?? listenerimplementframe.java
字號:
package listener;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
//對類引用ActionListener動作接收器
public class ListenerImplementFrame extends JFrame implements ActionListener {
JPanel contentPane;
JButton jButton1 = new JButton();
JButton jButton2 = new JButton();
JButton jButton3 = new JButton();
public ListenerImplementFrame() {
try {
setDefaultCloseOperation(EXIT_ON_CLOSE);
jbInit();
}
catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
ListenerImplementFrame frame = new ListenerImplementFrame();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize = frame.getSize();
//居中對齊
frame.setLocation((screenSize.width - frameSize.width) / 2,
(screenSize.height - frameSize.height) / 2);
frame.setVisible(true);
}
private void jbInit() throws Exception {
contentPane = (JPanel) this.getContentPane();
contentPane.setLayout(null);
this.setSize(new Dimension(400, 300));
this.setTitle("對類引用事件接收器示例");
jButton1.setText("按鈕1");
jButton1.setBounds(new Rectangle(120, 50, 160, 40));
jButton2.setText("按鈕2");
jButton2.setBounds(new Rectangle(120, 100, 160, 40));
jButton3.setText("按鈕3");
jButton3.setBounds(new Rectangle(120, 150, 160, 40));
//分別為3個按鈕加入動作接收器
jButton1.addActionListener(this);
jButton2.addActionListener(this);
jButton3.addActionListener(this);
contentPane.add(jButton1, null);
contentPane.add(jButton2, null);
contentPane.add(jButton3, null);
}
//重載動作接收器的方法
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null,( (JButton) e.getSource()).getText()
+ "被單擊.");
}
}
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