多线程执行任务等待所有任务执行完毕

@Test
public void testMultiThread(){
try {
final CountDownLatch countDownLatch = new CountDownLatch(2);//计数器
ExecutorService executorService = Executors.newCachedThreadPool();
Future<Boolean> work1 =  executorService.submit(new Callable<Boolean>() {
@Override
public Boolean call() throws Exception {
System.out.println("线程1开始执行..........");
Thread.sleep(5000);
System.out.println("线程1执行完了............");
countDownLatch.countDown();
return true;
}
});
Future<Boolean> work2 = executorService.submit(new Callable<Boolean>() {
@Override
public Boolean call() throws Exception {
System.out.println("线程2开始执行..........");
Thread.sleep(5000);
System.out.println("线程2执行完了............");
countDownLatch.countDown();
return true;
}
});
Boolean work1Flag =  work1.get();//线程1返回值
Boolean work2Flag = work2.get();//线程2返回值
System.out.println("运行结果：线程1=" + work1Flag + "线程2=" + work2Flag);
countDownLatch.await();
System.out.println("执行结束");
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}

执行结果如下：

线程1开始执行..........

线程2开始执行..........

线程2执行完了............

线程1执行完了............

运行结果：线程1=true线程2=true

执行结束