【笔记】ExecutorService

package pool;

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

public class PoolDemo {
    public static void main(String[] args) {
//        参数不是初始值,而是最大值
        ExecutorService executorService = Executors.newFixedThreadPool(10);
//        向下转型,因为要使用ThreadPoolExecutor的方法操作线程
        ThreadPoolExecutor pool = (ThreadPoolExecutor) executorService;
        System.out.println(pool.getPoolSize());//0
//          添加线程
        executorService.submit(()->{
            System.out.println(Thread.currentThread().getName()+"hhhhhhh");
        });
        executorService.submit(()->{
            System.out.println(Thread.currentThread().getName()+"hhhhhh");
        });
//        getPoolSize可以获得线程池里面的线程数量
        System.out.println(pool.getPoolSize());//2

    }
}