timepanel.java

修改系统时间

/**
 * 
 */
package test;

/**
 * @author 张雷
 *
 */
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;
import javax.swing.Timer;



import java.util.*;
import java.text.*;
/* *定义TimePanel类，在面板上 *显示当前的系统时间 */
public class TimePanel extends Panel implements Runnable{
	
	Thread clockThread = null;
	public TimePanel() {
		super();
		start();
		setSize(300,300);
		Color bgColor = new Color(240,240,240);
		setBackground(bgColor);
		
		setVisible(true);
	}
	
	


	public void start(){
		if(clockThread == null){
			clockThread = new Thread(this);
			clockThread.start();
		}
	}
	public static void main(String[] args) {
		new TimePanel();

	}

	public void run() {
		Thread myThread = Thread.currentThread();
		while(clockThread == myThread){
			repaint();
			try{
				Thread.sleep(1000);
			}catch(InterruptedException e){
				e.getStackTrace();
			}
		}
	}
	
	public void paint(Graphics g){
		g.drawString("当前时间为:", 10,200);
		Date date = new Date();
		DateFormat formatter = DateFormat.getTimeInstance();
		String str = formatter.format(date);
		g.drawString(str,80,200);
	}
	
	public void stop(){
		clockThread = null;
	}

}