SwingWorkerDemo.java Source code

Introduction

Here is the source code for SwingWorkerDemo.java

Source

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 !");
    }
}