线程的协作

 

 

 

 

class Printer extends Thread

{

    Vector task = new Vector();

    boolean runing = false;

    public void start()

    {

        runing = true;

        super.start();

    }

    public void run()

    {

        try

        {

            System.out.println("打印开始");

            while (runing)

            {

                synchronized (this)

                {

                    while ((task.size() == 0) && runing)

                    {

                        // 如果任务列表为空，而且线程还允许运行,则等待任务

                        System.out.println("没有什么内容可以打印了，等待中~~~~");

                        wait();

                        System.out.println("等待结束,准备打印内容");

                    }

                }

                if (runing)

                {

                    //for(int i=0;i<task.size();i++)

                    System.out.println("任务是: " + task.lastElement());

                    task.remove(0);

                }

            }

            System.out.println("打印结束");

        } catch (Exception e)

        {

            // TODO: handle exception

            e.printStackTrace();

        }

    }

 

    // 添加待打印的任务

    public void addTask(String s)

    {

        synchronized (this)

        {

            this.task.add(s);

            //this.task.add(s);

            //this.task.add(s);

            System.out.println("有内容可以打印了  唤醒打印线程");

            notify();

            // notifyAll();

        }

 

    }

 

    public void stopPrinter()

    {

        this.runing = false;

        synchronized (this)

        {

            System.out.println("停止打印线程 ");

            notify();

            // noitfyAll();

        }

    }

 

}

 

public class WaitNotify

{

    public static void main(String[] args)

    {

        Printer printer = new Printer();

        printer.start();

        try

        {

            Thread.sleep(2000);

            for (int i = 0; i < 500; i++)

            {

                Thread.sleep(1000);

                printer.addTask("打印的i的结果是" + i);

            }

        } catch (InterruptedException e)

        {

            // TODO: handle exception

            e.printStackTrace();

        }

 

        printer.stopPrinter();

 

    }

}