java 并发库 Future 和 Collable的使用

package endual;

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 MainApp {

?/**
? * @param args
? */
?public static void main(String[] args) {

??ExecutorService threadPool = Executors.newSingleThreadExecutor() ;
??Future<String> fu = threadPool.submit(new Callable<String>() {
???public String call() throws Exception {
????// TODO Auto-generated method stub
????return "Hello" ;
???}
??}) ;
??String msg = null ;
??try {
??? msg = fu.get() ;
??} catch (InterruptedException e) {
???// TODO Auto-generated catch block
???e.printStackTrace();
??} catch (ExecutionException e) {
???// TODO Auto-generated catch block
???e.printStackTrace();
??}
??System.out.println(msg);
?}

}

?