1  package com.soyoungboy;
 2 
 3  import java.util.concurrent.Semaphore;
 4  /**
 5  *
 6  * @author soyoungboy 2017年1月25日15:51:15
 7  *
 8  */
 9 public class SemaphoreTest {
10 static Semaphore semaphore = new Semaphore(5,true);
11  public static void main(String[] args) {
12  for(int i=0;i<100;i++){
13  new Thread(new Runnable() {
14 
15  @Override
16  public void run() {
17  test();
18  }
19  }).start();
20  }
21 
22  }
23 
24  public static void test(){
25  try {
26  //申请一个请求
27  semaphore.acquire();
28  } catch (InterruptedException e1) {
29  e1.printStackTrace();
30  }
31  System.out.println(Thread.currentThread().getName()+"进来了");
32  try {
33  Thread.sleep(1000);
34  } catch (InterruptedException e) {
35  e.printStackTrace();
36  }
37  System.out.println(Thread.currentThread().getName()+"走了");
38  //释放一个请求
39  semaphore.release();
40  }
41  }