mybuttonactionevent.java

java课程的资料以及实验的代码

import java.awt.*;
import java.*;
import java.awt.event.*;

 class MyButton extends Panel implements ActionListener
{
   private Button b1,b2;
   String msg;
   public MyButton()
   {
     //设置字体名称、字型和字号
     setFont(new Font("Arial",Font.BOLD,16));
     //设置背景色和背景色
     setBackground(Color.cyan);
     setForeground(Color.black);
     //设置带有按钮"标签"的按钮
     b1=new Button("Demo Button 1");
     b2=new Button("Demo Button 2");
     //向按钮添加actionlistener
     b1.addActionListener(this);
     b2.addActionListener(this);
     //向容器添加按钮
     add(b1);
     add(b2);
    }

    public void actionPerformed(ActionEvent e)
    {
      msg="You have selected:"+e.getActionCommand();
      repaint();
    }

    public void paint(Graphics g)
    {
      g.drawString(msg,20,150); 
    }
    public static void main(String[] args)
    {
    	Frame frm=new Frame("按钮示例");
    	MyButton button=new MyButton();
    	frm.add(button);
    	frm.setSize(300,300);
    	frm.setVisible(true);
    }
  }