date00.java

主要解决屏闪的问题

import java.applet.*;
import java.awt.*;
import java.util.*;
import java.awt.event.*;
import java.math.*;

public class Date00 extends Applet implements Runnable
{
	Date t; Thread tr; Image buf; Graphics bg; int w,h;double m1=0.0;
	double m2=0.0;double m3=0.0;double m=0.0;double m0=0.0;
	public void init()
	{	
		t=new Date();
		this.setBackground(new Color(255,255,255));
		this.setSize(500,600);
		w=this.getWidth();h=this.getHeight();
		tr=new Thread(this);
		tr.start();	
	}
	
	public void run()
	{
		while(true)
		{
			t=new Date();
			
			m1=t.getSeconds()*Math.PI/30;
			m2=t.getMinutes()*Math.PI/30;
			m3=t.getHours()*Math.PI/6+t.getMinutes()*Math.PI/360;
			
			repaint();
			try{tr.sleep(1000);}catch(java.lang.InterruptedException ie){}
		}
	}
	
	public void update(Graphics g)
	{
		paint(g);
	}
	
	public void paint(Graphics g)
	{
		int a=w/2,b=h/2;int x0,y0, x,y, x1,y1,x2,y2,x3,y3;int r=150;int r1=120;int r2=100;int r3=60;
		
		if(buf==null)
		{buf=this.createImage(w,h);bg=buf.getGraphics();}
		
		x1=a+(int)(r1*Math.sin(m1));y1=b-(int)(r1*Math.cos(m1));
		x2=a+(int)(r2*Math.sin(m2));y2=b-(int)(r2*Math.cos(m2));
		x3=a+(int)(r3*Math.sin(m3));y3=b-(int)(r3*Math.cos(m3));
		
		bg.clearRect(0,0,w,h);
		//bg.setFont(new Font("宋体",Font.BOLD,24));
		bg.drawString(t.toString(),180,100);
		bg.drawOval(a-r,b-r,2*r,2*r);
		for(int i=1;i<=60;i++)
		{	m=i*Math.PI/30;
			x=a+(int)(r*Math.sin(m));y=b-(int)(r*Math.cos(m));
			bg.drawLine(a,b,x,y);
			bg.drawLine(a,b,x,y);
		}
		
		bg.setColor(this.getBackground());
		bg.fillOval(a-(r1+20),b-(r1+20),2*(r1+20),2*(r1+20));
		
		
		bg.setColor(new Color(0,0,0));
		for(int j=1;j<=4;j++)
		{	m0=j*Math.PI/2;
			x0=a+(int)(r*Math.sin(m0));y0=b-(int)(r*Math.cos(m0));
			bg.drawLine(a,b,x0,y0);
			bg.drawLine(a,b,x0,y0);
		}
		
		bg.setColor(this.getBackground());
		bg.fillOval(a-(r1+10),b-(r1+10),2*(r1+10),2*(r1+10));
	
		bg.setColor(new Color(0,0,0));
		bg.drawLine(a,b,x1,y1);
		bg.drawLine(a,b,x2,y2);
		bg.drawLine(a,b,x3,y3);
		//bg.setColor(Color.blue);
		bg.drawString("12",a-6,b-120);
		bg.drawString("12",a-6,b-120);
		bg.drawString("3",a+120,b+5);
		bg.drawString("3",a+120,b+5);
		bg.drawString("6",a-3,b+128);
		bg.drawString("6",a-3,b+128);
		bg.drawString("9",a-128,b+5);
		bg.drawString("9",a-128,b+5);
		
		
		
		g.drawImage(buf,0,0,w,h,null);
		
		
		
	
	}
}