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T32.java
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package com.basic;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
/**
* @program JavaBooks
* @description: Semaphore例子
* @author: mf
* @create: 2020/01/09 15:35
*/
public class T32 {
// 请求的数量
private static final int threadCount = 20;
public static void main(String[] args) {
ExecutorService service = Executors.newFixedThreadPool(10);
// 一次只能允许执行的线程数量
final Semaphore semaphore = new Semaphore(5);
for (int i = 0; i < threadCount; i++) {
final int threadNum = i;
service.execute(() -> {
try {
semaphore.acquire(); // 获取一个许可，所以可运行线程数量为5/1=5
Thread.sleep(1000);
System.out.println("threadNum: " + threadNum);
Thread.sleep(1000);
semaphore.release(); // 释放一个许可
} catch (InterruptedException e) {
e.printStackTrace();
}
});
}
service.shutdown();
System.out.println("finish...");
}
}