eventsample3.java

java入门经典教程 java入门经典教程 java入门经典教程

// 例6.2.3 EventSample3.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class EventSample3 implements ActionListener
{
    private static JFrame frame;
	private static JPanel pl;
	private JButton btn1,btn2;    	
	public EventSample3()
{
        frame = new JFrame("事件演示窗口");
		pl = new JPanel();
        btn1 = new JButton("按我可以听到声音");
        btn2 = new JButton("按我弹出信息对话框");
        btn1.addActionListener(this);
        btn2.addActionListener(this);
		pl.add(btn1);pl.add(btn2);
        frame.getContentPane().add(pl);
        frame.setSize(350,100);
		frame.setVisible(true);
        frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
    }
   	public void actionPerformed(ActionEvent e)
{
		if(e.getSource() == btn1)           //getSource判断哪个按钮被按下了
			Toolkit.getDefaultToolkit().beep();
		if(e.getSource()==btn2)
			JOptionPane.showMessageDialog(frame,"欢迎学习事件处理！"); 
	}
	public static void main(String[] args)
{
		new EventSample3();
	}
}