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| 按钮行动来改变面板的背景 |
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import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class ButtonSettingBackground extends JPanel implements ActionListener {
private JButton yellowButton = new JButton("Yellow");
private JButton blueButton = new JButton("Blue");
private JButton redButton = new JButton("Red");
public ButtonSettingBackground() {
add(yellowButton);
add(blueButton);
add(redButton);
yellowButton.addActionListener(this);
blueButton.addActionListener(this);
redButton.addActionListener(this);
}
public void actionPerformed(ActionEvent evt) {
Object source = evt.getSource();
Color color = getBackground();
if (source == yellowButton)
color = Color.yellow;
else if (source == blueButton)
color = Color.blue;
else if (source == redButton)
color = Color.red;
setBackground(color);
repaint();
}
public static void main(String[] args) {
JFrame frame = new JFrame("ButtonTest");
frame.setSize(300, 200);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Container contentPane = frame.getContentPane();
contentPane.add(new ButtonSettingBackground());
frame.show();
}
}
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