Java中信号量Semaphore的简单使用

Java中信号量Semaphore的简单使用；

假设有3个人去银行办事，只有2个柜员，3人同时到达后须有一人等待，等待前两人办完之后再进行

import java.util.concurrent.Semaphore;

public class SemaphoreTest {

public static void main(String[] args) {
Semaphore semaphore = new Semaphore(2);

Person pA = new Person(semaphore, "A");
pA.start();
Person pB = new Person(semaphore, "B");
pB.start();
Person pC = new Person(semaphore, "C");
pC.start();
}

}

class Person extends Thread {

private Semaphore semaphore;

public Person(Semaphore semaphore, String name) {
setName(name);
this.semaphore = semaphore;
}

public void run() {
System.out.println(getName() + "正在等待");

try {
semaphore.acquire();
System.out.println(getName() + "正在服务");
sleep(10000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
semaphore.release();
System.out.println(getName() + "完成服务");
}
}