java future 同步_java中future 接口 异步转为同步例子

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 TestFuture {

public static void main(String args[]){

System.out.println("hello world");

ExecutorService es = Executors.newCachedThreadPool();

Future fu = es.submit(new Callable(){

@Override

public String call() throws Exception {

Thread.sleep(10000); // remove it if return directly , but future still works

return "hello world";

}

});

System.out.println("hello world1111111111");

String result = "";

try {

System.out.println("hello world222222");

result = fu.get();

System.out.println("hello world3333333");

} catch (InterruptedException | ExecutionException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

System.out.println(result);

es.shutdown(); // shutdown the executor

}

}