Java多线程返回结果2 FutureTask

import java.util.ArrayList;
import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;

import java.util.concurrent.*;
public class BasicThread {
public static void main(String[] args) {
ExecutorService exc = Executors.newCachedThreadPool();
RuturnedValue valued=new RuturnedValue();
FutureTask<String>task=new FutureTask<String>(valued);
exc.submit(task);
exc.shutdown();
try{
System.out.print(task.get());
}catch (InterruptedException e){
System.out.print(e.getCause());
}catch (ExecutionException e){
System.out.print(e.getCause());
}

}
}
class RuturnedValue implements Callable<String>{
public String call(){
return this.toString();
}

}