Method isDigit

src/main/java/com/jdon/util/UtilValidate.java:291–293

Returns true if character c is a digit (0 .. 9).

(char c)

    /** Returns true if character c is a digit (0 .. 9). */
    public static boolean isDigit(char c) {
        return Character.isDigit(c);
    }

    /** Returns true if character c is a letter or digit. */
    public static boolean isLetterOrDigit(char c) {