南邮JAVA程序设计实验4 线程程序设计(指针式时钟)
实验目的：
本实验旨在通过实验，培养学生将JAVA 线程的相关知识点（包括线程调度，线程同步等）有机结合并加以综合应用，在实验中设计多线程程序的能力。
实验内容：
设计和编写一个编写一个指针式时钟程序，应用线程实现时钟的走动。
实验设计：
主要是控制时针分针秒针的转动度数，这个直接通过坐标的三角函数值求得，线程方面，隔一秒休眠一下，然后通过时分秒的换算关系来改变三个对应指示针在时钟上的位置
实验代码：
import java.awt.*;import javax.swing.*;import java.util.*;public class JavaClock extends JFrame {public JavaClock() {ClockPaint cp = new ClockPaint(20, 20, 70);this.add(cp);this.setSize(200, 200);this.setLocation(260, 120);this.setTitle("指针时钟");this.setVisible(true);this.setResizable(false);}public static void main(String[] s) {new JavaClock();}}class ClockPaint extends JPanel implements Runnable {int x, y, r;int hour, minute, second; //时，分，秒final double rad = Math.PI / 180;public ClockPaint(int x, int y, int r) {this.x = x;this.y = y;this.r = r;Calendar now = new GregorianCalendar();//获得时间转换成度数second = now.get(Calendar.SECOND) * 6;minute = now.get(Calendar.MINUTE) * 6;hour = (now.get(Calendar.HOUR_OF_DAY) – 12) * 30 + now.get(Calendar.MINUTE) / 12 * 6;Thread t = new Thread(this);t.start();}public void paint(Graphics g) {super.paint(g);g.setColor(Color.WHITE);g.fillRect(0, 0, r * 3, r * 3);g.setColor(Color.BLACK);g.drawOval(x, y, r * 2, r * 2);//秒针g.setColor(Color.GREEN);int x1 = (int)((r – 10) * Math.sin(rad * second));int y1 = (int)((r – 10) * Math.cos(rad * second));g.drawLine(x + r, y + r, x + r + x1, y + r – y1);//分针g.setColor(Color.BLUE);x1 = (int)((r – r / 2.5) * Math.sin(rad * minute));y1 = (int)((r – r / 2.5) * Math.cos(rad * minute));g.drawLine(x + r, y + r, x + r + x1, y + r – y1);//时针g.setColor(Color.RED);x1 = (int)((r – r / 1.5) * Math.sin(rad * hour));y1 = (int)((r – r / 1.5) * Math.cos(rad * hour));g.drawLine(x + r, y + r, x + r + x1, y + r – y1);//数字g.setColor(Color.BLACK);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;}//刻度线d = 0;for (int i = 0; i < 60; i++) {int len = 0; //控制每个分割点的长度，数字点上的分割线长一点if(d % 30 == 0) {len = 5;}else {len = 2;}for (int j = 1; j <= len; j++){x1 = (int)((r – j) * Math.sin(rad * d));y1 = (int)((r – j) * Math.cos(rad * d));g.drawString(".", x + r + x1 – 1, x + r – y1 + 1);}d += 6;}}public void run() {while (true) {try {Thread.sleep(1000); //休眠一秒}catch (Exception ex) {}second += 6; //每一秒，秒针动6度if (second == 60 || second == 120 || second == 180 || second == 240 || second == 300) {minute += 1; //每10秒，，分针动1度}//大于一分钟，分针和时针开始出现改变if (second == 360) {second = 0;minute += 1;if (minute == 72 || minute == 144 || minute == 216 || minute == 288) {hour += 6;}if (minute >= 360) {minute = 0;hour += 6;}if (hour >= 360) {hour = 0;}}this.repaint();}}}
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赶快上路吧，不要有一天我们在对方的葬礼上说，要是当时去了就好了。
