Computer Knowledge

Object-Oriented Programming

2,239 Questions

Object-oriented programming questions test core computer science concepts like classes, inheritance, polymorphism, and encapsulation. The focus includes Java program structures, method overloading, and memory allocation for objects. This topic is essential for technical sections in various recruitment tests.

Java class definitionsMethod overriding rulesPolymorphism conceptsGeneric type parametersMemory allocation in objects

Object-Oriented Programming Questions

Multiple choice

Which design pattern is commonly used to provide flexibility and extensibility by allowing new behaviors to be added without modifying existing code?

  1. Singleton

  2. Factory

  3. Strategy

  4. Builder
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Strategy pattern allows different algorithms or behaviors to be selected at runtime, providing flexibility and extensibility without modifying the core logic.

Multiple choice

Which programming paradigm is known for its encapsulation, inheritance, and polymorphism features?

  1. Imperative Programming

  2. Declarative Programming

  3. Object-Oriented Programming

  4. Functional Programming
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Object-oriented programming organizes code into objects, which contain both data and methods, and allows for inheritance and polymorphism.

Multiple choice

How can mathematical software be used to promote fairness and equity?

  1. By using unbiased data to train the software

  2. By incorporating ethical considerations into the design of the software

  3. By providing users with tools to identify and mitigate bias

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To promote fairness and equity, mathematical software should be trained on unbiased data, incorporate ethical considerations into its design, and provide users with tools to identify and mitigate bias.

Multiple choice

Which of the following is a common software design pattern?

  1. Singleton

  2. Factory

  3. Observer

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Singleton, Factory, and Observer are all common software design patterns. Design patterns are reusable solutions to commonly occurring problems in software design.

Multiple choice

Which of the following is NOT a common design pattern?

  1. Factory Method

  2. Singleton

  3. Observer

  4. Composite
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Composite is not a design pattern; it is a structural pattern that describes how objects can be composed into larger structures.

Multiple choice

What is the main principle behind object-oriented programming?

  1. Encapsulation

  2. Inheritance

  3. Polymorphism

  4. Abstraction
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Abstraction is the fundamental principle of object-oriented programming, which involves hiding the implementation details of an object and exposing only its essential characteristics.

Multiple choice

Which of the following is NOT a common software design anti-pattern?

  1. Spaghetti Code

  2. God Object

  3. Big Ball of Mud

  4. Singleton
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Singleton is not an anti-pattern; it is a design pattern that restricts the instantiation of a class to only one object.

Multiple choice

Which of the following is NOT a common code smell?

  1. Long methods.

  2. Duplicated code.

  3. Unused code.

  4. Well-commented code.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Well-commented code is generally not considered a code smell. In fact, it is often seen as a good practice to add comments to code to make it more readable and understandable.

Multiple choice

How does planning and decision making in autonomous vehicles handle adverse weather conditions?

  1. By adjusting the vehicle's speed and acceleration.

  2. By using sensors and algorithms to detect and respond to weather-related hazards.

  3. By incorporating weather forecasts and road condition data into decision-making.

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Planning and decision making in autonomous vehicles handle adverse weather conditions by adjusting the vehicle's speed and acceleration, using sensors and algorithms to detect and respond to weather-related hazards, and incorporating weather forecasts and road condition data into decision-making.

Multiple choice

What are the different types of casting calls?

  1. Open calls

  2. Closed calls

  3. Targeted calls

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are three main types of casting calls: open calls, closed calls, and targeted calls. Open calls are open to anyone who wants to audition, while closed calls are only open to actors who have been invited. Targeted calls are open to actors who have specific skills or experience that are relevant to the project.

Multiple choice

Which of the following is NOT a fundamental principle of OOP?

  1. Encapsulation

  2. Inheritance

  3. Polymorphism

  4. Modularity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Modularity is not a fundamental principle of OOP. The fundamental principles of OOP are encapsulation, inheritance, and polymorphism.

Multiple choice

What is the process of binding a method call to a specific object called?

  1. Encapsulation

  2. Inheritance

  3. Polymorphism

  4. Dynamic binding
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dynamic binding is the process of binding a method call to a specific object at runtime.

Multiple choice

Which of the following is NOT a type of inheritance in OOP?

  1. Single inheritance

  2. Multiple inheritance

  3. Hierarchical inheritance

  4. Interface inheritance
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Interface inheritance is not a type of inheritance in OOP. The types of inheritance in OOP are single inheritance, multiple inheritance, and hierarchical inheritance.

Multiple choice

What is the ability of a class to inherit the properties and methods of another class called?

  1. Encapsulation

  2. Inheritance

  3. Polymorphism

  4. Abstraction
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Inheritance is the ability of a class to inherit the properties and methods of another class.

Multiple choice

Which of the following is NOT a benefit of using OOP?

  1. Reusability

  2. Maintainability

  3. Extensibility

  4. Complexity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Complexity is not a benefit of using OOP. The benefits of using OOP include reusability, maintainability, and extensibility.