线程池之CachedPool

package src.main.java.com.qqjx.thread;

/*
 * @Auther  wangpeng
 * @Date 2021/2/4
 */

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

public class T08_CachedPool {
    public static void main(String[] args) throws InterruptedException {
        ExecutorService service = Executors.newCachedThreadPool();
        System.out.println(service);
        for (int i = 0; i < 2; i++) {
            service.execute(() -> {
                try {
                    TimeUnit.MILLISECONDS.sleep(500);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName());
            });
        }
        System.out.println(service);

        TimeUnit.SECONDS.sleep(80);

        System.out.println(service);


    }
}

java.util.concurrent.ThreadPoolExecutor@1540e19d[Running, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]
java.util.concurrent.ThreadPoolExecutor@1540e19d[Running, pool size = 2, active threads = 2, queued tasks = 0, completed tasks = 0]
pool-1-thread-2
pool-1-thread-1

Executors.newCachedThreadPool() 源代码
  public static ExecutorService newCachedThreadPool() {
        return new ThreadPoolExecutor(0, Integer.MAX_VALUE,
                                      60L, TimeUnit.SECONDS,
                                      new SynchronousQueue<Runnable>());
    }