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import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class InvokeExample {
private static JButton good = new JButton("Good");
private static JButton bad = new JButton("Bad");
private static JButton bad2 = new JButton("Bad2");
private static JLabel resultLabel = new JLabel("Ready", JLabel.CENTER);
public static void main(String[] args) {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel p = new JPanel();
p.add(good);
p.add(bad);
p.add(bad2);
Container c = f.getContentPane();
c.setLayout(new BorderLayout());
c.add(p, BorderLayout.CENTER);
c.add(resultLabel, BorderLayout.SOUTH);
good.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
resultLabel.setText("Working . . .");
setEnabled(false);
Thread worker = new Thread() {
public void run() {
try {
Thread.sleep(5000);
} catch (InterruptedException ex) {
}
SwingUtilities.invokeLater(new Runnable() {
public void run() {
resultLabel.setText("Ready");
setEnabled(true);
}
});
}
};
worker.start();
}
});
bad.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
resultLabel.setText("Working . . .");
setEnabled(false);
try {
Thread.sleep(5000);
} catch (InterruptedException ex) {
}
resultLabel.setText("Ready");
setEnabled(true);
}
});
bad2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
resultLabel.setText("Working . . . ");
setEnabled(false);
SwingUtilities.invokeLater(new Runnable() {
public void run() {
try {
Thread.sleep(5000); // Dispatch thread is starving!
} catch (InterruptedException ex) {
}
resultLabel.setText("Ready");
setEnabled(true);
}
});
}
});
f.setSize(300, 100);
f.setVisible(true);
}
// Allows us to turn the buttons on or off while we work.
static void setEnabled(boolean b) {
good.setEnabled(b);
bad.setEnabled(b);
bad2.setEnabled(b);
}
}
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