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How to use JProgressBar in Java using Swing Framework API ?.


Program to demonstrate working of JProgressBar in Java using Swing API

package com.hubberspot.swing.code;

import javax.swing.*;

public class ProgressBarDemo extends JPanel {

	// 1. Create a instance variable of JProgressBar
	JProgressBar progressBar;

	// 2. Constructor call to ProgressBarDemo will 
	// create a object of JProgressBar and set 
	// minimum and maximum value of progress bar 
	// to 0 and 100
	public ProgressBarDemo() {

		progressBar = new JProgressBar();
		progressBar.setMinimum(0);
		progressBar.setMaximum(100);

		// 3. Add Progress bar to Panel 
		add(progressBar);

	}

	// 4. progress method will update the value of 
	// progress bar every 100 ms after executing 
	// sleep method
	public void progress(int value) {

		progressBar.setValue(value);

	}

	public static void main(String args[]) {

		// 5. Create a object of customized JPanel
		final ProgressBarDemo progressBarDemo = new ProgressBarDemo();

		// 6. Create a Object of JFrame and setting title as 
		// "Progress Bar Demo"
		JFrame frame = new JFrame("Progress Bar Demo");

		//	Give frame a size in pixels as say 300,300 
		frame.setSize(200, 100);


		// 7. set a operation when a user close the frame, here it 
		// closes the frame and exits the application
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   

		// 8. Setting the Content Pane as ProgressBarDemo
		frame.setContentPane(progressBarDemo);

		// 9. Packing all the components together
		frame.pack();

		// 10. after setting contentPane, we make it 
		// visible on the frame by calling the method as 
		// setVisible and passing value as true.
		frame.setVisible(true);

		// 11. Having for loop which will loop from 0 to 100
		// it will invoke a dedicated thread to Swing Component
		// "JProgressBar" and on each loop will update the value
		// of JProgressBar by 1. It will accomplish this by calling 
		// progressBarDemo.progress method and pass the updated or
		// completed status to it.
		for (int i = 0; i <= 100; i++) {
			final int updateCompleted = i;
			try {
				SwingUtilities.invokeLater(new Runnable() {
					public void run() {
						progressBarDemo.progress(updateCompleted);
					}
				});
				// 12. Giving each loop a pause of 100 ms and 
				// updating JProgressBar meter by 1.
				Thread.sleep(100);
			} catch (InterruptedException e) {;}
		} 
	}
}


Output of the program : 




 
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