• 2022-10-04
宇哥博客 后端开发 Java线程池Executors.newFixedThreadPool例子

Java线程池Executors.newFixedThreadPool例子

//private final static Executor executor = Executors.newCachedThreadPool();// 启用多线程
	private final static ExecutorService  executor = Executors.newFixedThreadPool(5);//创建5个线程
	public void test(){
		
		long startTime = System.currentTimeMillis();
		
		for (int i = 0; i < 50; i++) {
            final int j = i;
            executor.execute(new Runnable() {
                @Override
                public void run() {
                    try {
                    	Thread.sleep(500);
                        System.out.println("*************" + j +"***"+ Thread.currentThread().getName());
                    } catch (Exception e) {
 
                    }
                }
            });
 
        }
		
		executor.shutdown();
		System.out.println("======程序开始启动,我就会执行=====");
		
		while(true){
			if(executor.isTerminated()){
				long end = System.currentTimeMillis();
				System.out.println("======线程全部结束执行=====耗时:" + (end - startTime) + "ms" );
				break;
			}
		}
	}

运行结果:

======程序开始启动,我就会执行=====
*************4***pool-1-thread-5
*************0***pool-1-thread-1
*************3***pool-1-thread-4
*************2***pool-1-thread-3
*************1***pool-1-thread-2
*************5***pool-1-thread-5
*************6***pool-1-thread-1
*************7***pool-1-thread-4
*************8***pool-1-thread-3
*************9***pool-1-thread-2
*************12***pool-1-thread-4
*************11***pool-1-thread-1
*************10***pool-1-thread-5
*************14***pool-1-thread-2
*************13***pool-1-thread-3
*************18***pool-1-thread-2
*************19***pool-1-thread-3
*************15***pool-1-thread-4
*************16***pool-1-thread-1
*************17***pool-1-thread-5
*************20***pool-1-thread-2
*************22***pool-1-thread-4
*************23***pool-1-thread-1
*************24***pool-1-thread-5
*************21***pool-1-thread-3
*************28***pool-1-thread-5
*************27***pool-1-thread-1
*************26***pool-1-thread-4
*************29***pool-1-thread-3
*************25***pool-1-thread-2
*************33***pool-1-thread-3
*************30***pool-1-thread-5
*************31***pool-1-thread-1
*************32***pool-1-thread-4
*************34***pool-1-thread-2
*************36***pool-1-thread-5
*************37***pool-1-thread-1
*************38***pool-1-thread-4
*************35***pool-1-thread-3
*************39***pool-1-thread-2
*************40***pool-1-thread-5
*************41***pool-1-thread-1
*************42***pool-1-thread-4
*************43***pool-1-thread-3
*************44***pool-1-thread-2
*************48***pool-1-thread-3
*************45***pool-1-thread-5
*************46***pool-1-thread-1
*************47***pool-1-thread-4
*************49***pool-1-thread-2
======线程全部结束执行=====耗时:5003ms
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