撒比

package button;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
@SuppressWarnings("serial")
public class ButtonFrame extends JFrame{
private JPanel buttonPanel;
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULT_HEDITH = 200;
public ButtonFrame(){
setSize(DEFAULT_WIDTH, DEFAULT_HEDITH);
JButton yellowButton = new JButton("Yellow");
JButton blueButton = new JButton("Blue");
JButton redButton = new JButton("Red");
buttonPanel = new JPanel();
buttonPanel.add(yellowButton);
buttonPanel.add(blueButton);
buttonPanel.add(redButton);
add(buttonPanel);
ColorAction yellowAction = new ColorAction(Color.yellow);
ColorAction blueAction = new ColorAction(Color.blue);
ColorAction redAction = new ColorAction(Color.red);
yellowButton.addActionListener(yellowAction);
blueButton.addActionListener(blueAction);
redButton.addActionListener(redAction);
}
private class ColorAction implements ActionListener{
private Color backgroundColor;
public ColorAction(Color c){
backgroundColor = c;
}
public void actionPerformed(ActionEvent event){
buttonPanel.setBackground(backgroundColor);
}
}
}