Creating First Java Application in IntelliJ IDEA

IntelliJ IDEA is a Java IDE that is one of the 3 biggest and most popular IDE’s in the world. It has two versions, namely the free open-source community edition and a paid Ultimate edition. Some features of IntelliJ IDEA are as follows:

• Both versions of IntelliJ IDEA support various programming languages like Java, Scala, Kotlin, Groovy, etc.
• There are many features in IntelliJ IDEA that make programming simpler such as debugging, code completion, code inspections, XML editing support, code refactoring, unit testing, TestNG, etc.
• Some other tools that are only offered in the paid Ultimate version duplicate detection, JavaScript and database tools, Perforce integration, etc.
• IntelliJ IDEA can be used on platforms like Linux, macOS, and Windows

Procedure:

1. Start a project
2. Create a package inside the project and corresponding classes to the package created
3. Write the code to be executed in a text editor
4. Package the above project in JAR
5. Test the application
6. Execute the above JAR file

Implementation: 

Step 1: Start a project

• When you open IntelliJ for the first time you will get a welcome screen with three options. Out of those three options click on the new project to get started.
• In the next window, you have to give the name of your project
  • “GeeksForGeeks” is a custom input used to illustrate here in the article.
• If you want to use an additional library or any kind of template then you have an option to choose from the dropdown menu that will ease your task.
• After clicking finish your IDE will create a virtual environment for your project.

• Name the project as ‘GeeksForGeeks’ (you can choose any name), and then clicks finish.

Step 2: Create a package inside the project and corresponding classes to the package created

• On the left-hand side of the project window, select ‘src → new → java class → write ‘GeeksForGeeks.gfg’ ‘
• It will create a project named ‘GeeksForGeeks’ and create a class of ‘GeeksforGeeks’.

Step 3: Write the code to be executed in a text editor

Writing a demo program in the text editor that should only print “This is my first project in java” after the program is successfully compiled and run.

Example

Java

// Java demo program to print message on the console

// Importing input output classes
import java.io.*;

// Class
public class Geeksforgeeks {

    // Main driver method
    public static void main(String[] args)
    {
        // Print and display on the console after
        // successful compilation and execution
        System.out.println(
            "This is my first project in java");
    }
}

• After writing the above code you may check if it is finishing with exit code ‘0’ or not.

Step 4: Package the above project in JAR

• After you have finished with the writing part you can now package your application in a JAR file.
• Select file → project Structure → artifact

• Click on the addition sign(+) as you can see in the following image.

• Select the folder icon that is present in the left of the output directory field and define the path to the .jar file.
• Now go to build in the navigation bar and select ‘build artifacts‘ from the drop-down list.

Step 5 -NOW TEST YOUR APPLICATION

• Now select Edit configuration from the field present on the right-hand side as shown below, highlighted with a yellow box.

• Now click on the addition sign(+) and select the JAR application from the menu. In the name field write ‘GeeksForGeeksJar‘.
• Choose the ‘GeeksForGeeks.jar’ file from the directories.

• In the path to jar field, click the folder sign and specify the path of your .jar file.
• Click on the plus sign(+) in the before launch field and then select build artifacts from the given options.

• Select GeeksForGeeks: jar from the menu and press OK.

Step 6: Execute the above JAR file

• Select GeeksForGeeks.jar from the toolbar in the top right corner of your IDE and run.
• If the process executed successfully, it means that your application is packaged correctly and you are done with creating your first java application in IntelliJ IDEA.