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If I have three classes
class A
class B extends A
class C extends A
Would using abstract classes or interfaces give me any type of errors or affect the way I implement the program?
Unless you need to share implementation, favor interfaces.
If you need to share implementation, think carefully if an abstract class is the right way to accomplish this.
Inheritance is a powerful tool, but can easily create an unmaintainable mess (I have been guilty here).
But to answer your question – no, there is nothing inherent in this setup that would cause an “error”.