Java多线程测试执行时长

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    @Test  
    public void testIdWorker() throws InterruptedException {  
        int threadCount = 300;  
        //latch.await()等待300个线程都执行完成countDown后,才能继续执行  
        CountDownLatch latch = new CountDownLatch(threadCount);  
  
        Runnable task = ()-> {  
            for (int i = 0; i < 100; i++) {  
                long l = redisIdWorker.nextId("order");  
                System.out.println(l);  
            }  
            // 每个任务都要countDown  
            latch.countDown();  
        };  
        long begin = System.currentTimeMillis();  
        for (int i = 0; i < threadCount; i++) {  
            es.submit(task);  
        }  
        latch.await();  
        long end = System.currentTimeMillis();  
        System.out.println("time=" + (end-begin));  
    }  
}