java多线程之从任务中获取返回值

package wzh.test;

import java.util.ArrayList;

import java.util.concurrent.Callable;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.Future;
class TaskWithResult implements Callable<String>{

    private int id;

    public TaskWithResult(int id){

        this.id=id;

    }

    @Override

    public String call() throws Exception {

        return "result of TaskWithResult "+id;

    }

}
public class CallableDemo {

    public static void main(String[] args) {

        ExecutorService exec=Executors.newCachedThreadPool();

        ArrayList<Future<String>> results=new ArrayList<Future<String>>();

        for (int i = 0; i < 10; i++) {

            results.add(exec.submit(new TaskWithResult(i)));

        }

        for (Future<String> future : results) {

            try {

                System.out.println(future.get());

            } catch (Exception e) {

                e.printStackTrace();

            }

            finally{

                exec.shutdown();

            }

        }

    }

}

java多线程之从任务中获取返回值