Math.abs(int a); 예) public class MathAbs { public static void main(String[] args) { int intNum = -1; int intAbs = Math.abs(intNum); System.out.println(intAbs); // 1 long longNum = -1; long longAbs = Math.abs(longNum); System.out.println(longAbs); // 1 double doubleNum = -1.1; double doubleAbs = Math.abs(doubleNum); System.out.println(doubleAbs); // 1.1 float floatNum = -1.1f; float floatAbs = Ma..