Java熟悉到陌生之线程之Callable接口

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看一个执行完任务返回一个结果值的例子

package first;import java.util.ArrayList;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;/** *      Runnable接口是独立的工作任务，不返回结果值。Callable接口回返回结果值。 */class Task implements Callable<String>{    private int id;    public Task(int id) {        this.id=id;    }    public String call() throws Exception {        return "id-->"+id;    }}public class Demo04 {    public static void main(String[] args) {        ExecutorService executorService=Executors.newCachedThreadPool();        ArrayList<Future<String>> list=new ArrayList<Future<String>>();        for(int i=0;i<5;i++)            //submit返回Future            list.add(executorService.submit(new Task(i)));        for (Future<String> future : list) {            try {                System.out.println(future.get());            } catch (InterruptedException | ExecutionException e) {                System.out.println(e);                return;            }finally{                executorService.shutdown();            }        }    }}id-->0id-->1id-->2id-->3id-->4

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