为什么我的时钟不能很好地工作？
为什么我的时钟不能很好地工作？
提问于 2014-01-12 11:31:51
我目前正在使用StandardPen类在java中开发一个时钟。一切似乎都很正常，除了当我在运行程序时达到大约6-10分钟时，时钟开始出故障。这个错误似乎是在我添加时针之后出现的。时针与秒针和分针的代码不同的原因是因为thread.sleep(20)不能以时针的速度工作。谁能快点帮我把这个修好
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();
}
}
}回答 1
Stack Overflow用户
发布于 2014-01-12 12:11:12
我猜你的意思是“失控”，你的意思是浪费时间？使用sleep()来驱动时钟的问题是，您永远不会真正知道它已经睡了多长时间，而且绘制时钟也需要时间。随着时间的推移，小的计时误差将会累积。此外，多任务和线程调度意味着您永远不会知道实际经过了多少时间。您仍然可以使用sleep()来决定何时绘制时钟，但您需要“获取”实际时间并基于此绘制时钟。请参阅: new Date()和GregorianCalendar()
Calendar calendar = GregorianCalendar.getInstance();
calendar.setTime(new Date()); // current time
int mins = calendar.get(Calendar.MINUTE);
// etc..这是我写的一个时钟渲染器，它使用了这个方法...
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/21070981
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