clock.java

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package clock;



import java.awt.Canvas;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.text.SimpleDateFormat;
import java.util.Calendar;
class Clock extends Canvas implements Runnable{
    /** *//**
     * 
     */
    private static final long serialVersionUID = 3660124045489727166L;
    MainFrame mf;
    Thread t;
    String time;
    public Clock(MainFrame mf){
    this.mf=mf;
    setSize(280,40);
    setBackground(Color.white);
    t=new Thread(this);                //实例化线程
    t.start();                        //调用线程
    }
    public void run(){
    while(true){
    try{
    Thread.sleep(1000);                    //休眠1秒钟
    }catch(InterruptedException e){
    System.out.println("异常");
    }
    this.repaint(100);
    }
    }
    public void paint(Graphics g){
    Font f=new Font("宋体",Font.BOLD,16);
    SimpleDateFormat SDF=new SimpleDateFormat("yyyy'年'MM'月'dd'日'HH:mm:ss");//格式化时间显示类型
    Calendar now=Calendar.getInstance();
    time=SDF.format(now.getTime());        //得到当前日期和时间
    g.setFont(f);
    g.setColor(Color.orange);
    g.drawString(time,45,25);
    }
}