Develop a Java program that creates a GUI application with a button. Whenthe button is clicked, it should change the text of a label.

Here’s a simple Java program that creates a GUI application with a button. When the button is clicked, it changes the text of a label.

Java GUI Program

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class SimpleGuiApp {
    public static void main(String[] args) {
        // Create a new frame
        JFrame frame = new JFrame("Simple GUI Application");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 200);
        
        // Create a label
        JLabel label = new JLabel("Initial Text");
        label.setHorizontalAlignment(SwingConstants.CENTER);
        
        // Create a button
        JButton button = new JButton("Click Me");
        
        // Add action listener to the button
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                label.setText("Text Changed!");
            }
        });

        // Add components to the frame
        frame.getContentPane().add(label, "North");
        frame.getContentPane().add(button, "South");
        
        // Set the frame visibility to true
        frame.setVisible(true);
    }
}

How to Run the Program

1. Make sure you have Java Development Kit (JDK) installed on your computer.
2. Copy the code into a text editor or IDE (like Eclipse or IntelliJ IDEA) and save it as SimpleGuiApp.java.
3. Open a command prompt or terminal, navigate to the directory where the file is saved, and compile the program using:

   javac SimpleGuiApp.java
   

4. Run the compiled program with:

   java SimpleGuiApp
   

Operation

When you run the program, a window will open displaying a button and a label. Clicking the button will change the text of the label from "Initial Text" to "Text Changed!"