Java Math類
阿新 • • 發佈:2017-05-20
print -1 floor 靜態 8.0 blog 類名 返回 demo
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)); //6.0 12 13 //static double floor(double a) 向下取整 14 System.out.println(Math.floor(5.1)); //5.0 15 16 //static double pow(double a, double b) a的b次方 17 System.out.println(Math.pow(2, 3)); //8.0 18 19 //static double sqrt(double a) 開方20 System.out.println(Math.sqrt(4)); //2.0 21 22 //static double random() 隨機數[0.0,1.0) 23 System.out.println(Math.random()); 24 25 //static long round(double a) 四舍五入取整 26 System.out.println(Math.round(1.5)); //2 27 28 } 29} 30
Java Math類