信号量Semaphore使用

public static void main(String[] args) {
        Semaphore semaphore=new Semaphore(2,false);
        for(int i=0;i<10;i++){
            new  Thread(new Test01(semaphore)).start();
        }

    }

public class Test01 implements Runnable{

    private final Semaphore semaphore;

    public Test01(Semaphore semaphore) {
        this.semaphore=semaphore;
    }

    @Override
    public void run() {
        try {
            //获取许可，未获取阻塞
            semaphore.acquire();
            System.out.println("======我进来了"+Thread.currentThread().getName());
            Thread.sleep(5000);
            //释放许可
            semaphore.release();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        //}
    }
}