JAVA线程池的使用

package com.word.test;

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

public class ThreadTest {

	
	public static void main(String[] args) {
		//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
		ExecutorService cache = Executors.newCachedThreadPool();
		for(int i = 0; i<10; i++) {
			int index = i;
			cache.execute(()->System.out.println(index));
		}
		cache.shutdown();
		//创建一个定长线程池，可控制线程最大并发数，超出的线程会在队列中等待
		ExecutorService fix = Executors.newFixedThreadPool(2);
		for(int i = 0; i<10; i++) {
			int x = i;
			fix.execute(()->{
				try {
					Thread.sleep(500);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				System.out.println(x);	
			});
		}
		fix.shutdown();		
	
		//创建一个定长线程池，支持定时及周期性任务执行
		//延迟1秒执行
		ScheduledExecutorService  sche = Executors.newScheduledThreadPool(5);
		sche.schedule(()->System.out.println("ok"), 1, TimeUnit.SECONDS);
		sche.shutdown();
		//延迟1秒，每3秒执行一次
		ScheduledExecutorService  sche1 = Executors.newScheduledThreadPool(5);
		sche1.scheduleAtFixedRate(()->System.out.println("test"), 1,3, TimeUnit.SECONDS);
		
	}
}