Semaphore demo

SemaphoreTest.java

package org.nkcoder.module.javatest.concurrent;

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

/**
 * created by daniel at 12/16/16 08:33
 */
public class SemaphoreTest {

    public static void main(String[] args) {
        final Semaphore semaphore = new Semaphore(10);

        for (int i = 0; i < 20; i++) {
            new Thread(() -> {
                try {
                    System.out.println("thread: " + Thread.currentThread().getName() + " start...");
                    semaphore.acquire();
                    System.out.println("thread: " + Thread.currentThread().getName() + " process...");
                    TimeUnit.SECONDS.sleep(3);
                } catch (Exception e) {
                    System.out.println(e);
                    Thread.currentThread().interrupt();
                } finally {
                    semaphore.release();
                }
                System.out.println("thread: " + Thread.currentThread().getName() + " finish...");
            }).start();
        }
    }
}