package ch09utility;public class MathEx { public static void main(String[] args) { //Math math = new Math(); //기본 생성자가 없음. double d1 = -12.3456; double d2 = 34.56; double result = Math.abs(d1); System.out.println("절대값 : "+Math.abs(result)); System.out.println("올림 : "+Math.ceil(d2)); System.out.println("버림 : "+Math.floor(d2)); System.out...