i got a question regarding to the class hierarchy of Cell and the possibility to implement Comparable.
There are HSSFCell implements Cell and XSSFCell implements Cell. I wanted the compareTo functionality for both, hence my idea was to design a class like abstract class MyCell implements Cell, Comparable<Cell>. So i could implement compareTo but omit the Cell functions. The problem is that MyCell is not a Cell. Available options: 1.) always cast if a Cell is needed 2.) extend HSSFCell as well as XSSFCell and implement Comparable for both. Are there more options?
Another option would be to forget about making a Cell comparable; you can compare a MyCell object to an XSSFCell object, because you wrote the code for MyCell, but you can't compare an XSSFCell object to a MyCell object because you didn't write the code for XSSFCell. A Comparator might be a better idea.