[java] java.lang.NumberFormatException

NumberFormatException : 요약하면 숫자형식 에러

 

String str = "123";
if (isStringDouble(str))
    System.out.println("숫자입니다.");
else
    System.out.println("숫자가 아닙니다.");
}
 
public static boolean isStringDouble(String s) {
    try {
        Double.parseDouble(s);
        return true;
    } catch (NumberFormatException e) {
        return false;
    }
}

 

출처 : http://mwultong.blogspot.com/2006/12/java-isnum-isdouble.html