package com.jysemel.java.lock;

import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

public class SemaphoreDemo {


    public static void main(String[] args) {
        Semaphore semaphore = new Semaphore(2);
        for (int i = 0; i < 10; i++) {
            int finalI = i;
            new Thread(() -> {
                try {
                    if (semaphore.tryAcquire(1, TimeUnit.SECONDS)) {
                        System.out.println(finalI + "-" + Thread.currentThread().getName() + " 获取信号量");
                        System.out.println(finalI + "-" + Thread.currentThread().getName() + " 正在运行");
                        Thread.sleep(TimeUnit.SECONDS.toMillis(6));
                        semaphore.release();
                        System.out.println(Thread.currentThread().getName() + " 释放信号量");
                    } else {
                        System.out.println(finalI + "-" + "未获取 跳过丢弃");
                    }
                } catch (InterruptedException e) {
                    System.out.println(Thread.currentThread().getName() + " 获取异常");
                }
            }).start();
        }
    }
}