newCachedThreadPool，缓存池

Executors.newCachedThreadPool();

无限制创建线程。

package com.itcast.thread;

import java.time.LocalDateTime;
import java.util.PrimitiveIterator;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * @Description
 * @Author by mocar小师兄
 * @Date 2019/11/29 12:22
 **/
public class NewCachedThreadPool {
    public static void main(String[] args) {
        ExecutorService cachedThreadPool = Executors.newCachedThreadPool();
        for (int index = 0; index <5 ; index++) {
            //final int index=num;
            System.out.println("循环：" + index + "开始");
            cachedThreadPool.execute(() -> {
                LocalDateTime startTime = LocalDateTime.now();
                System.out.println(Thread.currentThread().getName() + "......开始执行");
                try {
                    Thread.sleep(500);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName() + "......执行完成");
                LocalDateTime endTime = LocalDateTime.now();
                System.out.println(Thread.currentThread().getName() +"，耗时:" + (endTime.getSecond()-startTime.getSecond()));
            });
            System.out.println("循环：" + index + "结束");
        }
        cachedThreadPool.shutdown();
        System.out.println("thread main 结束");
    }

}