a do while loop because it will at least be run one time. Again, the department core four twice I'm giving I'm using the switch case method here. Switch case conditions you can use if else conditions also, but it will be goo much time to execute that to reduce the time complexity here, I use choice, guess one, return series for the development and accordingly to that default condition, exiting the do-while loop with the flag and retaining all. So I created two methods here, generating a male and insert department. So now we're done with this. So I will explain what is the significance of this part also. So this will assign. Now, you understood that part. So let's try with so let's try it. What is this part? So let me show you what is the significance. So this is the reference variable that returns the current object. It gives text and behavior of the object. Global variables and class variables are all the same. You want to invoke it the same, it will assign it, and we just do, the global variable is different and plasma is also same. For that purpose, we just use this word. If this is not in here, it will return null value. If local variable and instance variables are different, there is no need to use if both difference are different. Like globalist, different variables, different, but you want to assign it to, is equal to, equal to. You can do names should be different. So awarding using different names, I use this keyword and this is very efficient. Also, this can be used to invoke current class constructor. What I did in this part. We invoke the constructor. So we will move further with another methods also here. So let us see what are the other methods we're going to see. We will see in next video, guys, that's it for now. 5. Random password generation method: So in the previous part, what we learned is about creating constructor, creating two methods. We created already two methods, generating male and said department. Now let us see what we are going to do further. For this, I'm going to explain how we can create random password here. So generate random passwords method. Then again, I'm considering here string only. So pyruvate string, generate underscore password. Now what I'm going to do, I'm going to put here some parameters, integer length. Because I want to specify the length of the password. Then I will create one exerting method. Here. It is random. So if you know there is one in java.util, there is a class called random, which I already removed it, but it will be very helpful to create some random things inside Java. You can print any random number using this, or you can generate any random string here. So first, I'm going to put here a string, capital characters, because we want to create some set of capital characters here. Right? Alphabet from a to Z in all uppercases, or in capital form. Like a, B, C, D, like that. So once you are done with this, so that's it, are done with the capital letters. Now. Similarly, small letters are lowercases. So I am placing here Control D, just Control D to put copy that part and change the variable name from capital letters. Capital characters, whose moral character? I am going to type here, all small characters from a to Z. So we are done with writing small characters. Now, we need to also include numbers, because there are numbers also in the passwords. So create a string with a variable limb as numbers. Type the numbers from 0 to nine. Once you are done with this lesson within the double-quotes to make it as a string. Now, some symbols. So what I'm going to do, I'm creating some set, as you can see, the strings, like these other strings only, but for the symbol is capital characters, characters, small character serves symbol. I'm considering all the symbols like exclamation, mark, hashtag than dollar, dollar symbol per symbol. Now, we will create a string for symbols also. So what I'm going to do, what I'm doing, I'm creating some search, as you can see, of the strings. Like these are the strings only births per symbol is capital letters, characters, small character sets. The symbols. I'm considering all the symbols like exclamation mark or the hashtag symbol, percent symbol. And again, question mark, question mark. Then I create a string value. Value is basically just what is, what we can say is it's like we're going to mix all the capital letters, small letters, numbers, symbols together, and one strong password, the user. What we'll be considering here is all capital characters plus small characters, last numbers plus symbols. So we are done with what is the syntax like. It will include capitals, small characters, numbers, symbols. These are the system default passwords. This is for system default passwords. Now let's move it further. How we can generate some random. So first, create a string for password. Because first-time it is null. Then it will append some password here, then use for loop integer I is the instant variable. Again, to loop it. Next condition is I less than the length I plus plus simple disease. The conditions for the for loop now use this password variable we just created a bot. Password is equal to, equal to password. What it will do, it will put that value characters at index. Then are. We have to remember what is the R which we have initialized previously is for that random method. Any random thing from that, all the search, and we'll put inside these random dot. Next thing. Next thing, because for this, I will choose next thing than inside this next values dot length because it will stop at the length part. Also. Simply write a line to return password. So what it will do, the significance of this is this will take this from this all serves. No password will be assigned with password plus r at the values, character, character, character. On random mixing. It will choose random from this also the random position of that password that it will create the password. So now I'm not giving the fixer land for this, but for that purpose, it will choose the land automatically. Here, we will see how we can set the length of the password in the next part. So this is for generating random password method. Now, we will learn how to create the specific change password method. For clean core purpose, I am writing comments as change password method. So it will be very easy for anyone to understand the coding part. Change password method. I want to set its access modifier to public. Now, you may be thinking that why it has to be public. We have previously made other methods as pyruvate and why this method has to be public. Why? Basically change password method is for the user who wants to change the password is not for the system. Users will change the password whenever they want. So we need to create it as a public, so any public user can access it and change it. Again, I am going to use some strings here, but it should be public for the user significance. So let's try it public access modifier and set the name of the method as underscore password. Let void, return type. It means it does not return anything. Just prayed. I want to create some loop here. The thing is before like set password, you know, do you want to choose change your password and press Y or yen? Then similarly, like that, I want to create here some condition for that Boolean fly is equal to false. Similarly, we have created for that department method. We are creating similarly for this also do loop. Let's see, do-while loop. Then let's write the core system dot out, dot, print, LN. Insert this method. Do you want to change your password? Exclamation mark, white slash yen. So you'd will be displayed to the user. Wait for the user input. Either yes or no. Now, we need to store the user stories or no in some character. So for that, what we can do is initialize the character. Again, I'm creating character here. Remember, like we already created suitcase, those are for the State Department method. So they both are different because scope of it within the department method. You should not be confused at this part. Now, I'm creating for the character. Character choice is equal to, yes, don't know what it will do. If you use is putting S or something like that, then it will return some error. To avoid that error, what I can do, just choose the first character. So what I can do is yes dot next character at 0, index 0 to index, you know, all you know about that array starts from zeros. Similarly, cat starts or string starts from 0. Then let's use a for loop. If choice is equal to, equal to y, I can say if choice is equal to, equal to small y, or condition, I just put our condition here, small white. What it will do is once flag is true, it will stop that part also do while loop. So I'm going to just putting flat is equal to two. Now, we will ask the user to enter the current password using system dot out dot print LN. So it will ask user for their current password on a console. So this is one of what we can say is the most biggest part of our project. Set password. Then string, I'm going to create some temporary variable to assign that entering that part and putting Next for the user. Again, we will use if loops. If it's equal to that password, equals this dot password, what will it will be as good as it will ask about new password, system dot out, dot print LN, enter the password. Once this is, what it can do is this password, it will just append this dark dot. Next, we'll append to that part and it will tell the user that password as tenured, successfully reaching their password, successfully password changer. If password is wrong, if your password is, this else part is wrong. So what it will do, it should print on the console as incorrect password. Write system dot out, dot print LN inside the brackets, incorrect password within the double-quotes. Now, if, what if I choose is not this? For that purpose, I'm going to create another thing else-if you know that elseif is another Florida, even like that, I will create here also. Wait for a minute. Choice. E is equal to, equal to capital N is equal to, equal to small n. Inside living right? Flag equals to true. It will on the console as a password change your cancer option. You didn't system dot out dot print LN. That's it. Now, I will create some defaulting here, like system dot out, dot, print, LN, invalid choice or something. And after this, I will end up while loop with similar condition, like not equal to flag. And that's it. Now we are done with our third password method. This is the very biggest part. As you know, in this, what I did is I created here password method, public, void, set, password, boolean flag is equal to false. Do while loop. I first put that. Do you want to change your password or no? Then I will enter from the user. I will ask for the user to press Y or N. If user presses right, it will change the password. But before that, it will ask for the current password. If that password, current password does not fit, the current password matches with the old password, like you haven't heard before. It will proceed with the new password. If not, it will print on the console as incurred as incorrect. And if you are pressing bar or yen, then it will, that option will be cancelled. Orders if you are putting some different like why other than while Arianne or something, it will ask for enter a valid choice. And then I'm exerting that Lou exiting the loop. Similarly for that, I'm going to create some SEC mailbox capacity than for alternate male that display the information of the user than storing the file and every method. So that suits me, see the other methods in the next part. 6. Set methods of project: So all of you already know that we created three methods here. Change password method, set Department method of generating random password method. Now what I'm going to do is I'm just going to say that male capacity. Now, remember in this first also, I told you by default, which is 500 MB. But if the user wants to extend that mailbox capacity, I am asking for the mailbox capacity here method. So after this part, I will create some set mailbox capacity method. So I am writing command as mailbox capacity methods to understand for everyone to not to get confused in the future. I recommend you to do the same. Then. Now we're making it as public as I told you, why should it be public? Because user wants to access that path and return type is void. Write it as meld score CAP as the method name. That since there is no need to put any arguments here, because it's not right now needed if there is any need in the future. So now let's write system dot dog. Inside this, within the double-quotes, right? Correct. Capacity. Even print the current capacity. Easy, we're doing this dot mil capacity. I am considering this is the first in m b naught in D beats. So I know this is very less, but I want to clearly simplify this in MBB only system, dot out, dot, print LN. There is no need to ask for what is your first capacity or something. I just want to create or assign that. So enter new capacity. New mailbox capacity, right? This within the double-quotes and this male capacity is equal to yes. Next, it is integer only. No need to put anything here next. And it feels like system dot out, dot, print LN within the double-quotes, right? Mailbox capacity successfully changed it. When you write this, it will be displayed on the console. This is all about inserting the mailbox availability. It is very easy printing first current capacity than enter the new mailbox capacity and from the user and just assign it to the new mailbox capacity is set by user. Asked her whether you use it to set. Similarly for that, we will create another method for alternate male. We will make the access specifier as public body. Let's eat return type void, which means it does not return anything. Let's give a name for this alternate email. Email method. I am writing commit as male method to understand for everyone not to get confused in the future. I recommend you to do the same. After writing these comments. Right? It along with me. System dot out, dot, print, LN within the double-quotes, alternate mail or email. Then in the next line and write this dot. You know that we created already, created that part. Now this dot is equal to S dot. Next, this is very simple method here. You don't need to worry about this next line. And right now we've user on the console that alternate mail or e-mail is said using system dot out, dot, print, LN at that. See, now, this is all about creating or generating something. But I want to create another, another method to display something because we are just generating. But there is nothing I'm going to display here. How can I display the user information or something that could display user information? I will create another method. So I am writing comment as display user information methods to understand for everyone and to not to get confused in the future. I recommend you to do the same. Now, we're making it as public as I told you. Why should it be public? Because user wants to access that part and written type of foods let it be wide. Write the method name as Get info. It's very simple. Just needed to create the info of the user. Nothing other than that. To print something on the console. System dot print LN. We're just using printing statements here. Only. Insert the brackets right along with me as new. Within the double-quotes. This F name, you some space between two of them for that user empty quotes. Then write this dark yellow limb. Similarly, in the next slide, write system dot out, dot print LN within the double-quotes, right? Department next to that plus symbol, right? This BPD, which means department. Similarly in the next line for the e-mail, we can write system dot out, dot, print LN. We did this double cords, right? Email, symbol. Write this email, which means e-mail. Basically displaying all the user information. Then if you want to put password, you can put the password. But here where the ideal condition you should print any password here or you should not display any password for the security reasons. But for a significant convenience of this project, I want to check it will be running or not. So I'm going to put here only. So this is for the testing purpose for our application. This is not password. Then again, write system dot out, dot print, LN, mailbox capacity, male capacity. Let's also write NB, also within the double-quotes, like I am already mentioned. I'm writing it in M B only. Then again, system dot out, dot print LN double codes, right, as ultimate email. After that, add a plus symbol, write this email, which means Amun, and that's it. Now, we are done with these matters. So let's cross check. But before that, remember, via remaining with some other methods, also store files. This. But before that, I will explain the constructor part here. We already created what constructor here. And before that creating construct the water, it is set mailbox capacity and then set password method. I alternate e-mail method or display user information method. And that's it. We're done. Then we want to call the methods. So calling that method is very simple, I can say. So. Now I will go to this constructor part here. As you can see. Now, I'm putting here is the calling method. So now calling method is very, very simple. This door department to department, department is equal to this dot set Department. I created the Department for the random password. I will come back to here for the department that pulls random password. This password equals password, which I created. What I require here is passing arguments as what I told you. I am not mentioning length then because I want to put inside this awarding their part. I just put land here only. Length will be always not very ideal condition to put all this land. But for the simple condition as the aid. Or you can choose as much as you want, or you can do from six to 15, or something like that. Now, I want to combine these like denigrating men. That method. This dot generate, underscore image, I have commenting it out. This is for generation. We're done with this part. But this is just, there is no method. You cannot run this like this only because you can see there is no main method we created here. Vr meeting with a main method. So this is all about the email part. In the next part, what I'm going to show you, how we can create a main method. We're going to invoke it. That main method, including how we can use these all part. I'm going to show you how you can create and store that specific file, dot dx d Phi. So see you guys in the videos. 7. Creating main method to Run program: In the previous part, what we did is we created one class with some scanner method Robert strings, firstName, lastName, department, e-mail or the e-mail generation application, or if we can say email administration application inside this Ve created one constructor name as email. We created some methods or generic mail asking departments and then generate random passwords as you are seeing on the screen. This is very important matter like how we are using random plus here, if you remember, I have already mentioned in a previous class videos that in java dot util dot star, Java library random class exists user-defined, but it's a system defined, or we can say Java defined. Then set password. Here. This is also very important. And I can say for this very lengthy part of this, our project. So logic of the slides, how we wrote our logic is from the user. So it will ask for the password. For the current password actually, password matches. It will tell the user to change your old password to the new password. But if your current password does not match or is wrong, which is already stored in the system. It will throw some error saying that your current password entered is wrong and you are not the authorized person to change the password and you will be thrown out of the password change look for security reasons. So let's see how we can use this part, like how we can run this part. Before that, we're not running this part, but if you want to run this part, you need to create a main method. If you don't know what is main method is basically lied to execute any core. First the control goes over to the main method. The main method does not exist, then your code will not run. If you'd axes, then the core will start running from the main method. In order to run the code or any program, you need to include a main method within the same package or within the same Java class. So what is using object oriented programming? You can see the score is for email, I can just simply add main method at the bottom here. And I can invoke this. But this is not a very good practice as this code is already really lengthy. As you can see, now, what I can do or what you can think of, I can create another class within the same package in that I can create one object for this email, it will be very helpful to execute, also aren't very helpful to understand, including this, I can use that methods again and again. So this is very significant method in Java, but object-oriented design. Now, how we can create one another class is very simple as we created that email class now. Similarly like that, just go to this e-mail package, email app package, right-click here. It will give the options. Wait for a minute, Right-click here, this part, this should give you all the options. It will take time to load everything. Just right-click here, as you can see, a new option. I want to create Java class. Yeah, Java class. I'm giving the name as email app. As you can see, both are under the same package and our app is created or our class is created. This is the package email app and our app is created. So before proceeding with some code, I will import very important method import Java util. As you can see, this is very important library we already done with this library. Now in this, I am going to create a main method, which is basically public static, void main. Whenever I'm ready, whenever IT sees the main method, it will run the program. Again, I am going to create a standard ASC, or you can say as similar to that scanner in the email class, inside the brackets we write System.in. Yeah. Then after this, what I will do, I will ask for the user to enter their name. For that used system, dot out dot print LN. Within the double-quotes, write the string, enter first name. Then in the next line, write string name is equal to S dot next. So you can use the next line also here. Or you can use next year also. I am going to use next only nor the next line or something. Then again, system dot out dot print LN. And within the double-quotes, write the string. Enter, last name, last name. In the next line right here. Is equal to S dot. Next. That's it. We're done with this. Now I want to create some new employee. I want to generate new employees. So we already created this male, this e-mail. Now I want to invoke it in this class that e-mailed us. How can I do this? I will first write command here for understanding purpose only, like here, only user info like this. Writing one more command here, double slash, creating object for email class. Now use the Java lastname, email, where we wrote the code and the first now via writing as user-defined functions. So write it as e-mail, that e-mail Part one. Or I can say object one. I am going to equate it to here, like the M1 is equal to email. That's it. But remember before that, what I'm putting here is problem is this this constructor, firstName and lastName. That's why I'm asking the user to put their first name and last name. So I will pass two arguments here. Underscore name. Yes, underscore name. Now, there is no error in this part, so it will generate new firstName and lastName. But before that, if you remember, we created too many methods for generating new password and then ordinate male mailbox, the opacity. And we are going to go further also to see how we can proceed with this and the next line, what I will, I will write it twice. I'm assigning it to minus one. Now, I want to invoke it again and again. For this, I will use a do-while loop. Similarly like that, we created already system dot out, dot, print LN. Within the double-quotes. Write the string as slash n means in the next line, and then write star, star, star or something like this. End it with one more slash n, like this, right? Enter you would choice. Now, we will display options for the user in point-wise on a console. For that ended with a slash and we thought the space right, one dot Show Info. It will be displayed as a first option on the console of the user. And again, slash n, right, with our space light to dark password. This will be displayed as the option to on the console of the user. Similarly do this for the third option, also write slash n without the space three dots. Change. Mailbox, the opacity for the fourth option, slashing for mel, I want to create one exit method also. So let it be as a fifth option, five for exit. Now, insert this do-while loop in the next line, I am going to ask the user these five choices which we just created above. So for that right choice is equal to S dot next in. This is a integer bar next door next. Now we will switch gears. So follow along with me inside the bracket by twice, open the flower brackets or an insert. These are all the cases like this. Guess one, as we know, Case one is showing the info. So as you know, we created this variable. Now what I can do is just EN1 dark objects. We know the hour, we have the getting for that, but we know we have one method called get info we already created. So I am just using that method. After this, don't forget to put the break statement. Otherwise it will show the error. Then we will move to the next case, that is case two. Case two is password for that EN1 dark set password password method. And after this, don't forget to put the break statement. The next case, that is case three, gets three VM1 dot mail capacity. And again, don't forget to put the break statement. We'll move on to the next case. That is case four. Yes, four. What is this case for? Setting these guesses for setting alginate mill? So what are alternate male after this? Don't forget to put the break statement. Lastly, this time it is nothing but just what exiting bytes. So what I can do is guess five is display a message on the console using system dot out, dot. Ellen, inside the brackets, right is within the double-quotes. Thank you for using our application. And after this, I can write a break statement. Should be a one default condition here. Also, as you can see, it is a very good practice to create a default condition for that system. Dot out, dot, print LN inside the brackets, the right, this within the double-quotes as invalid choice, enter proper choice. Again. Before that, I will put here slashing to this invalid twice exclamation mark. So we are done with this. Now, I want to exit this part for exiting right? While the condition as toys, not equal to five for exiting the right while inside the brackets, pass the condition as toys not equal to phi, phi enter five as my toys. For example, it will exit that loop. So we're done with this part. So we can run this part. But thing is remaining without creating file and storing into that pile and executing one executable file and creating one executable file. So I'm going to show you what I'm going to run this part in a simple scenario running. You can go to this also, this all over the run option which is at the top of the page. As you can see, simple way. That is, you can see here the green arrow to run the part. So it will ask me to run the email app dot. It will run this email up. And as you can see, configuration, it will automatically detect the configuration. It will set the configuration. Now in this part, you can see all the billing processes here. This is the output and everything. So it is, our application is building. So it will take some time to compile then configuration than directories and checking all everything. So as you can see in this run configuration or app is successfully deployed, or I can say running. So this is very simpler. You can enhance it. So as you can see, this is the Run Configuration. Our app is successfully deployed, or I can say it running. So this is very simple. You can Anansi to more something like web app or something like that. But this is just the back-end of aura. I will enter my first name here, James and the last name as B. James to be only new employees. James be no, What is your department? I am setting it to the sales department. So enter one as option. Now, I want to show is info. Enter one as the option. And as you can see, is info is James B dot company. As I told you, James, the name is James B. Password. Is this, as you can see, some combination and you can see the size of the mill capacities, 500 MB, the printing and email here. So in a further part, I will show you how you can modify this also. This is just, I'm sure about how we can run our code. Just I will stop this process here. So let us see how we can move further. I just created one simple scenario here. So I just created one simple scenario here. Let us add some this also because there is some mistakes here also. Then new employee also. Let us add some this also because there is some mistakes. Year also e-mail sad, then new employee. Also. There is one mistake that there is no gap between to this. So this will help. So now let's run the method again. So as you can see, this is very back-end. This is very primary. But here what we understood that, how we can create object oriented design, how we can collect system before methods using random. Now enter FirstName, LastName as James B, or anything you want. Now, it's asking for these four options. So now let's choose Accounting Department here so that enter three. Now, for this recording department, you can see all the informations of James B person which is generated now we are given via options. So let us see how we can use and password here. So for that enter to as the change password option, they are asking if we want to change the password. So SV2, we do want to change the password. So let's enter vibe. Now, it is checking if I'm authorized person to change the password. For that, we need to enter the old password or the current password. Now, the system is very smart. It hasn't been already stored your current password, so it will check if your password matches the current password. Currently, I'm copy-pasting this part only because I want I don't want to waste my time on that. So if the current password so if the current password or the old password is correct, then only it allows you to change the password or else it will throw you out of the loop now as we have entered the current password correctly. So now it is allowing me to change new password. That is telling me to enter a new password. So I will enter 123 paths as my new password. Once you have done with this, it will, as you can see, this message says password as senior successfully. Now, if you want to check if the new password has been updated or not, Let's check by displaying the info for that enter one as your option. You can see 123 paths is my new password. And the password has been updated in the system. Now, if you want to set an alternate male for the Jim's be person, you can set alternate male by entering option for. Now. As you can see, it's asking me to enter new alternate Mill. Let's put alternate male as be at gmail.com. If I'm putting that, you can see alternate male is set. You can set everything. Let's change the mill capacity also. I am, I am putting here as thousand MB. Know the mill capacity is changer again from 502 thousand. You can see 1 thousand MB here. So we created this. So this is the back-end part of a project. So in the next video, let us see the final execution of our project. 8. Final execution of project: So in the previous video, we learned how we can create a main method and how we can run. And further, I'm going to explain how we can store this information into one file. So let us see. First, I'm commenting it out for understanding purpose only. So double slash storing file. I am going to hear specify access modifier as public. And let's eat return type BY and give the name of the method as store file, store file method. This is just a method. Now I'm going to use your file right here. For that I already used are imported this library, java.io. This is very important library for FileWriter method. So before FileWriter method, you should draw the user-defined exception. For that purpose, I'm going to use your try-catch block. It's very simple, user-defined exception matters, or we can say it is not very user-defined. We can say it is one of the most user error handling methods. To use try catch block. You need to follow the syntax. In the try block, you need to write error lines of code. And in the catch block, you need to write what exception you need to display on the console to understand for the user. So in the catch block, right along with me within the bracket, right, exception e, I open the flower brackets and write system dot out, dot, print LN. E inside the brackets. Here is nothing but error handling. So let us see inside this try block how we can create FileWriter. So right along with me as file writer and name a variable as in. In is equal to new file writer. Open and close the brackets. Here, you have to specify basically location of the file. Or you can say that input. If you're not giving their part, you can just put Pi limb here. But it will create in a system default. But in my case, I'm going to use here desktop location file, which I already created. So basically go to our desktop, create a new text file. Once you have created a new file, right-click on it. Go to the properties and floppy, the location of the file as shown in the video. Basically in the ID. As I am bringing the video at the end of it, make sure to give the file name, which you have specified. In my case, I have mentioned or name the file as for dot TXT. So I am writing it as input.txt at the end. Always remember you should give the full path of the input.txt while you are giving the different bile, whether you are going to use the same violin, same project, or you are going to create, or you can just load that file name. After that, I want to put that part introduced in Dar, right? What I am going to write here that is inside the brackets is firstName string within the double-quotes, plus this dot F name, firstname. Similarly, I am putting your FirstName here than in dog. I am not going to write it again. I'm going to append it. So I am going to append it here like this in dot append inside the brackets, the right, the string as lastName within the double-quotes. Okay, you can put your slashing now, right, plus this dot name, last name, again in Dart. Append. Similarly, I am going to put everything here now or email everything. So similarly like this, like that, you can put everything right. E-mail within the double-quotes plus this door e-mail, that is for email. Then in the next line, again, we will write for the password. So write it as dark indoor append inside the brackets slash and password. Ideally, you should not store any password, but I'm considering this as our database. So next, right, plus this dot password. Then in the next line, again, we will write for men capacity. So we write it as in dot append inside the brackets slashing the opacity. So next, write as plus this dark milk the opacity. Then in the next slide, again, we will write for alternate male. Write it as in dot append inside the brackets slashing alternate male. Next, write plus this dot underscore email. Now I'm going to close this. Always remember, this is the best practice to close everything for that. Write it as in dog loose. I am just printing system dot out, dot, print LN. Inside the brackets, write it as datastore. This will be displayed when the user enters five as the option, and that's it. Now, this code we wrote just now is for storing only. We need to create or reading part also. So I am writing comments like reading file method. Now I am making access modifier as public and let the return type be wide. Now, let the name of the method be read underscore file. Similarly, you are going to use try-catch block here also for exception handling. In gas law, pass the arguments as exception e. Inside the catch block. Write system dot out, dot, print LN inside the brackets, pass ie. Now inside the try block, you are going to handle it by including airlines of the code. Here, I'm going to use FileReader method, which is part of the java dot IO library. You can use input stream also here, these are very efficient thing here, the output stream, input stream, this will serialize it and de-serialize z. These are very helpful burden due to time constraints and also there is no need to put everything here. I'm just going to use this right along with me as FileReader. F1 is equal to new FileReader. So filename, as we mentioned previously, I am going to copy this part and just paste it inside the brackets as shown in the video. And then just, I am creating an integer because it will look through the data center and diet. So it is very difficult to understand, but it is very helpful for small, small parts. In the next line, right, while loop. Inside this, right, I equal to your F1 dot read. There is some default thing that what is their part not equal to minus one, which is basically not know what it will do. It will print system dot out, dot, print LN on the console. What it will print bird. Inside it. It will print the character string because it will access that in what we can say in the integer part, but I want to print it as a character. So it will ask for character. Once this is done, I'm going to close it by writing F1 dot close here, connection is closed and this part is done. And this part is done. If you want, you can put here one system dot out, dot print LN just to give the gap. Just to give the gap. Now, we're done with this, but we haven't created anything in that e-mail main part. Okay. So as you know for this, I want, I will extend that part so as 15 is exerted. But now I am changing that fifth part to store data file, to store data in file. Now, the sixth option is for displaying data from file. And lastly, not the seventh part is for exit. Similarly, we are going to change this in this part also. So for the fifth part is as it is, but I'm going to change this statement toward to store the data. For that, write as E m1 dot store file. Our next line break statement is already present, so I'm leaving it. So moving on to the next case, that is case six, ES6. Write it as E m1 dot underscore file. The next line. Break statement again. And for the last case, that is case seven, it is for exit. So we have to display a message on the console using system dot out, dot print LN. Inside this, right, the message as, the message as. Thank you for using our application. Then again are the break statement. Now we are going to end this condition also in while loop inside the brackets, change the condition from five to seven because seven is the exit part. So now we're done with our project part. Let us run this part and I will explain you how to create some JAR file here with a Java archive file. So let's run this part. Click on Run. So it will ask for the FirstName. We will give us James and enter the last name as the B. So as you can see, new employee name is James B. Now let us pass one, but the sales department pass one and press Enter. Now, as you can see, each time this password is different and it is not taking numbers now. You can see it is just putting some random variables and everything and one number. Now, as we are there to more options recently, it's showing here also. Now, let us choose the option to store data into the file, that is option five. So we will pass five and press Enter. As you can see, it is stored into the file. Now, let's choose the option to display data from file, that is options six. So we will pass six and press Enter. You can see now this is printing this data. Now you will understand why this is printing like this all in a new line. So this means we have made a small mistakes and we need to change something here. We will understand what we read mistake here as this is done. But before that, in the choice, wait a minute. In the store file, I am printing this sprint challenge statement, which is empty. This is the reason for such output. So you can remove this part and also just to remove the slash n. Also like this because it will print output on a new line. So it is very difficult to understand. So always, never give the slash. And in this part now I will run it again and I will show you this is all about our application. So it will ask for the FirstName and we will get dams and enter the last name as B. So as you can see, the employee name is James B. Now, let's pass one for the sales department. Now, as we added two more options recently, it is showing here. Now, let's choose the option to store data into the file, that is option five. So we will pass by and press Enter. As you can see, it is stored into the file. Now, let's choose the option to display data from the file, that is options six. So we will pass six and press Enter. You can see our data is displayed. Now let us see, wait a minute, again, we have made one small mistake. So here, instead of print LN, just write it as print. And also use slash N here to avoid that. To avoid that lashing, lashing, a slashing and slashing. Now, we are done with this. Now. Let us run it again. Now we debug our problem. As you can see, it's printing character by character because of the print LN statement. Now I am going with a print statement, so it will ask for the FirstName. We will give it as James and enter the last name as B. So as you can see, the employee name is James V. Now, let us now let us pass one for the sales department. Now, as we added two more options recently, it's showing here. Now, let's choose the option to store data into the file, that is option five. So we've been passed five and press Enter. As you can see, it is stored into the file. Now, let us choose the option to display data from the file, that is option six. So we will pass six and press Enter. So as you can see, it is displaying the data capacity and everything very properly. So now we're done with our project, but let us see how we can create one single file or we can say some single JAR file. For executing this part. We are already done with our project. As I told you, we are going to create one single executing file with our projects. So for that purpose, Corporate this file option at the top, click on the project structure. Click on the project structure. For this purpose, go to this file option at the very top. As you can see, click on the project structure bar as shown in the video, one new window opens, as you can see in the video. Now, by default, project section will be selected. Now, we need to go to the artifacts section here. So click on the artifacts. Once you have liquid artifact or the top, as you can see, there is a plus symbol, which means r, which means our click on Add button here. Now you will be shown few options to select. For this, we will select data, which is the first option. Click on John. Again. It will show you like this. Now, we want to create with dependencies. For that, click on the last option that is from modules with dependencies. Now, it will open a new small window like this. As you can see on the screen. Name is email application by default. You don't have to change it. Now. Below it, there is a main class. By default, it will be empty. So here we need to tell IDE that to select the main class, which means where we have written public static void. We have written it in the new Java class and we have given the name as email app. Now, email app contains main method from which the code runs or the cord starts turning. So we need to browse it and tell the id the location of it. For that, click on browse. What new window will be opened like this? It will automatically detect the main method Java class file. Here, as you can see, detector here, that is email app, but if it does not detected automatically, you can click on Project here and click on external symbol here. As you can see, our project files, make sure to select the file where main method is written. If you'll follow me, we have written main method in email app file. We are going to select it and click on, Okay. Once it is okay, click again, okay. Now all these settings are system default. Do not try to change anything here. Then click Apply. And lastly, click on OK. So Now the artifact is loaded, but we want to build it. So go to the Build here and click on this Build Artifacts option. It will give you options here like Bill Ward, clean or eat something. So we need to build. It will take time to build. So click on the Build. So it will take time. As you can see, the dialog box here. Bottom, it is building this and it is doing so. It will take some time to build. As per our project requirements. Our project requirements are very less in this. So now you can see in the out and artifacts, you can see this email application dot jars. So if you want to run this part, you have to read the configuration. So go to this tab here. I did configuration part here at the top. You will see this dialog box. Click Add New button here. Then there is a huge list for this. So go to there down here, insert this. You can have to identify this data application. Data application. Click on Enter. You can give the name and then the name as email app local machine, you have to do the jar path here. So in this jar path is always in our artifacts and this you can see jar but click Enter, click on Apply. Now, you can run this email up pad. As you can see, this is printing this everything. So our JAR file is running properly. Now we know we're running with a JAR file. Let us see how we can run in command prompt itself. So I'm going to pause this part. I'll stop this part. And I will show you how we can do this in the command prompt. Let's first open the command prompt here, Java slash jar, and then that name of your jar file. So you can see this is running. I'm again putting this James B. Then as development says, info, as you can see, info is printing. Similarly like that. You can create one application. This is very basic application we're going to use. But you can move further that any part, like you can create a Java effects or GUI for this hour at anything. So this was all about our project java email application. I hope you have learned many things from this.