To display the percentage completed [100 X (value-minimum)/(maximum-minimum)], call the
public void setStringPainted(boolean newValue) method with a parameter of true.
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
public class ProgressBarStep {
static class BarThread extends Thread {
private static int DELAY = 500;
JProgressBar progressBar;
public BarThread(JProgressBar bar) {
progressBar = bar;
}
public void run() {
int minimum = progressBar.getMinimum();
int maximum = progressBar.getMaximum();
for (int i = minimum; i < maximum; i++) {
try {
int value = progressBar.getValue();
progressBar.setValue(value + 1);
Thread.sleep(DELAY);
} catch (InterruptedException ignoredException) {
}
}
}
}
public static void main(String args[]) {
JFrame frame = new JFrame("Stepping Progress");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JProgressBar aJProgressBar = new JProgressBar(0, 50);
aJProgressBar.setStringPainted(true);
final JButton aJButton = new JButton("Start");
ActionListener actionListener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
aJButton.setEnabled(false);
Thread stepper = new BarThread(aJProgressBar);
stepper.start();
}
};
aJButton.addActionListener(actionListener);
frame.add(aJProgressBar, BorderLayout.NORTH);
frame.add(aJButton, BorderLayout.SOUTH);
frame.setSize(300, 200);
frame.setVisible(true);
}
}