here is a step-by-step tutorial for creating a "Hello, World!" application in Java Swing using a text editor.

Step 1: Install JDK

Before you begin, make sure you have the latest version of the Java Development Kit (JDK) installed on your computer. You can download the JDK from the Oracle website.

Step 2: Create a new Java source file

Open your favorite text editor and create a new file named "HelloWorld.java". In this file, you will write the code for your "Hello, World!" application.

Step 3: Write the code for the application

Open the "HelloWorld.java" file in your text editor and write the following code:

import javax.swing.*;

public class HelloWorld {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Hello, World!");
        JLabel label = new JLabel("Hello, World!", SwingConstants.CENTER);
        frame.getContentPane().add(label);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 300);
        frame.setVisible(true);
    }
}

This code creates a new JFrame object and adds a JLabel object to it. The JLabel object displays the text "Hello, World!" in the center of the frame.

Step 4: Save the source file

Save the "HelloWorld.java" file in a directory of your choice. Make sure the file has a .java extension.

Step 5: Compile the source file

Open a command prompt or terminal window and navigate to the directory where you saved the "HelloWorld.java" file. Then, type the following command to compile the source file:

javac HelloWorld.java

This command will compile the source file and generate a bytecode file named "HelloWorld.class".

Step 6: Run the application

To run the application, type the following command in the same directory:

java HelloWorld

This command will execute the bytecode and display the "Hello, World!" window.

Congratulations! You have just created your first Java Swing application.