java简易电子时钟代码.doc

import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.util.*;import java.text.SimpleDateFormat;public class ClockJFrame extends JFrame private Date now=new Date(); Panel buttons=new Panel(); Button button_start=new Button(启动); Button button_interrupt=new Button(停止); Clock label=new Clock(); public ClockJFrame() /构造方法 super(电子时钟); this.setBounds(300,240,300,120); this.setDefaultCloseOperation(EXIT_ON_CLOSE); this.setLayout(new BorderLayout(); this.getContentPane().add(North,label);/初始化一个容器，用来在容器上添加一个标签 this.getContentPane().add(South,buttons); buttons.setLayout(new FlowLayout(); buttons.add(button_start); buttons.add(button_interrupt); setVisible(true); private class Clock extends Label implements ActionListener,Runnableprivate Thread clocker=null;private Date now=new Date(); public Clock() button_start.addActionListener(this); button_interrupt.addActionListener(this); SimpleDateFormat dateFormat = new SimpleDateFormat(HH:mm:ss);/可以方便地修改日期格式 String t = dateFormat.format( now ); this.setText(t); public void start()if(clocker=null)clocker=new Thread(this); clocker.start(); public void stop()clocker=null;public void run()Thread currentThread=Thread.currentThread();while(clocker=currentThread)now=new Date();SimpleDateFormat dateFormat = new SimpleDateFormat(HH:mm:ss);/可以方便地修改日期格式String t = dateFormat.format( now ); this.setText(t);tryclocker.sleep(1000);catch(InterruptedException ie)JOptionPane.showMessageDialog(this,Thread error:+ie); public void actionPerformed(ActionEvent e) if (e.getSource()=button_start) clocker = new Thread(this); /重新创建一个线程对象 clocker.start(); button_start.setEnabled(false); button_interrupt.setEnabled(true); if (e.getSource()=button_interrupt) /单击中断按钮时 clocker.stop(); /设置当前线程对象停止标记 button_start.setEnabled(true); button_interrupt.setEnab