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Adding print statements is one way to do it. Another is to use the interactive debugger that many IDEs have.

How are you trying to debug the code? Add some print statements in the method(s) that are not working correctly that print out the values of the variables that they are using so you can see what the...

No.
Why did that class implement the interface if it is not going to implement the needed methods?

That message seems clear enough. Did you put that method in that class?

Note: The code should annotate where it is doing an override by using the @Override statement just before the method...