Java中Math类常用方法代码详解

近期用到四舍五入想到以前整理了一点，就顺便重新整理好经常见到的一些四舍五入，后续遇到常用也会直接在这篇文章更新。。。

public class Demo{  public static void main(String args[]){          System.out.println(Math.sqrt(16));  //4.0     System.out.println(Math.cbrt(8));  //2.0    System.out.println(Math.pow(3,2));   //9.0    System.out.println(Math.max(2.3,4.5));//4.5    System.out.println(Math.min(2.3,4.5));//2.3         System.out.println(Math.abs(-10.4));  //10.4     System.out.println(Math.abs(10.1));   //10.1          System.out.println(Math.ceil(-10.1));  //-10.0     System.out.println(Math.ceil(10.7));  //11.0     System.out.println(Math.ceil(-0.7));  //-0.0     System.out.println(Math.ceil(0.0));   //0.0     System.out.println(Math.ceil(-0.0));  //-0.0     System.out.println(Math.ceil(-1.7));  //-1.0         System.out.println(Math.floor(-10.1)); //-11.0     System.out.println(Math.floor(10.7));  //10.0     System.out.println(Math.floor(-0.7));  //-1.0     System.out.println(Math.floor(0.0));  //0.0     System.out.println(Math.floor(-0.0));  //-0.0          System.out.println(Math.random()); //小于1大于0的double类型的数    System.out.println(Math.random()*2);//大于0小于1的double类型的数    System.out.println(Math.random()*2+1);//大于1小于2的double类型的数         System.out.println(Math.rint(10.1));  //10.0     System.out.println(Math.rint(10.7));  //11.0     System.out.println(Math.rint(11.5));  //12.0     System.out.println(Math.rint(10.5));  //10.0     System.out.println(Math.rint(10.51));  //11.0     System.out.println(Math.rint(-10.5));  //-10.0     System.out.println(Math.rint(-11.5));  //-12.0     System.out.println(Math.rint(-10.51)); //-11.0     System.out.println(Math.rint(-10.6));  //-11.0     System.out.println(Math.rint(-10.2));  //-10.0          System.out.println(Math.round(10.1));  //10     System.out.println(Math.round(10.7));  //11     System.out.println(Math.round(10.5));  //11     System.out.println(Math.round(10.51)); //11     System.out.println(Math.round(-10.5)); //-10     System.out.println(Math.round(-10.51)); //-11     System.out.println(Math.round(-10.6)); //-11     System.out.println(Math.round(-10.2)); //-10   } }