java实现时钟

package com.js.ai.modules.pointwall.testxfz;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.text.DateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import javax.swing.JFrame;

public class ClockDemo extends JFrame implements Runnable{
Thread clock;
final int Xpoint=180;
final int Ypoint=180;
final int R=80;
int xHour=0,yHour=0,xSecond=0,ySecond=0,xMin=0,yMin=0;
public ClockDemo() {
	super("数字时钟");
	setFont(new Font("宋体", Font.BOLD, 20));
	start();
	setSize(360, 360);
	setVisible(true);
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void start()//开始进程
{
	if(clock==null)//如果进程为空值
	{
		clock=new Thread(this); //实例化进程
		clock.start();//开始进程
	}
}
public void run()//运行进程 
{
	while(clock!=null){
		repaint(); //调用paint方法重绘界面
		try {
			Thread.sleep(1000);//线程暂停一秒(1000毫秒)
		} catch (InterruptedException e) {
			
			e.printStackTrace();
		} 
	}
	
}
public void stop()//停止进程
{
	clock=null;
}
public void paint(Graphics g)//重载组件的paint方法
{
	Graphics2D g2=(Graphics2D) g;//得到Graphics2D对象
	DateFormat dateFormat=DateFormat.getDateInstance(DateFormat.FULL);
	Calendar now =new GregorianCalendar();//实例化日历对象
	now.setTime(new Date());//dateFormat.format(now.getTime())
	String timeInfo="";//输出信息
	int hour=now.get(Calendar.HOUR_OF_DAY);//得到小时数
	int minute=now.get(Calendar.MINUTE);//得到分数
	int second=now.get(Calendar.SECOND);//得到秒数
	if(hour<=9)
		timeInfo+="0"+hour+":";//格式化输出
	else
		timeInfo+=hour+":";
	if(minute<=9)
		timeInfo+="0"+minute+":";
	else
		timeInfo+=minute+":";
	if(second<=9)
		timeInfo+="0"+second+":";
	else
		timeInfo+=second+":";
	g.setColor(Color.yellow);//设置当前颜色为黄色
	Dimension dim=getSize();//得到窗口尺寸
	g.fillRect(0, 0, dim.width, dim.height);//填充背景
	g.setColor(Color.red);//设置当前颜色
	g.drawString(timeInfo, 130, 340);//显示时间字符串
	g.setColor(Color.green);
	g.drawString(dateFormat.format(now.getTime()),20,60);
	g.setColor(Color.black);
	g.setFont(new Font("SAN_SERIF", Font.BOLD, 15));
	for(int i=0,num=12;i<360;i+=6){
		double alfa=Math.toRadians(i);
		int xPox=Xpoint+(int)(R*Math.sin(alfa));
		int yPos=Ypoint-(int)(R*Math.cos(alfa));
		if(i==0)
		{
		if (num%3==0)
		g.setColor(Color.red); // 数字3,6,9,12为红色
		else
		g.setColor(Color.black); // 其余数字为黑色
		g.drawString(""+num,xPox-5,yPos+3); // 写数字
		num=(num+1);
		}
		else {
			g.setColor(Color.black);
			g.drawString(".",xPox,yPos);
		}
	}
	g.setColor(Color.black);
	g.fillOval(Xpoint-4,Ypoint-4,8,8);
	//画秒针
	xSecond=(int)(Xpoint+(R-10)*Math.sin(second*(2*Math.PI/60)));
	ySecond=(int)(Ypoint-(R-10)*Math.cos(second*(2*Math.PI/60)));
	g.setColor(Color.red);
	g.drawLine(Xpoint,Ypoint,xSecond,ySecond);
	//画分针
	xMin=(int)(Xpoint+(R-20)*Math.sin((minute+second/60)*(2*Math.PI/60)));
	yMin=(int)(Ypoint-(R-20)*Math.cos((minute+second/60)*(2*Math.PI/60)));
	g.setColor(Color.red);
	g.drawLine(Xpoint,Ypoint,xMin,yMin);
	//画时针
	xHour=(int)(Xpoint+(R-30)*Math.sin((hour+minute/60+second/60/60)*(2*Math.PI/12)));
	yHour=(int)(Ypoint-(R-30)*Math.cos((hour+minute/60+second/60/60)*(2*Math.PI/12)));
	g.setColor(Color.red);
	g.drawLine(Xpoint,Ypoint,xHour,yHour);
}
public static void main(String[] args)
{
new ClockDemo();
}
}