The Four Pillars
Objects and Classes
Relationships
Beyond the Basics
Real-World OOP
Tease Your Mind
100
This principle involves bundling data and methods that operate on the data within a single unit, keeping the internal representation hidden from the outside world.
What is Encapsulation?
100
This is the blueprint or template from which objects are created.
What is a Class?
100
This relationship describes when one class "has a" reference to another class, forming a part-whole relationship.
What is Composition?
100
This term describes a block of code within a class that performs a specific task and may return a value.
What is a Method or Function?
100
This example of OOP could involve defining different types of vehicles (cars, motorcycles, etc.) as subclasses of a general "Vehicle" class.
What is modeling a Transportation System?
100
A woman is born in 2020, but dies in 1995. How can this be?
What is, she was born in 2020 BC?
200
This allows new classes to obtain properties and behaviors from existing classes, promoting code reusability.
What is Inheritance?
200
This is an instance of a class, representing a real-world entity with state and behavior.
What is an Object?
200
This type of inheritance is imposed by Java to avoid complex ambiguity.
What is Single Inheritance?
200
In Java, this keyword refers to the current object within a method or constructor.
What is "this"?
200
In a library management system, this OOP principle allows you to treat different types of books (fiction, non-fiction) as the same general type of "Book" object.
What is Polymorphism?
200
Among timepieces, sundials have the fewest moving parts. Which timepiece has the most moving parts?
What is an hourglass?
300
This principle allows objects of different classes to be treated as objects of a common type, often implemented through method overloading and overriding.
What is Polymorphism?
300
This term describes the data that an object holds, representing its current condition.
What is State?
300
In Java, this keyword is used to indicate that a class is establishing a contract with an interface.
What is "implements"?
300
This type of error occurs when code breaks while running, like attempting to divide by zero.
What is a Runtime error?
300
If you have a class representing a "Dog" and it acquires common attributes and behaviors from a "Mammal" class, you're using this OOP principle.
What is Inheritance?
300
A family has two parents and six sons. Each of the sons has one sister. How many people are in the family?
What is nine? Two parents, six sons, and one daughter!
400
This involves hiding the complex implementation details and only exposing the necessary features to the user, often through interfaces or abstract classes.
What is Abstraction?
400
This term describes the actions an object can perform, typically implemented through methods.
What is Behavior?
400
This is a UML term indicating a general connection between two objects, without specifying a specific type of connection.
What is an Association?
400
This refers to the practice of giving multiple methods the same name, but with different parameter lists, within the same class.
What is Method Overloading?
400
In a banking system, hiding the complex details of how a transaction is processed and only providing a simple "deposit" or "withdraw" method utilizes this OOP principle.
What is Abstraction?
400
Which figure should be placed in the empty triangle?
What is 3?
500
These four principles are often referred to as the foundation of Object-Oriented Programming.
What are Inheritance, Polymorphism, Encapsulation, and Abstraction?
500
This refers to the uniqueness that distinguishes one object from another, even if they have the same state and behavior.
What is Identity?
500
This is the process of defining specialized behaviors for a method inherited from a parent class.
What is Overriding?
500
The water level in a reservoir is low, but doubles every day. It takes 60 days to fill the reservoir. How long does it take the reservoir to become half full?
What is 59 days?
500
If you have a "Restaurant" class that contains a "Table" object, you are demonstrating this type of relationship.
What is Composition (or "has a" relationship)?
500
In what number parking spot is the car parked?
What is 87?