多线程之经典生产者消费者问题

通过信号量，wait,nofity,synchronized来解决生产者消费者问题。

实例如下：

package thread;

public class ThreadWaitAndNotifyTest {

/**
* @param args
*/
public static void main(String[] args) {
Iphone iphone = new Iphone();
Thread t1 = new Thread(new Producer(iphone));
Thread t2 = new Thread(new Salesman(iphone));
t1.start();
t2.start();
}

}

class Iphone {
// Iphone是否已卖掉
private boolean isSaled = true;
private String name;

public synchronized void setName(int i) {
System.out.println(Thread.currentThread().getName()+"正在生产第"+(i)+"部IPhone...");
if (!isSaled) {
System.out.println(Thread.currentThread().getName()+"第" + (i-1)+ "部IPhone等待被卖掉。");
try {
wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
// System.out.println(Thread.currentThread().getName()+"第" + (i-1)+ "部IPhone已被卖掉。");
}

this.name = "Iphone 5S("+i+")";
this.isSaled = false;
System.out.println(Thread.currentThread().getName()+"已生产第"+(i)+"部IPhone...");
notify(); // 通知消费者线程已生产IPhone，等待被卖掉。
}

public synchronized String getName(int i) {
if (isSaled) {
System.out.println(Thread.currentThread().getName()+"wait for sale start...");
try {
wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()+"wait for sale end...");
}

this.isSaled = true;
System.out.println(Thread.currentThread().getName() + "第"+i+"部IPhone已被卖掉。");
notify(); // 通知生产者线程该IPhone已被卖掉，可以生产下一部了。
return this.name;
}
}

class Producer implements Runnable {
Iphone iphone ;

public Producer(Iphone iphone) {
this.iphone = iphone;
}

@Override
public void run() {
for (int i=0;i<10;i++) {
try {
this.iphone.setName(i+1);
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

}

class Salesman implements Runnable {
Iphone iphone;
Salesman(Iphone iphone) {
this.iphone = iphone;
}
@Override
public void run() {
for (int i=0;i<10;i++) {
this.iphone.getName(i+1);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}

}

<p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">程序运行结果如下:</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0正在生产第1部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0已生产第1部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-1第1部IPhone已被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0正在生产第2部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0已生产第2部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0正在生产第3部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0第2部IPhone等待被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-1第2部IPhone已被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0已生产第3部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0正在生产第4部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0第3部IPhone等待被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-1第3部IPhone已被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0已生产第4部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0正在生产第5部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0第4部IPhone等待被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-1第4部IPhone已被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0已生产第5部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0正在生产第6部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0第5部IPhone等待被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-1第5部IPhone已被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0已生产第6部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0正在生产第7部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0第6部IPhone等待被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-1第6部IPhone已被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0已生产第7部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0正在生产第8部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0第7部IPhone等待被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-1第7部IPhone已被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0已生产第8部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0正在生产第9部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0第8部IPhone等待被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-1第8部IPhone已被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0已生产第9部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0正在生产第10部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0第9部IPhone等待被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-1第9部IPhone已被卖掉。</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-0已生产第10部IPhone...</p><p style="margin: 0px auto; padding-top: 0px; padding-bottom: 0px; list-style: none;">Thread-1第10部IPhone已被卖掉。</p>