1、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。

public static void main(String[] args) {ExecutorService cachedThreadPool = Executors.newCachedThreadPool();for (int i = 0; i < 10; i++) {final int index = i;cachedThreadPool.execute(() -> {System.out.println("Thread.currentThread().getName() = " + Thread.currentThread().getName());});}}

2、创建一个固定线程数量，可重用的线程池。

public static void main(String[] args) {ExecutorService fixedThreadPool = Executors.newFixedThreadPool(2);for (int i = 0; i < 10; i++) {final int index = i;fixedThreadPool.execute(() -> {System.out.println("Thread.currentThread().getName() = " + Thread.currentThread().getName());});}}

3、创建一个指定最多线程数量的线程池。

package com.controller;import com.myThread.AdminThread;
import com.myThread.MyCallable;
import com.myThread.MyRunnable;
import org.springframework.web.bind.annotation.*;import java.util.concurrent.*;@RestController
@CrossOrigin
@RequestMapping("/admin")
public class AdminController{@GetMapping("/{id}")public long findById(@PathVariable Long id) throws InterruptedException {ExecutorService executorService = Executors.newFixedThreadPool(3);ThreadPoolExecutor pool = (ThreadPoolExecutor) executorService;System.out.println(pool.getPoolSize());//0for (int i = 0; i < 10; i++) {executorService.submit(()->{System.out.println(Thread.currentThread().getName() + "在执行了");});}return id;}
}