import java.awt.*; import java.awt.event.*; import javax.swing.*; public class ButtonFrame extends JFrame implements ActionListener{//窗口直接實現了監聽接口，整個窗口做監聽器private static final long serialVersionUID = 1L;private JPanel buttonPanel;private static final int DEFAULT_WIDTH = 300;private static final int DEFAULT_HEIGHT = 200;JButton yellowButton ,blueButton,redButton;public ButtonFrame(){ setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);// 創建按鈕對象yellowButton = new JButton("Yellow");blueButton = new JButton("Blue");redButton = new JButton("Red");buttonPanel = new JPanel();// 添加按鈕到畫板buttonPanel.add(yellowButton);buttonPanel.add(blueButton);buttonPanel.add(redButton); add(buttonPanel);// 為每個按鈕設置監聽器，這里要用this，表示窗口本身yellowButton.addActionListener(this);blueButton.addActionListener(this);redButton.addActionListener(this);}@Overridepublic void actionPerformed(ActionEvent e) {// //窗口做監聽器，要使用e.getSource()方法判斷觸發事件的事件源if(e.getSource()==yellowButton)buttonPanel.setBackground(Color.YELLOW);if(e.getSource()==blueButton)buttonPanel.setBackground(Color.BLUE);if(e.getSource()==redButton)buttonPanel.setBackground(Color.RED); } }

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