例8.12 wait(), notify(), notifyAll() 协调同步线程

class TicketSeller //负责卖票的类。
{
int fiveNumber=1,tenNumber=0,twentyNumber=0;
public synchronized void sellTicket(int receiveMoney)
{
if(receiveMoney==5)
{
fiveNumber=fiveNumber+1;
System.out.printf("%s给我5元钱，这是您的1张入场卷\n",
Thread.currentThread().getName());
}
else if(receiveMoney==10)
{
while(fiveNumber<1)
{
try {
System.out.printf("%30s靠边等\n",Thread.currentThread().getName());
wait(); //如果线程占有CUP期间执行了wait,就进入中断状态。
System.out.printf("%30s结束等待\n",Thread.currentThread().getName());
}
catch(InterruptedException e)
{
}
}
fiveNumber=fiveNumber-1;
tenNumber=tenNumber+1;
System.out.printf("%s给我10元钱，找您5元，这是您的1张入场卷\n",
Thread.currentThread().getName());
}
else if(receiveMoney==20)
{
while(fiveNumber<1||tenNumber<1)
{
try {
System.out.printf("%30s靠边等\n",Thread.currentThread().getName());
wait(); //如果线程占有CUP期间执行了wait,就进入中断状态。
System.out.printf("%30s结束等待\n",Thread.currentThread().getName());
}
catch(InterruptedException e)
{
}
}
fiveNumber=fiveNumber-1;
tenNumber=tenNumber-1;
twentyNumber=twentyNumber+1;
System.out.printf("%s给20元钱，找您一张5元和一张10元，这是您的1张入场卷",
Thread.currentThread().getName());
}
notifyAll();
}
}
class Cinema implements Runnable //实现Runnable接口的类（电影院）。
{
Thread zhang,sun,zhao; //电影院中买票的线程。
TicketSeller seller; //电影院的售票员。
Cinema()
{
zhang=new Thread(this);
sun=new Thread(this);
zhao=new Thread(this);
zhang.setName("张小有");
sun.setName("孙大名");
zhao.setName("赵中堂");
seller=new TicketSeller();
}
public void run()
{
if(Thread.currentThread()==zhang)
{
seller.sellTicket(20);
}
else if(Thread.currentThread()==sun)
{
seller.sellTicket(10);
}
else if(Thread.currentThread()==zhao)
{
seller.sellTicket(5);
}
}
}
public class Example
{
public static void main(String args[])
{
Cinema a=new Cinema();
a.zhang.start();
a.sun.start();
a.zhao.start();
}
}