public static String last(final String value,int n){
  validate(value,NULL_STRING_PREDICATE,NULL_STRING_MSG_SUPPLIER);
  if (n > value.length()) {
    return value;
  }
  return value.substring(value.length() - n);
}

public static String last ( final String value , int n ) { validate ( value , NULL_STRING_PREDICATE , NULL_STRING_MSG_SUPPLIER ) ; if ( n > value . length ( ) ) { return value ; } return value . substring ( value . length ( ) - n ) ; }
return the last n chars of string
