🧾 Java OOPs Scenario-Based Programming Questions (50 Questions)

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🔹 Section A: Classes & Objects

Q1. (Scenario Based)

A college wants to manage student information.
Write a Java program to:

• Create a class Student
• Include data members: id, name, marks
• Add a method to display student details
• Create at least 3 student objects and display their data

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Q2. (Scenario Based)

A company needs to store employee details.
Write a Java program to:

• Create a class Employee
• Store empId, name, salary
• Display employee details using a method

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Q3. (Scenario Based)

A construction company wants to calculate area of plots.
Write a Java program to:

• Create a class Rectangle
• Add methods to calculate area and perimeter
• Display results

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Q4. (Scenario Based)

A sports academy tracks player performance.
Write a Java program to:

• Create a class Player
• Store player name and score
• Display player details

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Q5. (Scenario Based)

A library wants to manage books.
Write a Java program to:

• Create a class Book
• Include title, author, price
• Display book information

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🔹 Section B: Constructors

Q6. (Scenario Based)

A car showroom needs to initialize car details at the time of creation.
Write a Java program to:

• Create a class Car
• Use constructor to initialize brand and price
• Display details

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Q7. (Scenario Based)

A packaging company needs boxes of different sizes.
Write a Java program to:

• Create a class Box
• Use constructor overloading for different dimensions

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Q8. (Scenario Based)

A school system assigns default values to students initially.
Write a Java program to:

• Create a class with default constructor
• Assign and display values

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Q9. (Scenario Based)

A bank initializes account details during account creation.
Write a Java program to:

• Create class Account
• Use parameterized constructor to initialize account details

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Q10. (Scenario Based)

A system needs to reuse constructor logic.
Write a Java program to:

• Demonstrate constructor chaining using this()

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🔹 Section C: Inheritance

Q11. (Scenario Based)

An animal simulation system needs common and specific behaviors.
Write a Java program to:

• Create base class Animal
• Derive class Dog
• Display sound

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Q12. (Scenario Based)

A company wants to manage employee hierarchy.
Write a Java program to:

• Create classes Person and Employee
• Inherit properties and display details

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Q13. (Scenario Based)

A company has multiple levels of management.
Write a Java program to:

• Implement multilevel inheritance (Person → Employee → Manager)

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Q14. (Scenario Based)

A drawing application supports multiple shapes.
Write a Java program to:

• Create base class Shape
• Derive Circle and Rectangle
• Calculate area

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Q15. (Scenario Based)

A system needs to reuse parent class initialization.
Write a Java program to:

• Use super keyword to call parent constructor

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🔹 Section D: Method Overloading

Q16. (Scenario Based)

A system needs to perform different operations using the same method name.
Write a Java program to:

• Create class Calculator
• Overload method calculate() for:
  • Adding two numbers
  • Adding three numbers
• Display results

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Q17. (Scenario Based)

A geometry tool calculates area for different shapes.
Write a Java program to:

• Overload method area() for circle and rectangle

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Q18. (Scenario Based)

A student system stores different types of data.
Write a Java program to:

• Overload method display() for different parameters

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Q19. (Scenario Based)

A calculator handles different data types.
Write a Java program to:

• Overload method for int, double

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Q20. (Scenario Based)

A printing system needs multiple formats.
Write a Java program to:

• Overload method print()

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🔹 Section E: Method Overriding

Q21. (Scenario Based)

An animal system needs specific sound behavior.
Write a Java program to:

• Override method sound() in subclass

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Q22. (Scenario Based)

A vehicle system needs different running behavior.
Write a Java program to:

• Override method run() in subclass

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Q23. (Scenario Based)

A system needs runtime decision for method execution.
Write a Java program to:

• Demonstrate runtime polymorphism

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Q24. (Scenario Based)

A company customizes behavior of inherited methods.
Write a Java program to:

• Use @Override annotation

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Q25. (Scenario Based)

A system wants to extend parent functionality.
Write a Java program to:

• Override method and call parent method using super

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🔹 Section F: Polymorphism

Q26. (Scenario Based)

A payroll system calculates salary differently for employees.
Write a Java program to:

• Create class Employee
• Subclasses: FullTime, PartTime
• Use dynamic method dispatch

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Q27. (Scenario Based)

A system processes different types of payments.
Write a Java program to:

• Use parent reference for multiple payment types

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Q28. (Scenario Based)

A system handles different object types using one reference.
Write a Java program demonstrating upcasting

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Q29. (Scenario Based)

A system needs access to child-specific methods.
Write a Java program demonstrating downcasting

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Q30. (Scenario Based)

A system needs flexible method execution.
Write a Java program using runtime polymorphism

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🔹 Section G: Encapsulation

Q31. (Scenario Based)

A bank needs to protect customer data.
Write a Java program to:

• Create class BankAccount
• Use private variables
• Provide deposit and withdraw methods

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Q32. (Scenario Based)

A system restricts direct access to data.
Write a Java program using getters and setters

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Q33. (Scenario Based)

A system validates user input.
Write a Java program to:

• Add validation in setter method

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Q34. (Scenario Based)

A company hides internal data from users.
Write a Java program demonstrating data hiding

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Q35. (Scenario Based)

A system ensures controlled access to variables.
Write a Java program using encapsulation

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🔹 Section H: Abstraction

Q36. (Scenario Based)

A drawing system defines common structure for shapes.
Write a Java program to:

• Create abstract class Shape
• Define abstract method area()

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Q37. (Scenario Based)

A vehicle system defines common operations.
Write a Java program using abstract class

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Q38. (Scenario Based)

A system uses both abstract and concrete methods.
Write a Java program demonstrating abstract class

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Q39. (Scenario Based)

A payroll system needs flexible salary calculation.
Write a Java program using abstract class Employee

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Q40. (Scenario Based)

A system models real-world abstraction.
Write a Java program using abstract class

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🔹 Section I: Interfaces

Q41. (Scenario Based)

A system defines common behavior for vehicles.
Write a Java program to:

• Create interface Vehicle
• Implement in Car and Bike

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Q42. (Scenario Based)

A system requires multiple capabilities.
Write a Java program to:

• Implement multiple interfaces

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Q43. (Scenario Based)

A system extends interface functionality.
Write a Java program demonstrating interface inheritance

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Q44. (Scenario Based)

A system uses default functionality in interfaces.
Write a Java program using default methods

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Q45. (Scenario Based)

A system simulates multiple inheritance.
Write a Java program using interfaces

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🔹 Section J: Integrated Real-World Problems

Q46. (Scenario Based)

A library wants to manage books and users.
Design a Java program using OOP principles

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Q47. (Scenario Based)

A school needs a result management system.
Design using classes and inheritance

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Q48. (Scenario Based)

A bank needs a complete account management system.
Design using encapsulation and inheritance

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Q49. (Scenario Based)

An e-commerce system processes different payment methods.
Design using polymorphism

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Q50. (Scenario Based)

A vehicle rental company needs a system to manage vehicles and bookings.
Design using OOP concepts