为什么我的时钟无法正常工作？

Question

我目前正在使用StandardPen类在java中使用时钟。除了当我在运行程序时大约6-10分钟时，一切似乎都正常工作，时钟开始出现故障。这个错误似乎在我添加了时针后就出现了。 由于thread.sleep（20）不能使用时针的速度，因此时针与第二手和分针不同的原因。有人请帮我修好这个快请

import java.awt.Color; 
import TurtleGraphics.StandardPen; 

public class Clock_Final { 
    public static void main(String[] args) { 

     StandardPen pen = new StandardPen(); 

     double num=90, num1 = 90, num3 = 90, loop = 1, minute = 90, minuteclear = 90, cont = 0, cont2 = 0, tick1 = 90, hour = 90, hourclear = 90, hourcount = 0, hourcount1 = 0; 
     String three = "3", six = "6", nine = "9", twelve = "12", signature = "Created by: Me"; 

     pen.setColor(Color.black); 
     pen.up(); 
     pen.setDirection(270); 
     pen.move(350); 
     pen.setDirection(180); 
     pen.move(60); 
     pen.drawString(signature); 
     pen.down(); 
     pen.home(); 
//twelve 
     pen.setColor(Color.black); 
     pen.up(); 
     pen.setDirection(90); 
     pen.move(280); 
     pen.setDirection(180); 
     pen.move(7); 
     pen.down(); 
     pen.drawString(twelve); 
     pen.home(); 
//three 
     pen.up(); 
     pen.setDirection(0); 
     pen.move(278); 
     pen.setDirection(270); 
     pen.move(5); 
     pen.down(); 
     pen.drawString(three); 
     pen.home(); 

//six       
     pen.up(); 
     pen.setDirection(270); 
     pen.move(290); 
     pen.setDirection(180); 
     pen.move(3); 
     pen.down(); 
     pen.drawString(six); 
     pen.home(); 

//nine 
     pen.up(); 
     pen.setDirection(180); 
     pen.move(285); 
     pen.setDirection(270); 
     pen.move(5); 
     pen.down(); 
     pen.drawString(nine); 
     pen.home(); 
//_-_-_outside of the clock (the circle) 
     for (cont = 0; cont < 360; cont++) { 
      pen.setColor(Color.black); 
      pen.setDirection(num); 
      pen.setWidth(8); 
      pen.up(); 
      pen.move(270); 
      pen.down(); 
      pen.move(2); 
      pen.home(); 
      num--; 

      if (num==0) { 
       num = 360; 
      } 
     } 
    //tick start 
     for (cont2=0;cont2<60;cont2++) { 
      pen.setColor(Color.gray); 

      pen.setDirection(tick1); 
      pen.setWidth(3); 
      pen.up(); 
//method for minute/second ticks (start) 
      if (tick1 == 0 || tick1 == 30 || tick1 == 60 || tick1 == 90 || tick1 == 120 || tick1 == 150 || tick1 == 180 || tick1 == 210 || tick1 == 240 || tick1 == 270 || tick1 == 300 || tick1 == 330) { 
       if (tick1 == 0 || tick1 == 90 || tick1 == 180 || tick1 == 270) { 
        pen.setColor(Color.black); 
        pen.setWidth(5); 
        pen.move(225); 
        pen.down(); 
        pen.move(39); 
        pen.setColor(Color.gray); 
       } else { 
        pen.setColor(Color.darkGray); 
        pen.move(230); 
        pen.down(); 
        pen.move(34); 
        pen.setColor(Color.gray); 
       } 
      } //method for minute ticks (end) 
      else if (tick1 != 0 || tick1 != 30 || tick1 != 60 || tick1 != 90 || tick1 != 120 || tick1 != 150 || tick1 != 180 || tick1 != 210 || tick1 != 240 || tick1 != 270 || tick1 != 300 || tick1 != 330) { 
       pen.move(250); 
       pen.down(); 
       pen.move(14); 
      } 
      pen.home(); 
      if (tick1 == 0) { 
       tick1 = 360; 
      } 
      tick1 = tick1 - 6; 
     } 
     while (loop == 1) { 
     pen.setWidth(2); 
     //draw new second hand 
       pen.setColor(Color.red); 
       pen.setDirection(num1); 
       pen.move(220); 

       if (num1 < .05) { 
        num1 = 360; 
       } 
       num1 -= .3; 

     //draw new minute hand 
       pen.home(); 
       pen.setColor(Color.darkGray); 
       pen.setDirection(minute); 
       pen.move(200); 

       if (minute == 1) { 
        minute = 360; 
       } 
       minute -= .005; 

     //draw new hour hand 
       pen.home(); 
       pen.setColor(Color.darkGray); 
       pen.setDirection(hour); 
       pen.move(160); 

       if (hour == 0) { 
        hour = 360; 
       } 
       hourcount+=.05; 
       if (hourcount % 360 == 0) { 
        hour -= 1; 
       } 

       //sleep 
       try { 
        Thread.sleep(50); 
       } catch (InterruptedException e) { 
        e.printStackTrace(); 
       } 

    //clear old second hand 
       pen.home(); 
       pen.setColor(Color.white); 
       pen.setDirection(num3); 
       pen.move(220); 

       if (num3 < .05) { 
        num3 = 360; 
       } 
       num3 -= .3; 

       pen.home(); 

    //clear old minute hand 
       pen.home(); 
       pen.setColor(Color.white); 
       pen.setDirection(minuteclear); 
       pen.move(200); 

       if (minuteclear == 0) { 
        minuteclear = 360; 
       } 
       minuteclear -= .005; 

       pen.home(); 

    //clear old hour hand 
       pen.home(); 
       pen.setColor(Color.white); 
       pen.setDirection(hourclear); 
       pen.move(160); 

       if (hourclear == 0) { 
        hourclear = 360; 
       } 
       hourcount1+=.05; 
       if (hourcount1 % 360 == 0) { 
        hourclear -= 1; 
       } 

       pen.home(); 

     } 
    } 
} 

Answer 1

我假设你的意思是“毛刺”，你的意思是失去时间？使用sleep（）来驱动你的时钟的问题是，你永远不知道它睡了多久，并且绘制你的时钟也需要时间。随着时间的推移，小时间错误将会累积。多任务和线程调度意味着你永远不知道实际已经过了多少时间。您仍然可以使用sleep（）来决定何时绘制时钟，但您需要“获取”实际时间并根据该时间绘制时钟。见：新的Date（）和GregorianCalendar的（）

Calendar calendar = GregorianCalendar.getInstance(); 
calendar.setTime(new Date()); // current time 
int mins = calendar.get(Calendar.MINUTE); 
// etc.. 

这里是一个时钟渲染我写了使用此方法...

https://code.google.com/p/catchpole/source/browse/trunk/catchpole-fuse/src/main/java/net/catchpole/awt/ClockFaceRenderer.java