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Java Java Data Structures - Retired Organizing Data Interfaces

Posted by Truxton Stevens
Truxton Stevens
28,536 Points

Calling compareTo() within the new @Override compareTo()?

I can see that calling compareTo() within the new method of @Override compareTo() works, but don't really understand the scope on this. Do we have access to both compareTo() methods afterwards. Is there a case where this matters? Any thoughts?

2 Answers

Stefan Plötz
Stefan Plötz
6,237 Points

I think the @Override is overwriting the compareTo method for the class it is overriding in so you can still call the compareTo method for Strings as usual. We're simply telling java that if we want to compare objects of this class we compare it our way (via the mDescription comparison which is a String comparison and the Date comparison which compares its long values). So we're basically setting up a custom comparison for our object according to our understanding.

Truxton Stevens
Truxton Stevens
28,536 Points

Cool, guess that sort of makes a bit more sense! Cheeers!

Jonathan Grieve
MOD
Jonathan Grieve
Treehouse Moderator 91,253 Points
Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,253 Points

My understanding is all @Override does is inform the compiler that you're changing the default behaviour of the compareTo() method. You can access it because you inherit the method from the interface. So unless I'm mistaken you don't have to use or access it more than the once.