Callable拿到线程执行结果

package com.ygl;


import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;


public class CallableAndFuture {
public static void main(String[] args) {
   ExecutorService threadPool= Executors.newSingleThreadExecutor();
   Future<String> future= threadPool.submit(new Callable<String>(){
          public String call(){
         try {
Thread.sleep(2000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
          return "hello";
          }
  
  
   });
   try {
 System.out.println(future.get());  
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}