ExecutorService.execute(Runnable x) 判断是否完成,得到返回值

public class RunnableTestMain { public static void main(String[] args) {
ExecutorService pool = Executors.newFixedThreadPool(2); /**
* execute(Runnable x) 没有返回值。可以执行任务，但无法判断任务是否成功完成。
*/
pool.execute(new RunnableTest("Task1")); /**
* submit(Runnable x) 返回一个future。可以用这个future来判断任务是否成功完成。请看下面：
*/
Future future = pool.submit(new RunnableTest("Task2")); try {
if(future.get()==null){//如果Future's get返回null，任务完成
System.out.println("任务完成");
}
} catch (InterruptedException e) {
} catch (ExecutionException e) {
//否则我们可以看看任务失败的原因是什么
System.out.println(e.getCause().getMessage());
} }}public class RunnableTest implements Runnable { private String taskName; public RunnableTest(final String taskName) {
this.taskName = taskName;
} @Override
public void run() {
System.out.println("Inside "+taskName);
throw new RuntimeException("RuntimeException from inside " + taskName);
}}