Java Math類

標籤：絕對值   logs   隨機數   color   out   bsp   返回   and   四捨五入   

 1 package demo04; 2  3 //Math類所有方法都是靜態方法,直接類名調用 4 public class MathDemo { 5     public static void main(String[] args) { 6          7         //static int abs(int a) 返回 int 值的絕對值  8         System.out.println(Math.abs(-1));            //1 9         10         //static double ceil(double a) 向上取整11         System.out.println(Math.ceil(5.1));          //6.012         13         //static double floor(double a) 向下取整14         System.out.println(Math.floor(5.1));         //5.015         16         //static double pow(double a, double b) a的b次方17         System.out.println(Math.pow(2, 3));          //8.018         19         //static double sqrt(double a) 開方20         System.out.println(Math.sqrt(4));            //2.021         22         //static double random() 隨機數[0.0,1.0)23         System.out.println(Math.random());24         25         //static long round(double a) 四捨五入取整26         System.out.println(Math.round(1.5));         //227          28     }29 }30         

 

Java Math類