import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.List;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingWorker;
public class SwingWorkerDemo {
public static void main(String[] args) {
JTextArea textArea = new JTextArea(10, 20);
final JProgressBar progressBar = new JProgressBar(0, 10);
final CounterTask task = new CounterTask();
task.addPropertyChangeListener(new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent evt) {
if ("progress".equals(evt.getPropertyName())) {
progressBar.setValue((Integer) evt.getNewValue());
}
}
});
JButton startButton = new JButton("Start");
startButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
task.execute();
}
});
JButton cancelButton = new JButton("Cancel");
cancelButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
task.cancel(true);
}
});
JPanel buttonPanel = new JPanel();
buttonPanel.add(startButton);
buttonPanel.add(cancelButton);
JPanel cp = new JPanel();
LayoutManager layout = new BoxLayout(cp, BoxLayout.Y_AXIS);
cp.setLayout(layout);
cp.add(buttonPanel);
cp.add(new JScrollPane(textArea));
cp.add(progressBar);
JFrame frame = new JFrame("SwingWorker Demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setContentPane(cp);
frame.pack();
frame.setVisible(true);
}
}
class CounterTask extends SwingWorker<Integer, Integer> {
private static final int DELAY = 1000;
public CounterTask() {
}
@Override
protected Integer doInBackground() throws Exception {
int i = 0;
int count = 10;
while (!isCancelled() && i < count) {
i++;
publish(new Integer[] { i });
setProgress(count * i / count);
Thread.sleep(DELAY);
}
return count;
}
protected void process(List<Integer> chunks) {
for (int i : chunks)
System.out.println(i);
}
@Override
protected void done() {
if (isCancelled())
System.out.println("Cancelled !");
else
System.out.println("Done !");
}
}
