第2周：Java事件处理

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import java.applet.*;import java.awt.*;import java.awt.event.*;public class simpleEvent extends Applet implements ActionListener{   Label lb;   TextField in,out;   public void init()   {   lb= new Label("请输入您的名字");   in = new TextField(6);  //创建输入文本框       out = new TextField(20);   //创建输出文本框   add(lb);   add(in);   add(out);   in.addActionListener(this);   //将文本框注册给文本事件的监听者   }   public void actionPerformed(ActionEvent e)  //执行动作   {   out.setText(in.getText()+"欢迎光临");   }}

import java.applet.*;import java.awt.*;import java.awt.event.*;public class ButtonDemo extends Applet implements ActionListener{String msg ="";public void init(){Button yes = new Button("是");Button no = new Button("否");Button maybe = new Button("取消");add(yes);add(no);add(maybe);yes.addActionListener(this);no.addActionListener(this);maybe.addActionListener(this);}public void actionPerformed(ActionEvent e){String str = e.getActionCommand();if(str == "是"){msg = "您单击了按钮'是'。";}if(str == "否"){msg = "您单击了按钮'否'。";}if(str == "取消"){msg = "您单击了按钮'取消'。";}repaint();}public void paint(Graphics g){g.drawString(msg,6,100);}}

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