线程池的实现-优快云博客

本文链接：https://blog.youkuaiyun.com/wangshi_langge/article/details/102767246

本文详细介绍了Java中线程池的使用方法，包括创建不同类型的线程池，如缓存线程池、固定线程池和单一线程池。通过实例展示了如何提交任务并获取返回值，以及如何使用匿名内部类提交任务。最后，文章还讲解了如何正确关闭线程池。

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package com.bb;

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;

/**
* 线程池的实现方式
* @author lang
*
*/
public class ExecutorServiceDemo {

   public static void main(String[] args) throws InterruptedException, ExecutionException {
       //创建一个缓存线程池
   // ExecutorService ex = Executors.newCachedThreadPool();
   //创建容量为四个线程的线程池
   ExecutorService threadPool = Executors.newFixedThreadPool(4);
   //创建一个线程的线程池
   // ExecutorService newSingleThreadExecutor = Executors.newSingleThreadExecutor();

   threadPool.submit(new MyThread());
   threadPool.submit(new MyRunnable());
   //实现Callable有返回值
   Future<Integer> submit = threadPool.submit(new MyCallable());
   Integer result = submit.get();
   System.out.println("接收的返回值和为"+result);

   //匿名内部类的方式
   threadPool.submit(new Runnable() {

       public void run() {
           for (int i = 0; i <50; i++) {
               System.out.println(Thread.currentThread().getName()+"-Runnable-"+i);
           }
       }

   });
   //关闭线程池
   threadPool.shutdown();
   }
}

//继承Thread
class MyThread extends Thread{
   @Override
   public void run() {
       for (int i = 0; i <50; i++) {
           System.out.println(Thread.currentThread().getName()+"-MyThread-"+i);
       }
   }
}

//实现Runalbe 没有返回值
class MyRunnable implements Runnable{

public void run() {

for (int i = 0; i <50; i++) {
       System.out.println(Thread.currentThread().getName()+"-myRunable-"+i);
   }

   }
}

//实习Callable接口有返回值，能声明异常
class MyCallable implements Callable<Integer>{

   public Integer call() throws Exception {
       int sum = 0;
       for (int i = 0; i <50; i++) {
           System.out.println(Thread.currentThread().getName()+"-MyCallable-"+i);
           sum += i;
       }
       return sum;
   }

}