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Creating First Java Application in IntelliJ IDEA

  • Difficulty Level : Expert
  • Last Updated : 28 Jan, 2021

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, selectsrc → 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.




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