java线程睡眠问题

kared 2012-12-23 10:45:48

这是我的代码

package org.com.JframeDemo;



public class ControlClass {

	private int readCount; // 需要读的读者

	private int writeCount; // 需要写的写者

	private boolean cRead; // 读者的状态

	private boolean cWrite; // 学者的状态

	public static int a;



	public ControlClass() { // 初始化数据

		readCount = 0;

		writeCount = 0;

		cRead = false;

		cWrite = false;

	}



	public static void sleeptime() { // 睡眠时间

		int sleepTime = (int) (Math.random());

		try {

			Thread.sleep(sleepTime * 10000);

		} catch (Exception e) {

			// TODO: handle exception

			e.printStackTrace();

		}

	}



	public synchronized void startRead() { // 读者开始读取

		if (cRead == false) {

			while (writeCount > 0) { // 写者优先

				try {

					a=0;

					wait();

				} catch (InterruptedException e) {

					// TODO Auto-generated catch block

					System.out.println(e.toString());

					e.printStackTrace();

				}

			}

		}

		readCount++;

		if (readCount == 1) {

			cRead = true; // 返回有读者正在读

		}

	}



	public synchronized void endRead() { // 读者结束读取

		--readCount;

		if (readCount == 0) {

			cRead = false;

		}

		notifyAll(); // 释放空间



	}



	public synchronized void startWrite() { // 写者开始写

		writeCount++;

		if (cRead == true || cWrite == true) {

			a=1;

			try {

				wait();

			} catch (InterruptedException e) {

				// TODO Auto-generated catch block

				System.out.println(e.toString());

				e.printStackTrace();

			}

		}

		cWrite = true;

	}



	public synchronized void endWrite() {

		writeCount++;

		cWrite = false;

		notifyAll();

	}

}

package org.com.JframeDemo;



import java.text.SimpleDateFormat;

import java.util.Date;



import javax.swing.JTextArea;



public class Reader implements Runnable {

	private ControlClass controlClass;

	private JTextArea t;

	private int reader;

	public static String str = "",time1,time2;



	public Reader(int reader, JTextArea t, ControlClass controlClass) {

		this.reader = reader;

		this.t = t;

		this.controlClass = controlClass;

	}



	@Override

	public void run() {

		// TODO Auto-generated method stub

		while (true) {

		    final SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss"); 

		    time1 = format.format(new Date());

			str = time1+"读者" + reader + "准备读取" + '\n';

			t.append(str);

			controlClass.startRead(); // 读者开始工作

			str = "读者" + reader + "正在读取" + '\n';

			t.append(str);

			ControlClass.sleeptime(); // 读者处于工作阶段

			controlClass.endRead(); // 读者结束读取

			str = "读者" + reader + "完成读取" + '\n';

			t.append(str);

		}

	}

}

package org.com.JframeDemo;



import java.text.SimpleDateFormat;

import java.util.Date;



import javax.swing.JTextArea;



public class Writer implements Runnable {

	private ControlClass controlClass;

	private int writer;

	private JTextArea t;

	public static String str,time1,time2;



	public Writer(int writer, JTextArea t, ControlClass controlClass) {

		this.writer = writer;

		this.t = t;

		this.controlClass = controlClass;



	}



	@Override

	public void run() {

		// TODO Auto-generated method stub

		while (true) {

			final SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");

			time1 = format.format(new Date());

			str = time1+"写者" + writer + "准备写取" + '\n';

			t.append(str);

			controlClass.startWrite();

			str = "写者" + writer + "正在写取" + '\n';

			t.append(str);

			ControlClass.sleeptime();		

			controlClass.endRead();

			str = "写者" + writer + "完成写取" + '\n';

			t.append(str);

		}

	}

}

package org.com.JframeDemo;



import java.awt.BorderLayout;

import java.awt.Container;

import java.awt.Dimension;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;



import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;

import javax.swing.JToolBar;



public class ThreadTest extends JFrame {

	JButton start, end;

	JPanel[] LL;

	JTextArea[] T;// 存放信息

	JScrollPane[] S;

	public ThreadTest() {

		setTitle("读者写者问题模拟");

		setSize(600, 650);

		JPanel panel = new JPanel();

		JPanel p2 = new JPanel();

		JToolBar TB = new JToolBar();

		Container ct = this.getContentPane();

		

		LL = new JPanel[7];

		T = new JTextArea[7];

		S = new JScrollPane[7];

		for (int i = 1; i <= 6; i++) {



			LL[i] = new JPanel();

			T[i] = new JTextArea();



			T[i].setPreferredSize(new Dimension(550, 600));

			S[i] = new JScrollPane();

			S[i].setPreferredSize(new Dimension(400, 150));

			LL[i].setPreferredSize(new Dimension(650, 70));

			S[i].add(T[i]);

			S[i].setViewportView(T[i]);

			LL[i].add(S[i]);

		}

		// 读者线程

		start = new JButton("开始");

		start.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent event) {

			    ControlClass controlClass=new ControlClass();

				Reader r1 = new Reader(1, T[1], controlClass);

				Reader r2 = new Reader(2, T[2], controlClass);

				Reader r3 = new Reader(3, T[3], controlClass);

				Reader r4 = new Reader(4, T[4], controlClass);

				// 写者线程

				Writer w1 = new Writer(1, T[5], controlClass);

				Writer w2 = new Writer(2, T[6], controlClass);

				Thread demo01 = new Thread(r1);

				demo01.start();

				Thread demo02 = new Thread(r2);

				demo02.start();

				Thread demo03 = new Thread(r3);

				demo03.start();

				Thread demo05 = new Thread(w1);

				demo05.start();

				Thread demo04 = new Thread(r4);

				demo04.start();

				Thread demo06 = new Thread(w2);

				demo06.start();

			}

		});



		end = new JButton("结束");

		end.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent event) {

				System.exit(0);

			}

		});

		TB.add(start);

		TB.add(end);

		add(TB, BorderLayout.NORTH);

		ct.add(panel, BorderLayout.SOUTH);

		p2.add(LL[1]);

		p2.add(LL[2]);

		p2.add(LL[3]);

		p2.add(LL[4]);

		p2.add(LL[5]);

		p2.add(LL[6]);

		ct.add(p2, BorderLayout.CENTER);



	}



	public static void main(String[] args) {

		ThreadTest threadTests = new ThreadTest();

		threadTests.setVisible(true);

		threadTests.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	}

}