一、实验目的

1、练习多线程类的两种实现方法，理解多线程程序的生命周期。

二、实验内容

编写一多线程程序，实现如下功能： 

（1）一个线程进行阶乘和的运算（1！+2！+3！……+30!）， 每次阶乘计算时间随机间隔0.5-1秒；
（2）另一个线程每隔1秒时间读取上个线程的运算结果和计算 进程，并在图形界面中实时显示结果。

三、实验要求

1、正确设计显示运行结果和计算进程的图形用户界面；
2、分别采用Thread类的子类和Runnable接口两种方式完成两个 线程的设计；
3、进行全面的测试并分析测试结果；
4、简要说明你在该实验中的收获与体会

四、实验设计

1、设计三个类ComputeThread、ReturnThread和ThreadFrame，分别实现计算进程，返回结果进程和界面设计。

ThreadFrame类代码实现

public class ThreadFrame implements ActionListener{JFrame frame;JPanel panel1,panel2,panel3,panel4,panel5;Container container;JTextField output,resultfield;JButton button;JLabel label1,label2,label3,label4;JProgressBar jprogressBar;public ThreadFrame(){frame = new JFrame("多线程实验界面");frame.setBounds(400, 100, 730, 500);container=frame.getContentPane();frame.setResizable(false);frame.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e) {System.exit(1);}});label1 = new JLabel("多线程实验");label1.setForeground(Color.red);label1.setFont(new Font("Dialog",1,50));label2 = new JLabel("计算线程");label2.setFont(new Font("Dialog",1,30));label3 = new JLabel("运算结果");label3.setFont(new Font("Dialog",1,30));label4 = new JLabel("计算进度");label4.setFont(new Font("Dialog",1,30));output = new JTextField();output.setPreferredSize(new Dimension(550,40));output.setFont(new Font("Dialog",1,20));resultfield = new JTextField();resultfield.setFont(new Font("Dialog",1,20));resultfield.setPreferredSize(new Dimension(550,40));panel1 = new JPanel();panel2 = new JPanel();panel3 = new JPanel();panel4 = new JPanel();panel5 = new JPanel();button = new JButton("开始计算");button.setFont(new Font("Dialog",1,30));button.setPreferredSize(new Dimension(200,60));button.addActionListener(this);jprogressBar = new JProgressBar(0,30);jprogressBar.setPreferredSize(new Dimension(550,20));panel1.add(label1);panel2.add(label2);panel2.add(output);panel3.add(label3);panel3.add(resultfield);panel4.add(label4);panel4.add(jprogressBar);panel5.add(button);container.setLayout(new GridLayout(5,1));container.add(panel1);container.add(panel2);container.add(panel3);container.add(panel4);container.add(panel5);frame.show();}//开始计算监听器public void actionPerformed(ActionEvent e){ComputeThread computethread = new ComputeThread(this);Thread thread1 = new Thread (computethread);//实现runnable接口建立线程ReturnThread thread2 = new ReturnThread(this);//继承Thread类建立线程thread1.start();//启动线程thread2.start();//启动线程}public static void main(String[] args){ThreadFrame test = new ThreadFrame();}
}

ComputeThread类实现

public class ComputeThread implements Runnable{ThreadFrame threadframe ;static public double result = 0;static public int i;String str1 = "";public ComputeThread(ThreadFrame t) {threadframe = t;}public void run() {long s=1;for(i=1;i<=30;i++){if(str1.equals("")){str1=i+"!";}else{str1 += "+" + i + "!";}s *=i;result +=s;threadframe.output.setText(str1);threadframe.jprogressBar.setValue(i);try {Thread.sleep((long)(500 + 500 * Math.random()));} catch (InterruptedException e) {e.printStackTrace();System.out.println("第1个线程休眠时出错！");}}}
}

ReturnThread类实现

public class ReturnThread extends Thread{ThreadFrame threadFrame;public ReturnThread(ThreadFrame threadFrame){this.threadFrame = threadFrame;}public void run() {while(ComputeThread.i != 30){threadFrame.resultfield.setText("" + ComputeThread.result);try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();System.out.println("第2个线程休眠时出错！");}}
//这之后的代码确保显示的结果已经是最终结果try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();System.out.println("第2个线程在最后一次休眠时出错！");}threadFrame.resultfield.setText("" + ComputeThread.result);ComputeThread.result = 0;//初始化结果ComputeThread.i = 1;//初始化i值threadFrame.button.setText("重新计算");//重设按钮文字}
}