Answer
Abstract classes contain shared logic plus abstract methods. Interfaces define method signatures. Interfaces enforce capabilities; abstract classes share implementation.
Quick Answer
Abstract classes can have concrete methods and properties, and are extended with extends. Interfaces only define method signatures, implemented with implements. A class can implement multiple interfaces but extend only one abstract class. Use abstract class for shared base behavior. Use interface for defining a contract that multiple unrelated classes should follow.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ