Core · Module 6 · Lesson 1 of 6
Inheritance: Reusing and Extending Types
Reuse base class state and behavior in derived types, recognize the five inheritance shapes, and predict construction order and member lookup in small hierarchies.
By the end you can
- Describe how a derived type reuses base members
- Distinguish single, multiple, multilevel, hierarchical, and hybrid inheritance
- Predict construction order and member lookup in a small hierarchy
Builds on Project: A Safe Contact Class With No Leaks.
01 · A question first
Your catalog holds books, DVDs, and magazines. Each has an ID and title, plus its own loan rule and print format. How do you write ID and title once, extend them five different ways, and still know which constructor runs first when you create a Book?
Make a guess before you read on.
02 · The idea
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What's inside
- Start with shared behavior
- How reuse works
- The five shapes you will meet
- Why lookup stays correct
- Analogy and a second build order check
- Cost, limits, and better options
- Where this is used
03 · Practice
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