← Exit to Module 7: Advanced Object-Oriented Concepts lessons
Module progress · 0%Lesson · 22 min
Module 7: Advanced Object-Oriented Concepts
Lesson focusAbstract Classes vs Interfaces
Choose the right construct to model shared behavior, default implementations, and optional capabilities.
01 · 25 minDesigning Robust Inheritance HierarchiesLocked02 · 20 minMethod Overriding Rules & ContractsLocked03 · 15 minDeep Dive: The super KeywordLocked04 · 22 minAbstract Classes vs InterfacesLocked05 · 18 minMultiple Inheritance Through InterfacesLocked06 · 14 minDefault & Static Interface MethodsLocked07 · 12 minMarker Interfaces & Metadata AlternativesLocked08 · 20 minAdvanced Polymorphism PatternsLocked09 · 16 minCasting, instanceof, and Pattern MatchingLocked10 · 15 minComposition vs InheritanceLocked11 · 30 minMini-Project: Shape HierarchyLocked
Abstract classes excel at sharing partial implementations and state; interfaces define capabilities across unrelated types.
Java 8+ interfaces support default and static methods—use them sparingly to avoid building “god interfaces.”
Document extension points clearly: abstract methods signal required overrides, while default methods provide safe fallbacks.