如何控制某个方法允许并发访问线程的个数

import java.util.concurrent.Semaphore;

/**
 * 如何控制某个方法允许并发访问线程的个数
 * permits the initial number of permits available. This value may be negative,
 * in which case releases must occur before any acquires will be granted.
 * fair true if this semaphore will guarantee first-in first-out granting of
 * permits under contention, else false
 */
public class SemaphoreTest {
    static Semaphore semaphore = new Semaphore(5, true);

    public static void main(String[] args) {
        for (int i = 0; i < 100; i++) {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    test();
                }
            }).start();
        }
    }

    public static void test() {
        try {
            //申请一个新的请求
            semaphore.acquire();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(Thread.currentThread().getName()+"进来了");
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(Thread.currentThread().getName()+"走了");
        //释放一个请求
        semaphore.release();
    }
}

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