这是学校 java的一道期末考试题，钟表的指针借鉴的大佬的代码。。。。

代码流程

publicpublic class ClockApplet extends Applet implements Runnable{

全局变量的设置

初始化函数{

............

}

画图函数{

............

}

线程开始函数{

............

}

}

话不多说，直接上代码

import java.applet.Applet;

import java.awt.Color;

import java.awt.Graphics;

import java.util.Calendar;

import java.util.GregorianCalendar;

public class ClockApplet extends Applet implements Runnable{

int x,y,r;

int h,m,s;//时,分,秒

double rad = Math.PI/180;//  1°

//初始化函数

public void init() {

x = 0;

y = 0;

r = 100;

Calendar now = new GregorianCalendar();

s = now.get(Calendar.SECOND)*6;//转换成角度

m = now.get(Calendar.MINUTE)*6;//转换为角度

h = (now.get(Calendar.HOUR_OF_DAY)-12)*30

+ now.get(Calendar.MINUTE)/12*6;//获取小时

//线程

Thread t =new Thread(this);

t.start();

}

//画图函数

public void paint(Graphics g){

super.paint(g);

g.setColor(Color.WHITE);

g.fillRect(0, 0, 300, 300);//填充背景

g.setColor(Color.BLACK);

g.drawOval(x, y, r*2, r*2);//画表盘

/*drawLine(a,b,c,d)

* a b 起点坐标

* c d 终点坐标

*/

//秒针

int x1 = (int)(90*Math.sin(rad*s));

int y1 = (int)(90*Math.cos(rad*s));

g.drawLine(x+r, y+r, (x+r)+x1, (y+r)-y1);

//分针

x1 = (int)(80*Math.sin(rad*m));

y1 = (int)(80*Math.cos(rad*m));

g.drawLine(x+r, y+r, (x+r)+x1, (y+r)-y1);

//时针

x1 = (int)(60*Math.sin(rad*h));

y1 = (int)(60*Math.cos(rad*h));

g.drawLine(x+r, y+r, (x+r)+x1, (y+r)-y1);

//画数字

int d = 28;

for(int i=1;i<=12;i++){

x1 = (int)((r-10)*Math.sin(rad*d));

y1 = (int)((r-10)*Math.cos(rad*d));

g.drawString(i+"", x+r+x1-4, x+r-y1+5);

d += 30;

}

//画刻度

d = 0;

for(int i=1;i<=60;i++){

x1 = (int)((r-2)*Math.sin(rad*d));

y1 = (int)((r-2)*Math.cos(rad*d));

g.drawString(".", x+r+x1-1, x+r-y1+1);

d += 6;

}

//显示时间

Calendar now1 = new GregorianCalendar();

int a,b,c;

a = now1.get(Calendar.HOUR_OF_DAY);

b = now1.get(Calendar.MINUTE);

c = now1.get(Calendar.SECOND);

g.drawString(a + ":" + b + ":" + c, 0, 10);

}

//实现Runnable

public void run(){

while(true){

try{

Thread.sleep(1000);//间隔一秒

}catch(Exception ex){}

//秒针每次走6°

s += 6;

//秒针归零

if(s>=360){

s = 0;

m += 6;

//分针走72°，时针走6°

if(m==72 || m==144 || m==288){

h += 6;

}

//分针归零

if(m>=360){

m = 0;

h += 6;

}

//时针归零

if(h>=360){

h = 0;

}

}

//重新绘制

this.repaint();

}

}

}

结果如下图，遗憾的是左上角的时间显示比系统时间晚了几毫秒。

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