← Exit to Module 7: Advanced Object-Oriented Concepts lessons
Module progress · 0%Lesson · 15 min
Module 7: Advanced Object-Oriented Concepts
Lesson focusComposition vs Inheritance
Decide when delegation beats inheritance and how to migrate brittle hierarchies toward composition.
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
Composition wraps functionality from other classes, allowing runtime substitution and better testability.
Refactor deep hierarchies by extracting reusable collaborators (e.g., MovementController, Renderer).
Document design decisions so future maintainers know why composition or inheritance was chosen.