JProgressBar in Java Swing

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Progress bars are components used when long taks are performed to show the user how much time is left before the taks is compelete. The progress of the task can be represented numerically. Progress bars are created by specifying minimum and maximum values. These values represent the points at which the task begins and ends. Progress bars also provide proof that the program is still running and has not crashed.

/* =========================================================== File Name : JProgressBarDemo.java WebSite : http://javaproglang.blogspot.in/ Facebook : https://www.facebook.com/AdvanceJavaProgramming Created By : Bintu Chaudhary =========================================================== */ import javax.swing.*; import javax.swing.event.*; import java.awt.*; import java.awt.event.*; public class JProgressBarDemo extends JPanel { static ProgressThread progressThread; static JProgressBar progressBar; static JFrame myFrame; public JProgressBarDemo() { setLayout(new BorderLayout()); progressBar = new JProgressBar(); add(progressBar,"Center"); JPanel buttonPanel = new JPanel(); JButton startButton = new JButton("Start"); buttonPanel.add(startButton); startButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { startRunning(); } } ); JButton stopButton = new JButton("Stop"); buttonPanel.add(stopButton); stopButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { stopRunning(); } } ); add(buttonPanel, BorderLayout.SOUTH); } public void startRunning() { if(progressThread == null || !progressThread.isAlive()) { progressThread = new ProgressThread(progressBar); progressThread.start(); } } public void stopRunning() { progressThread.setStop(true); } public static void main(String args[]) { myFrame = new JFrame("Hello World!"); JProgressBarDemo progressExample = new JProgressBarDemo(); myFrame.getContentPane().add("Center", progressExample); myFrame.setSize(200, 100); myFrame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); myFrame.setVisible(true); } } class ProgressThread extends Thread { JProgressBar progressBar; boolean stopStatus = false; boolean aliveStatus = false; public ProgressThread(JProgressBar progressBar) { this.progressBar = progressBar; } public void setStop(boolean value) { stopStatus = value; } public void run() { int min = 0; int max = 50; progressBar.setMinimum(min); progressBar.setMaximum(max); progressBar.setValue(min); for (int x=min; x<=max; x++) { if (stopStatus) { break; } else { progressBar.setValue(x); try { Thread.sleep(100); } catch (InterruptedException e) { //Ignore Exceptions } } } aliveStatus = false; } }

C:\>jdk1.4\bin>javac JProgressBarDemo.java
C:\>jdk1.4\bin>java JProgressBarDemo

"Output of JProgressBarDemo.class"

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Java Swing-II

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