这是一个关于多线程的!

来源：互联网发布：淘宝美食主播招聘编辑：程序博客网时间：2024/05/21 09:36

class TestThread
{
public static void main(String[] args)
{
  Data dd = new Data();
  T1 t1 = new T1(dd);
  T2 t2 = new T2(dd);
  t1.start();
  t2.start();
}
};

class Data
{
char c;
boolean flag;
};

class T1 extends Thread
{
Data d;
public T1(Data d)
{
this.d = d; //此处前面的this.d可以省略掉this
}

public void run()
{
  for (int i = 0;i < 20 ;i++ )
  {
   synchronized(d)
   {
    while (d.flag)
    {
     try
     {
      d.wait();
     }
     catch (Exception error)
     {
     }
    }
    d.c = (char)('A' + (int)(Math.random()*26));
    d.flag = true;
    System.out.println("产生: " + d.c);
    d.notify();  //此处用d.notifyAll();可以唤醒等待的所有线程
   }
   try
   {
    Thread.sleep((int)(Math.random()*1000));
   }
   catch (Exception error)
   {
   }
  }
}
};

class T2 extends Thread
{
Data d;
public T2(Data d)
{
this.d = d;
}

public void run()
{
  for (int i = 0;i < 20 ;i++ )
  {
   synchronized(d)
   {
    while (!d.flag)
    {
     try
     {
      d.wait();
     }
     catch (Exception error)
     {
     }
    }
    System.out.println("产生: " + d.c);
    d.flag = false;
    d.notify();    //此处用d.notifyAll();可以唤醒等待的所有线程
   }
   try
   {
    Thread.sleep((int)(Math.random()*1000));
   }
   catch (Exception error)
   {
   }
  }
}
};