code: public boolean isPreviousThan(Node node) {
          if (getEndLine() < node.getBeginLine()) {
              return true;
          } else if ((getEndLine() == node.getBeginLine()) && (getEndColumn() <= node.getBeginColumn())) {
              return true;
          }
          return false;
      }
docs: Return if this node is previous than another one according their line and column numbers
  
  @param node
  to compare
  @return if this node is previous than another one according their line and