package cn.itcast_01; /* * Math:用于数学运算的类。 * 成员变量: * public static final double PI * public static final double E * 成员方法: * public static int abs(int a):绝对值 * public static double ceil(double a):向上取整 * public static double floor(double a):向下取整 * public static int max(int a,int b):最大值 (min自学) * public static double pow(double a,double b):a的b次幂 * public static double random():随机数 [0.0,1.0) * public static int round(float a) 四舍五入(参数为double的自学) * public static double sqrt(double a):正平方根 */ public class MathDemo { public static void main(String[] args) { // public static final double PI System.out.println("PI:" + Math.PI); // public static final double E System.out.println("E:" + Math.E); System.out.println("--------------"); // public static int abs(int a):绝对值 System.out.println("abs:" + Math.abs(10)); System.out.println("abs:" + Math.abs(-10)); System.out.println("--------------"); // public static double ceil(double a):向上取整 System.out.println("ceil:" + Math.ceil(12.34)); System.out.println("ceil:" + Math.ceil(12.56)); System.out.println("--------------"); // public static double floor(double a):向下取整 System.out.println("floor:" + Math.floor(12.34)); System.out.println("floor:" + Math.floor(12.56)); System.out.println("--------------"); // public static int max(int a,int b):最大值 System.out.println("max:" + Math.max(12, 23)); // 需求:我要获取三个数据中的最大值 // 方法的嵌套调用 System.out.println("max:" + Math.max(Math.max(12, 23), 18)); // 需求:我要获取四个数据中的最大值 System.out.println("max:" + Math.max(Math.max(12, 78), Math.max(34, 56))); System.out.println("--------------"); // public static double pow(double a,double b):a的b次幂 System.out.println("pow:" + Math.pow(2, 3)); System.out.println("--------------"); // public static double random():随机数 [0.0,1.0) System.out.println("random:" + Math.random()); // 获取一个1-100之间的随机数 System.out.println("random:" + ((int) (Math.random() * 100) + 1)); System.out.println("--------------"); // public static int round(float a) 四舍五入(参数为double的自学) System.out.println("round:" + Math.round(12.34f)); System.out.println("round:" + Math.round(12.56f)); System.out.println("--------------"); //public static double sqrt(double a):正平方根 System.out.println("sqrt:"+Math.sqrt(4)); } }
java Math类用法详解
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