第2周（2014/3/16）：Java事件处理

来源：互联网发布：js原型是什么编辑：程序博客网时间：2024/05/27 21:09

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);out=new TextField(20);add(lb);add(in);add(out);in.addActionListener(this);}public void actionPerformed(ActionEvent e){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="";//定义按钮“是”，“否”，“取消”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’。";}else if (str=="否"){msg="您单击了按钮‘否’";}else{msg="您单击了按钮‘取消’。";}repaint();}public void paint(Graphics g){g.drawString(msg, 6, 100);}}

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