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();
			}
		}
}

执行结果:helloworld