clock.java

一个钟表java小程序

import java.awt.Color; 
import java.util.*; 
import java.awt.*; 
import java.applet.*; 

public class Clock extends Applet implements Runnable 
{ 
Thread timer=null; 
Label label; 
int lastxs=50,lastys=30,lastxm=50,lastym=30,lastxh=50,lastyh=30; 

public void init() 
{ 
label=new Label(" "); 
setBackground(Color.red); 
add(label); 
} 
public void paint(Graphics g) 
{ 
int xh,yh,xm,ym,xs,ys,s,m,h,xcenter,ycenter; 
Date rightnow=new Date(); 
String today=rightnow.toLocaleString(); 
label.setText(today); 
s=rightnow.getSeconds(); 
m=rightnow.getMinutes(); 
h=rightnow.getHours(); 
xcenter=100; 
ycenter=80; 

xs=(int)(Math.cos(s*3.14f/30-3.14f/2)*45+xcenter); 
ys=(int)(Math.sin(s*3.14f/30-3.14f/2)*45+ycenter); 
xm=(int)(Math.cos(m*3.14f/30-3.14f/2)*45+xcenter); 
ym=(int)(Math.sin(m*3.14f/30-3.14f/2)*45+ycenter); 
xh=(int)(Math.cos((h*30+m*2)*3.14f/180-3.14f/2)*30+xcenter); 
yh=(int)(Math.sin((h*30+m*2)*3.14f/180-3.14f/2)*30+ycenter); 

g.setFont(new Font("TimesToman",Font.PLAIN,14)); 
g.setColor(Color.orange); 
g.fill3DRect(xcenter-50,ycenter-50,100,100,true); 
g.setColor(Color.darkGray); 
g.drawString("12",xcenter-5,ycenter-37); 
g.drawString("3",xcenter+40,ycenter+3); 
g.drawString("6",xcenter-3,ycenter+45); 
g.drawString("9",xcenter-45,ycenter+3); 

g.setColor(Color.orange); 
if(xs!=lastxs||ys!=lastys) 
{ 
g.drawLine(xcenter,ycenter,lastxs,lastys); 
} 
if(xm!=lastxm||ym!=lastym) 
{ 
g.drawLine(xcenter,ycenter-1,lastxm,lastym); 
g.drawLine(xcenter-1,ycenter,lastxm,lastym); 
} 
if(xh!=lastxh||yh!=lastyh) 
{ 
g.drawLine(xcenter,ycenter-1,lastxh,lastyh); 
g.drawLine(xcenter-1,ycenter,lastxh,lastyh); 
} 
g.setColor(Color.red); 

g.drawLine(xcenter,ycenter,xs,ys); 
g.drawLine(xcenter,ycenter-1,xm,ym); 
g.drawLine(xcenter-1,ycenter,xm,ym); 
g.drawLine(xcenter,ycenter-1,xh,yh); 
g.drawLine(xcenter-1,ycenter,xh,yh); 
lastxs=xs; 
lastys=ys; 
lastxm=xm; 
lastym=ym; 
lastxh=xh; 
lastyh=yh; 
} 
public void start() 
{ 
if(timer==null) 
{ 
timer=new Thread(this); 
timer.start(); 
} 
} 
public void stop() 
{ 
timer=null; 
} 
public void run() 
{ 
while(timer!=null) 
{ 
try 
{ 
Thread.sleep(1000); 
}catch(InterruptedException ie){} 
repaint(); 
} 
timer=null; 
} 
public void update(Graphics g) 
{ 
paint(g); 
} 
}