如何用java设计一个线程池？相信很多新手小白还没学会这个技能，通过这篇文章的总结，希望你能学会用java设计线程池。如下资料是用java设计线程池的步骤。

思路与生产者与消费者模式相同，将任务放到队列中，子线程再从队列中取出任务去执行。

方式一：固定线程池，一开始是就申请好线程。比如：公司一次性雇佣5个工人，往后在接手任务还是这5 个人去做。import java.util.concurrent.ArrayBlockingQueue;import java.util.concurrent.BlockingQueue;public class ThreadPoolV1{ private BlockingQueue<Runnable> workQueue = new ArrayBlockingQueue<>(10);//队列容量为10，大于就阻塞等待。 private Thread[] workers = new Thread[5];//线程的个数即一开始雇佣的工人个数 ThreadPoolV1() { for (int i = 0; i < 5; i++) { workers[i] = new Worker(workQueue); workers[i].start();//5个线程的启动 去完成业务 } } public void execute(Runnable cmd) throws InterruptedException { workQueue.put(cmd);//将任务放到队列中 } private static class Worker extends Thread { private BlockingQueue<Runnable> workQueue; Worker(BlockingQueue<Runnable> queue) { workQueue = queue; } @Override public void run() { while (!isInterrupted()) { try { Runnable cmd = workQueue.take();//从队列中把任务取出来 cmd.run();//业务 } catch (InterruptedException e) { break; } } } } public static void main(String[] args) throws InterruptedException { ThreadPoolV1 pool = new ThreadPoolV1(); pool.execute(new Runnable() { @Override public void run() { while (true) { System.out.println("第一个事情"); } } }); pool.execute(new Runnable() { @Override public void run() { while (true) { System.out.println("第二个时期"); } } }); pool.execute(new Runnable() { @Override public void run() { while (true) { System.out.println("第三 个时期"); } } }); pool.execute(new Runnable() { @Override public void run() { while (true) System.out.println("第四个时期"); } } }); pool.execute(new Runnable() { @Override public void run() { while (true) { System.out.println("第五个时期"); } } }); pool.execute(new Runnable() { @Override public void run() { while (true) { System.out.println("第五个时期"); } } }); }

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方式二：当有任务时雇佣一个工人，再来任务时再雇佣一个工人，一直这样，直到雇佣人数达到预期最大值，再来任务就放到队列中去。

public class ThreadPoolV2 { private BlockingQueue<Runnable> workQueue = new ArrayBlockingQueue<>(10);//队列上大于10个任务时，发生阻塞等待 private int maxThreads = 5; private int currentThreads = 0;//一开始没有线程 private Thread[] works = new Thread[maxThreads]; public void execute(Runnable cmd) throws InterruptedException { if (currentThreads == maxThreads) {//雇佣人数达到最大值 workQueue.put(cmd);//任务放到队列 } else { Worker worker = new Worker(workQueue);//雇佣一个工人 works[currentThreads++] = worker; worker.start(); workQueue.put(cmd); } } private static class Worker extends Thread { private BlockingQueue<Runnable> workQueue; Worker(BlockingQueue<Runnable> queue) { workQueue = queue; } @Override public void run() { while (!isInterrupted()) { try { Runnable cmd = workQueue.take();//从 cmd.run(); } catch (InterruptedException e) { break; } } } }} public static void main(String[] args) throws InterruptedException { ThreadPoolV1 pool = new ThreadPoolV1(); pool.execute(new Runnable() { @Override public void run() { while (true) { System.out.println("第一个事情"); } } }); pool.execute(new Runnable() { @Override public void run() { while (true) { System.out.println("第二个时期"); } } }); pool.execute(new Runnable() { @Override public void run() { while (true) { System.out.println("第三 个时期"); } } }); pool.execute(new Runnable() { @Override public void run() { while (true) { System.out.println("第四个时期"); } } }); pool.execute(new Runnable() { @Override public void run() { while (true) { System.out.println("第五个时期"); } } }); pool.execute(new Runnable() { @Override public void run() { while (true) { System.out.println("第六个时期"); } } }); }}

综上所述，用java设计线程池有两种方式，具体使用还要根据自己情况选择其中一种方式，如果想了解更多相关文章内容或知识，欢迎关注亿速云行业资讯频道。