题目求解答

Question

有3个线程：zhangXiao、zhengMing和teacher，其中2线程zhangXiao和zhengMing准备休眠10秒钟后，再分别输出“老师好！”和“good morning”。teacher线程在输出5句“上课”后，吵醒休眠的线程：zhangXiao、zhengMing。请编写程序实现以上过程。

Answer 1

public class Test implements Runnable
{
Thread zhangXiao, zhengMing, teacher; String lock = new String(""); boolean runOk = true; int count; public void go()
{
teacher = new Thread(this);
teacher.setName("teacher");
teacher.start(); zhangXiao = new ThreadZhangXiao();
zhangXiao.setName("zhangXiao");
zhangXiao.start(); zhengMing = new ThreadZhengMing();
zhengMing.setName("zhengMing");
zhengMing.start(); } public static void main(String[] args)
{
new Test().go();
// System.out.println(Thread.currentThread().getName());
} public void run()
{ while (runOk)
{
count++;
System.out.println("Class Begins!");
if (count >= 5)
{
synchronized (zhangXiao)
{
zhangXiao.notify();
runOk = false;
} synchronized (zhengMing)
{
zhengMing.notify();
runOk = false;
}
}
}
} class ThreadZhangXiao extends Thread
{
public void run()
{
try
{
synchronized (zhangXiao)
{
while (runOk)
{
zhangXiao.wait();
}
System.out
.println("zhangXiao says: Good morning, Teacher!");
}
}
catch (InterruptedException e)
{
e.printStackTrace();
}
}
} class ThreadZhengMing extends Thread
{
public void run()
{
try
{
synchronized (zhengMing)
{
while (runOk)
{
zhengMing.wait();
}
System.out
.println("zhengMing says: Good morning, Teacher!");
}
}
catch (InterruptedException e)
{
e.printStackTrace();
}
} }
}