public void outdent(){
  final int length=indent.length();
  if (length == 0) {
    throw new IllegalArgumentException(" Outdent() without matching Indent().");
  }
  indent.delete(length - 2,length);
}

public void outdent ( ) { final int length = indent . length ( ) ; if ( length == 0 ) { throw new IllegalArgumentException ( " Outdent() without matching Indent()." ) ; } indent . delete ( length - 2 , length ) ; }
reduces the current indent level by two spaces , or crashes if the indent level is zero .
