java 使用Callable和Future返回线程执行的结果

我们可能在某些特殊的需求下需要返回一个线程执行的结果,在java 1.5提供了Callable和Futrue就能帮你实现!不解释看代码

package cn.kge.com;

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 Demo2 {
        public static void main(String[] args) {
             ExecutorService threadPool = Executors.newSingleThreadExecutor();

             Future<String> future = threadPool.submit(new Callable<String>() {
                 public String call(){
                     String str = "hello";
                     try {
                        Thread.sleep(2000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                     return str+"world";
                 }
            });
             try {
                System.out.println("执行结果:"+future.get());
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (ExecutionException e) {
                e.printStackTrace();
            }
        }
}