JAVA线程程序设计实验报告

1、线程程序设计一、课题内容和要求内容：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。要求：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。二、设计思路分析class Clock: 一个指针式时钟的主类class Layout: 添加窗口和时钟组件class ClockPai nt: 定义时钟组件三、概要设计public class Clock exte nds JFrame public static void main( Stri ng s);class Layout exte nds

2、JFrame public Layout();class ClockPa int exte nds JPa nel impleme nts Runn able int x, y, r;int h, m, s;double rad = Math.PI / 180;public ClockPa in t(i nt x, int y, int r);public void pain "Graphics g);public void run();时钟的绘制：运行时钟:（）IIhrcad.sk-cpdOOO）中断一秒石車新运行s += 6秒"针走b度5 = O,ID +»

3、6h + 6m = 0*h +工 6（结束）*四、详细设计import java.awt.*;import javax.swi ng.*;import java.util.*;public class Clock exte nds JFrame public static void main(String s) new Layout。;class Layout extends JFrame / 添加窗口和时钟组件 public Layout() ClockPai nt cp = new ClockPai nt(20, 20, 70); add(cp);setBounds(260, 120, 2

4、00, 200);setResizable(false);this.setTitle(" 指针式时钟 ");this.setVisible(true); class ClockPaint extends JPanel implements Runnable / 定义时钟组件 int x, y, r;/ 时钟的位置坐标和半径 int h, m, s;/ 小时，分钟，秒 double rad = Math.PI / 180;/ 定义弧度public ClockPaint(int x, int y, int r) / 构造函数this.x = x;this.y = y;this.

5、r = r;Calendar now = Calendar.getInstance();/ 初始化日历对象s = now.get(Calendar.SECOND) * 6;/ 获得初始秒转换成度数m = now.get(Calendar.MINUTE) * 6;/ 获得初始分钟转换成度数h = (now.get(Calendar.HOUR_OF_DAY) - 12) * 30 + now.get(Calendar.MINUTE) * 6 / 12;/ 获得初始小时转换成度数加分钟 实现连贯Thread t = new Thread(this);/ 新建线程t.start();/ 启动线程pub

6、lic void paint(Graphics g) / 绘制时钟g.setColor(Color.BLACK);/ 画背景g.fillRect(0, 0, r * 3, r * 3);g.setColor(Color.WHITE);/ 画圆 g.drawOval(x, y, r * 2, r * 2);int d = 0;/ 每 6度画一个小点int x1, y1, x2, y2;for (int i = 0; i < 60; i+) x1 = (int) (r - 2) * Math.sin(rad * d); y1 = (int) (r - 2) * Math.cos(rad *

7、d); g.drawString(".", x + r + x1 - 1, x + r - y1 + 1); d += 6;d = 30;/ 从 30 度开始每 30度画一个数字和一线for (int i = 1; i <= 12; i+) x1 = (int) (r - 14) * Math.sin(rad * d);y1 = (int) (r - 14) * Math.cos(rad * d); g.drawString(i + "", x + r + x1 - 4, x + r - y1 + 5);x1 = (int) (r - 6) * M

8、ath.sin(rad * d);y1 = (int) (r - 6) * Math.cos(rad * d);x2 = (int) (r - 2) * Math.sin(rad * d);y2 = (int) (r - 2) * Math.cos(rad * d);g.drawLine(x + r + x2, y + r - y2, x + r + x1, y + r - y1); d += 30;g.setColor(Color.RED);/ 按时间画秒针x1 = (int) (0.8 * r) * Math.sin(rad * s);y1 = (int) (0.8 * r) * Math

9、.cos(rad * s); g.drawLine(x + r, y + r, x + r + x1, y + r - y1);g.setColor(Color.BLUE);/ 按时间画分针 x1 = (int) (0.6 * r) * Math.sin(rad * m); y1 = (int) (0.6 * r) * Math.cos(rad * m);g.drawLine(x + r, y + r, x + r + x1, y + r - y1);g.setColor(Color.YELLOW);/ 按时间画时针 x1 = (int) (0.4 * r) * Math.sin(rad *

10、h); y1 = (int) (0.4 * r) * Math.cos(rad * h);g.drawLine(x + r, y + r, x + r + x1, y + r - y1);g.setColor(Color.GREEN);/ 显示时间Calendar now1 = Calendar.getInstance(); g.drawString(now1.get(Calendar.HOUR_OF_DAY) + " ： " + now1.get(Calendar.MINUTE) + " ： " + now1.get(Calendar.SECOND),

11、 0, 10);public void run() / 运行时钟while (true) try Thread.sleep(1000);/ 中断一秒后重新运行 catch (Exception ex) System.out.println(ex);s += 6;/ 秒针走 6 度if (s >= 360) / 秒针走完一分钟后重置s = 0;m += 6;if (m = 72 | m = 144 | m = 216 | m = 288) /分针走完 5分钟后重置h += 6;if (m >= 360) /分针走完一小时后重置m = 0;h += 6;if (h >= 360) /时针走完12小时后重置h = 0;this.repaint();重新绘制时