//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;
    		}
    	}
    }</code></pre>



 
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