java常用类之Random

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package com.Lucky.OftenClass;   import java.util.Random;   /**  * Random :随机类  *  *  注意点：Math.Random()底层调用的是Random的nextDouble方法  */ public class RandomClass {     public static void main(String[] args) {         Random random=new Random();           //遍历10个随机数         for (int i = 0; i < 10; i++) {             //System.out.print(random.nextInt(11)+10+"\t");//10~20             //System.out.print(random.nextInt((20)));//0~20             System.out.println(Math.ceil(random.nextDouble()));         }     } }