Method isSignedLong

src/main/java/com/jdon/util/UtilValidate.java:353–363

Returns true if all characters are numbers; first character is allowed to be + or - as well. Does not accept floating point, exponential notation, etc.

(String s)

     *  Does not accept floating point, exponential notation, etc.
     */
    public static boolean isSignedLong(String s) {
        if (isEmpty(s)) return defaultEmptyOK;

        try {
            Long.parseLong(s);

            return true;
        } catch (Exception e) {
            return false;
        }
    }

    /** Returns true if string s is an integer > 0. NOTE: using the Java Long object for greatest precision */
    public static boolean isPositiveInteger(String s) {