package com.renrenche.thread;
/**
* 信号灯的测试
*/
public class SemaphoreTest {
public static void main(String[] args){
ExecutorService threadPool = Executors.newCachedThreadPool();
final Semaphore semaphore = new Semaphore(3);
for(int i=0;i<10;i++){
Runnable runnable=new Runnable(){
@Override
public void run() {
try {
semaphore.acquire();
}catch (Exception e){
e.printStackTrace();
}
System.out.println("线程"+Thread.currentThread().getName()+"已经进入，当前已经有："+(3-semaphore.availablePermits())+"个线程！");
try {
Thread.sleep((long)(Math.random()*10000));
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("线程"+Thread.currentThread().getName()+"即将离开");
semaphore.release();
System.out.println("当前线程"+Thread.currentThread().getName()+"已经离开，当前已经有："+(3-semaphore.availablePermits())+"个线程！");
}
};
threadPool.execute(runnable);
}
System.out.println("main end");
}
}
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github:??https://github.com/wangrui0/