[多线程]创建多线程的方式四：使用线程池

/**
 * 创建线程的方式四：使用线程池
 *
 * 思路：
 * 提前创建好多个线程，放入线程池中，使用时直接获取，使用完放回池中。可以避免频繁
 * 创建销毁、实现重复利用
 *
 * 好处：
 * 1. 提高响应速度(减少了创建新线程的时间)
 * 2. 降低资源消耗（重复利用线程池中线程，不需要每次都创建）
 * 3. 便于线程管理
 *    corePollSize:核心池的大小
 *    maximumPoolSize:最大线程数
 *    keepAliveTime:线程没有任务时最多保持多长时间后会终止
 * @author rjn
 * @create 04-21 23:24
 */

class NumberThread implements Runnable{

    @Override
    public void run() {
        for (int i = 0;i <= 100;i++){
            if (i % 2 == 0){
                System.out.println(Thread.currentThread().getName() + ":" + i);
            }
        }
    }
}

class NumberThread1 implements Runnable{

    @Override
    public void run() {
        for (int i = 0;i <= 100;i++){
            if (i % 2 != 0){
                System.out.println(Thread.currentThread().getName() + ":" + i);
            }
        }
    }
}
public class ThreadPool {
    public static void main(String[] args) {
        //1. 提供指定线程数量的线程池
        ExecutorService service = Executors.newFixedThreadPool(10);
        ThreadPoolExecutor service1 = (ThreadPoolExecutor) service;

        //设置线程池的属性
        System.out.println(service.getClass());
        service1.setCorePoolSize(15);
//        service1.setKeepAliveTime();



        //2. 执行指定的线程的操作 需要提供实现Runnable接口或Callable接口实现类的对象
        service.execute(new NumberThread());//适合使用于Runnable
        service.execute(new NumberThread1());//适合使用于Runnable

//      service.submit(Callable callable);//适合使用于Callable

        //3. 关闭连接池
        service.shutdown();
    }
}

class java.util.concurrent.ThreadPoolExecutor
pool-1-thread-1:0
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