1package cn.cccc.demo;2class MathUtil{3 private MathUtil(){};4 5 public static double round(double num, int scale){6 return Math.round(num * Math.pow(10, scale)) / Math.pow(10, scale);7 }8}9public class ThreadDemo {10 public static void main(String[] args) throws Exception{11 System.out.println(MathUtil.round(19.46735, 2));12 }13}