?? changetitle.java
字號(hào):
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
public class ChangeTitle extends JFrame implements ActionListener {
JButton b1 = new JButton("Rosencrantz");
JButton b2 = new JButton("Guildenstern");
public ChangeTitle() {
super("Title Bar");
b1.addActionListener(this);
b2.addActionListener(this);
JPanel pane = new JPanel();
pane.add(b1);
pane.add(b2);
setContentPane(pane);
}
public static void main(String[] arguments) {
JFrame frame = new ChangeTitle();
ExitWindow exit = new ExitWindow();
frame.addWindowListener(exit);
frame.pack();
frame.setVisible(true);
}
public void actionPerformed(ActionEvent evt) {
Object source = evt.getSource();
if (source == b1)
setTitle("Rosencrantz");
else if (source == b2)
setTitle("Guildenstern");
repaint();
}
}
class ExitWindow extends WindowAdapter {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}
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