private boolean isHexChar(final char c) {
      return ((c >= 'a') && (c <= 'f')) || ((c >= 'A') && (c <= 'F')) || ((c >= '0') && (c <= '9'));
    }
Tests whether a character is a valid hex input value.

@param c The character to test.
@return True, if the character is a valid hex input value. False, otherwise.
java/zylib/src/main/java/com/google/security/zynamics/zylib/gui/JRegisterView/JRegisterView.java