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.");
  }
}