Day65.创建多线程的方式四-实现Callable接口与使用线程池方式 -Java多线程-白红宇

Day65.创建多线程的方式四-实现Callable接口与使用线程池方式 -Java多线程

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发布时间：2019-03-04

本文共 2589 字，大约阅读时间需要 8 分钟。

????????????Callable??????????

??Callable??

Callable??????Runnable???????????Runnable??????????????????Callable??????????call???????????????????????????????????????

???Callable??????????????

??????Callable????????????Callable???

??call????call?????????????????????????????

??Callable????????new???????Callable??????

?Callable?????FutureTask?????FutureTask????Callable?????????FutureTask?????

?FutureTask?????Thread????????Thread????FutureTask????????????start()???????

??call?????????FutureTask?get????call?????????????????get???????InterruptedException?ExecutionException???????????????

???????Callable????????

import java.util.concurrent.FutureTask;import java.util.concurrent.Callable;class NumThread implements Callable {    @Override    public Object call() throws Exception {        int sum = 0;        for (int i = 0; i <= 100; i++) {            if (i % 2 == 0) {                System.out.println(i);                sum += i;            }        }        return sum;    }}public class ThreadNew {    public static void main(String[] args) {        NumThread numThread = new NumThread();        FutureTask f = new FutureTask(numThread);        new Thread(f).start();        try {            Object o = f.get();            System.out.println("????" + o);        } catch (InterruptedException e) {            e.printStackTrace();        } catch (ExecutionException e) {            e.printStackTrace();        }    }}

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????????????????????????????????????????????????????

????????????????????????????

?????????????????????????????????????????????

??????????????????????

??????????Executors.newFixedThreadPool(int)?????????????????????

???????executorService.execute(Runnable)????Runnable??????????????Callable???????executorService.submit(Callable)???

????????executorService.shutdown()?????????????

????????????????

import java.util.concurrent.Executors;import java.util.concurrent.ThreadPoolExecutor;class NumberThread implements Runnable {    @Override    public void run() {        for (int i = 0; i <= 100; i++) {            if (i % 2 == 0) {                System.out.println(Thread.currentThread().getName() + ": " + i);            }        }    }}public class ThreadPool {    public static void main(String[] args) {        ExecutorService executorService = Executors.newFixedThreadPool(10);        executorService.execute(new NumberThread());        executorService.execute(new NumberThread());        executorService.shutdown();    }}