newCachedThreadPool创建一个可缓存线程池,如果线程池长度超过处理需要,可灵活回收空闲线程,若无可回收,则新建线程。
package com.executor.test;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* @author 作者:wx
* @createDate 创建时间:Sep 16, 2019 2:44:27 PM
*/
public class CachedThreadPoolDemo {
public static void main(String[] args) {
ExecutorService executorService = Executors.newCachedThreadPool();
for (int i = 0; i < 10; i++) {
int temp = i;
executorService.execute(new Runnable() {
@Override
public void run() {
System.out.println(Thread.currentThread().getName() + "," + temp);
}
});
}
}
}
运行结果为:
![](https://img.laitimes.com/img/_0nNw4CM6IyYiwiM6ICdiwiIwczX0xiRGZkRGZ0Xy9GbvNGL2EzXlpXazxSP9cWTxsGRPRTVE9EMRp3YrB3MMBjVtJWd0ckW65UbM5WOHJWa5kHT20ESjBjUIF2X0hXZ0xCMx81dvRWYoNHLrdEZwZ1Rh5WNXp1bwNjW1ZUba9VZwlHdssmch1mclRXY39CXldWYtlWPzNXZj9mcw1ycz9WL49zZwpmLwYzNxETN1QTM2ETOwkTMwIzLc52YucWbp5GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.jpg)
如图只创建了7个线程,其中pool-1-thread-5,pool-1-thread-6,pool-1-thread-7这3个线程重复利用了2次。
总结: 线程池为无限大,当执行第二个任务时第一个任务已经完成,会复用执行第一个任务的线程,而不用每次新建线程。