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Inheritance vs Polymorphism

🔍 Row‑by‑row similarity comparison · main focus on shared traits

🧬 Inheritance extends	🎭 Polymorphism @Override
✅ MAIN FOCUS: Both concepts are deeply connected — polymorphism usually depends on inheritance or interfaces to work.
1 · Parent class Uses a superclass (BankAccount) as a blueprint for child classes.	1 · Parent class Uses the same superclass (BankAccount) to define a common interface.
2 · Keyword Child class declares relationship with extends.	2 · Keyword Also relies on extends to inherit the parent’s method signature.
3 · Code reuse Inherits fields like balance and methods like deposit().	3 · Code reuse Reuses the inherited method signature and structure from the parent.
4 · Object creation new SavingsAccount() creates a child object.	4 · Object creation new SavingsAccount() is assigned to a parent reference.
5 · Method call Calls inherited method directly: sa.deposit(500).	5 · Method call Calls overridden method via parent reference: acc.accountType().
6 · OOP pillar One of the four fundamental pillars of OOP.	6 · OOP pillar Also one of the four fundamental pillars of OOP.
7 · Class diagram Shown as a hollow triangle arrow ▷ pointing to parent.	7 · Class diagram Appears on the same diagram — represented via override notes or dynamic dispatch.
8 · Real-world use Reuse common logic across multiple account types.	8 · Real-world use Swap behavior behind a common interface without changing calling code.

🔑 Key insight: Inheritance and polymorphism are not opposites — they are partners. Inheritance provides the shared blueprint; polymorphism lets each subclass express its own version of that blueprint through the same method call.