숫자만 입력되었는지 체크하기

public static boolean isIntegerNumeric(String s) {
  try {
    Integer.parseInt(s);
    return true;
  } catch(NumberFormatException e) {
    return false;
  }
}

public static boolean isDoubleNumeric(String s) {
  try {
    Double.parseDouble(s);
    return true;
  } catch(NumberFormatException e) {
    return false;
  }
}

public static boolean isFloatNumeric(String s) {
  try {
    Float.parseFloat(s);
    return true;
  } catch(NumberFormatException e) {
    return false;
  }
}

활용 방법

if (isIntegerNumeric(String) == false) {
  logger.info("숫자만 입력 가능");
}