黑马程序员_java 线程池

最新推荐文章于 2025-12-17 19:02:04 发布

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本文深入解析Java线程池的实现与应用，包括固定大小线程池、单任务线程池和延迟连接池的概念与实例。详细介绍了如何创建并使用这些线程池，以及它们在不同场景下的优势与适用性。

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固定大小的线程池

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

/** 
* Java线程：线程池- 
* 
* @author Administrator 2009-11-4 23:30:44 
*/ 
publicclass Test {
        publicstaticvoid main(String[] args) {
                //创建一个可重用固定线程数的线程池
                ExecutorService pool = Executors.newFixedThreadPool(2); 
                //创建实现了Runnable接口对象，Thread对象当然也实现了Runnable接口
                Thread t1 = new MyThread();
                Thread t2 = new MyThread();
                Thread t3 = new MyThread();
                Thread t4 = new MyThread();
                Thread t5 = new MyThread();
                //将线程放入池中进行执行
                pool.execute(t1); 
                pool.execute(t2); 
                pool.execute(t3); 
                pool.execute(t4); 
                pool.execute(t5); 
                //关闭线程池
                pool.shutdown(); 
        } 
} 

class MyThread extends Thread{ 
        @Override 
        publicvoid run() {
                System.out.println(Thread.currentThread().getName()+"正在执行。。。");
        } 
}

单任务线程池


在上例的基础上改一行创建pool对象的代码为：
//创建一个使用单个 worker线程的 Executor，以无界队列方式来运行该线程。
ExecutorService pool = Executors.newSingleThreadExecutor();

延迟连接池

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

/** 
* Java线程：线程池- 
* 
* @author Administrator 2009-11-4 23:30:44 
*/ 
publicclass Test {
        publicstaticvoid main(String[] args) {
                //创建一个线程池，它可安排在给定延迟后运行命令或者定期地执行。
                ScheduledExecutorService pool = Executors.newScheduledThreadPool(2);
                //创建实现了Runnable接口对象，Thread对象当然也实现了Runnable接口
                Thread t1 = new MyThread();
                Thread t2 = new MyThread();
                Thread t3 = new MyThread();
                Thread t4 = new MyThread();
                Thread t5 = new MyThread();
                //将线程放入池中进行执行
                pool.execute(t1); 
                pool.execute(t2); 
                pool.execute(t3); 
                //使用延迟执行风格的方法
                pool.schedule(t4, 10, TimeUnit.MILLISECONDS); 
                pool.schedule(t5, 10, TimeUnit.MILLISECONDS); 
                //关闭线程池
                pool.shutdown(); 
        } 
} 

class MyThread extends Thread { 
        @Override 
        publicvoid run() {
                System.out.println(Thread.currentThread().getName() + "正在执行。。。");
        } 
}

自定义线程池

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

/** 
* Java线程：线程池-自定义线程池
* 
* @author Administrator 2009-11-4 23:30:44 
*/ 
publicclass Test {
        publicstaticvoid main(String[] args) {
                //创建等待队列
                BlockingQueue<Runnable> bqueue = new ArrayBlockingQueue<Runnable>(20);
                //创建一个单线程执行程序，它可安排在给定延迟后运行命令或者定期地执行。
                ThreadPoolExecutor pool = new ThreadPoolExecutor(2,3,2,TimeUnit.MILLISECONDS,bqueue);
                //创建实现了Runnable接口对象，Thread对象当然也实现了Runnable接口
                Thread t1 = new MyThread();
                Thread t2 = new MyThread();
                Thread t3 = new MyThread();
                Thread t4 = new MyThread();
                Thread t5 = new MyThread();
                Thread t6 = new MyThread();
                Thread t7 = new MyThread();
                //将线程放入池中进行执行
                pool.execute(t1); 
                pool.execute(t2); 
                pool.execute(t3); 
                pool.execute(t4); 
                pool.execute(t5); 
                pool.execute(t6); 
                pool.execute(t7); 
                //关闭线程池
                pool.shutdown(); 
        } 
} 

class MyThread extends Thread { 
        @Override 
        publicvoid run() {
                System.out.println(Thread.currentThread().getName() + "正在执行。。。");
                try {
                        Thread.sleep(100L); 
                } catch (InterruptedException e) {
                        e.printStackTrace(); 
                } 
        } 
}