java线程几个重要概念(线程池）

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

public class ThreadPoolDemo {
    public static void main(String[] args) {
        ExecutorService es = Executors.newFixedThreadPool(2); //创建了两个线程对象

        es.submit(new Runable1()); //es.submit（需要执行的某个线程中的run方法中的内容)
        es.submit(new Runable1());
        es.submit(new Runable1());
    }
}

//执行结果   始终就两个线程 因为线程池就只创建了2个
//pool-1-thread-2
//pool-1-thread-2
//pool-1-thread-1

public class Runable1 implements Runnable {

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName());
    }
}