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Can you explain the concept of polymorphism and inheritance in Java with examples?

Python/Codinghard0.2 min readPremium

**Inheritance:** Class extends another; inherits fields/methods. `class Dog extends Animal`. **Polymorphism:** Supertype reference → subtype; runtime dispatch. `Animal a = new Dog(); a.eat()` calls Dog's override. **Why:** Extensibility; Liskov Substitution. **Trade-off:**...

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Frequency
Low
Asked at 1 company
Category
179
questions in Python/Coding
Difficulty Split
127E|24M|28H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Meesho
Interview Pro Tip

Pro-Move: Liskov + composition over inheritance. Red Flag: Deep inheritance hierarchies.

Why This Question Matters

This hard-level Python/Coding question appears frequently in data engineering interviews at companies like Meesho. While less common, it tests deeper understanding that distinguishes strong candidates.

How to Approach This

This is a senior-level question that tests architectural thinking. Lead with the high-level design, then drill into specifics. Discuss trade-offs explicitly - there is rarely one correct answer. Show awareness of scale, fault tolerance, and operational complexity.

Expert Answer
44 words

Inheritance: Class extends another; inherits fields/methods. class Dog extends Animal. Polymorphism: Supertype reference → subtype; runtime dispatch. Animal a = new Dog(); a.eat() calls Dog's override. Why: Extensibility; Liskov Substitution. Trade-off: Composition often > inheritance. Production: Interfaces for contracts. Scalability: Polymorphism enables plugin architectures.

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