多线程之线程池的两种使用方法

代码:

package com.qiu.syn;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

//测试线程池
public class TestPool {
    public static void main(String[] args) {
        //1.创建线程池,创建服务
        //newFixedThreadPool 参数为线程池大小
        ExecutorService service = Executors.newFixedThreadPool(10);
        //执行
        service.execute(new MyThread());
        service.execute(new MyThread());
        service.execute(new MyThread());
        service.execute(new MyThread());

​        //关闭连接

​        service.shutdown();
​    }
}
class MyThread implements Runnable{

​    @Override
​    public void run() {
​        for (int i = 0; i < 100; i++) {
​            System.out.println(Thread.currentThread().getName()+":"+i);
​        }
​    }
}

Callable需要用submit执行:

package com.qiu.demo02;

import com.qiu.demo01.TestThread02;
import com.qiu.demo01.webDownloader;


import java.util.concurrent.*;


//练习thread,实现多线程同步下载图片
    public class TestCallable implements Callable<Boolean> {
        private String url;//网络图片地址
        private String name;//保存的文件名
        public TestCallable(String url,String name){
            this.name=name;
            this.url=url;
        }
        @Override
        //线程的执行体
        public Boolean call() {
            webDownloader webDownloader = new webDownloader();
            webDownloader.downloader(url,name);
            System.out.println("下载的文件名为" +name);
            return true;
        }
        public static void main(String[] args) throws ExecutionException, InterruptedException {
            TestCallable testCallable = new TestCallable("https://ww1.sinaimg.cn/bmiddle/006cNziigy1ge44slsqkuj31400u0tc1.jpg","1.jpg");
            TestCallable testCallable1 = new TestCallable("https://ww1.sinaimg.cn/bmiddle/006cNziigy1ge44slsqkuj31400u0tc1.jpg","2.jpg");
            TestCallable testCallable2 = new TestCallable("https://ww1.sinaimg.cn/bmiddle/006cNziigy1ge44slsqkuj31400u0tc1.jpg","3.jpg");

​            //创建执行服务
​            ExecutorService ser = Executors.newFixedThreadPool(3);
​            //提交查询 对比Run方法
​            Future<Boolean> result1 = ser.submit(testCallable);
​            Future<Boolean> result2 = ser.submit(testCallable1);
​            Future<Boolean> result3 = ser.submit(testCallable2);
​            //获取结果
​            Boolean r1 = result1.get();
​            Boolean r2 = result2.get();
​            Boolean r3 = result3.get();
​            //关闭服务
​            ser.shutdown();
​        }
​    }