← Exit to Module 7: Advanced Object-Oriented Concepts lessons
Module progress · 0%Lesson · 18 min
Module 7: Advanced Object-Oriented Concepts
Lesson focusMultiple Inheritance Through Interfaces
Resolve conflicting defaults, compose behaviors, and document intent when a class implements several interfaces.
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
When two interfaces define the same default method, the implementing class must override it explicitly and choose which behavior to use.
Interfaces describing orthogonal capabilities (e.g., Auditable, Versioned) create flexible components without rigid hierarchies.
Use marker interfaces (like Serializable) sparingly; prefer annotations when possible.