Introduction to thread pool

Code implementation

package  Thread pool ;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingDeque;

/** * @author: fs * @date: 2022/4/20 14:45 * @Description: */
public class MyThreadPool {
    
    // 1． Describe a task ． Use it directly  Runnable, There is no need to create additional classes ．
    // 2． Use a data structure to organize several tasks .
    private BlockingQueue<Runnable> queue = new LinkedBlockingDeque<>();
    //3． Describe a thread , The function of a worker thread is to take a task from a task queue and execute it ．

    static class Worker extends Thread {
    
        // There are several threads in the current thread pool  worker  Threads ~~ The above task queues are held inside these threads .
        private BlockingQueue<Runnable> queue = null;

        public Worker(BlockingQueue<Runnable> queue) {
    
            this.queue = queue;
        }

        @Override
        public void run() {
    
            // You need to be able to get to the queue above 
            while (true) {
    
                try {
    
                    // Cycle to get the tasks in the task queue .
                    // Here, if the queue is empty , Just block ． If the queue is not empty , Just get the content inside ·
                    Runnable runnable = queue.take();
                    // After acquisition , Just carry out the task .
                    runnable.run();
                } catch (InterruptedException e) {
    
                    e.printStackTrace();
                }
            }
        }
    }

    // 4． Create a data structure to organize several threads .
    public List<Thread> workers = new ArrayList<>();

    public MyThreadPool(int n) {
    
        // In the constructor , Create several threads , Put it in the above array ．
        for (int i = 0; i < n; i++) {
    
            Worker worker = new Worker(queue);
            worker.start();
            workers.add(worker);
        }
    }

    // 5． Create a method , It allows programs to put tasks into the thread pool .
    public void submit(Runnable runnable) {
    
        try {
    
            queue.put(runnable);
        } catch (InterruptedException e) {
    
            e.printStackTrace();
        }
    }

}

class Demo26 {
    
    public static void main(String[] args) {
    
        MyThreadPool pool = new MyThreadPool(10);
        for (int i = 0; i < 100; i++) {
    
            pool.submit(new Runnable() {
    
                @Override
                public void run() {
    
                    System.out.println("hello thneadpool");
                }
            });
        }
    }
}