一 semaphore多线程访问

1.1 代码

public class Xinhaoliang {
    public static void main(String[] args) {
        Semaphore  semaphore=new Semaphore(3);
        for(int k=1;k<8;k++){
            final int  m=k;
            new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        semaphore.acquire();
                        System.out.println("我是"+m+"号车，开进来了........");
                        Thread.sleep(5000);
                        System.out.println("我是"+m+"号车，走喽........");
                        semaphore.release();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }).start();
        }
    }
}

1.2  执行结果