JProgressBar in Java Swing

In Java, a JProgressBar is a graphical component that displays the progress of a task. It’s commonly used to show the advancement of tasks like file downloads, data processing, or any operation that takes time to complete.

Following a basic example of how to use the JProgressBar component:

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
import javax.swing.SwingUtilities;
import javax.swing.Timer;

public class JProgressBarDemo extends JFrame {
	private JProgressBar progressBar;
	private JButton startButton;
	private Timer timer;
	private int progressValue = 0;

	public JProgressBarDemo() {
		setTitle("JProgressBar Demo");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setLayout(new FlowLayout());

		progressBar = new JProgressBar(0, 100);
		progressBar.setPreferredSize(new Dimension(300, 30));
		add(progressBar);

		startButton = new JButton("Start");
		add(startButton);

		startButton.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				startButton.setEnabled(false); // Disable the button during progress
				timer.start(); // Start the timer to update the progress
			}
		});

		timer = new Timer(100, new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				if (progressValue < 100) {
					progressValue++;
					progressBar.setValue(progressValue);
				} else {
					timer.stop(); // Stop the timer when progress reaches 100
					startButton.setEnabled(true); // Re-enable the button
					progressValue = 0; // Reset progress for future use
				}
			}
		});

		pack();
		setLocationRelativeTo(null); // Center the window
	}

	public static void main(String[] args) {
		SwingUtilities.invokeLater(new Runnable() {
			@Override
			public void run() {
				new JProgressBarDemo().setVisible(true);
			}
		});
	}

}

Output: