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Here are some commonly asked OOPs (Object-Oriented Programming System) interview questions categorized by difficulty level: --- Basic OOPs Interview Questions 1. What are the basic principles of OOP? Encapsulation, Abstraction, Inheritance, Polymorphism. 2. What is the difference between a class and an object? 3. What is encapsulation and how is it implemented in Java? 4. What is the difference between abstraction and encapsulation? 5. What is inheritance? Explain with an example. 6. What is polymorphism? Explain its types. 7. What is method overloading and method overriding? 8. What is a constructor? What are its types? 9. What is the difference between ‘is-a’ and ‘has-a’ relationships? 10. What is the purpose of the super keyword in Java? --- Intermediate OOPs Questions 1. What is the difference between compile-time and run-time polymorphism? 2. How does Java achieve abstraction? 3. What are abstract classes and interfaces? How are they different? 4. What is multiple inheritance? Why...