01
Choose one
1 point
Which statement best distinguishes a class from an object?
Free Practice Quiz Question List
1 Object-Oriented Programming Foundations Online Quiz Questions
Use this free practice quiz with 20 questions to review 1 Object-Oriented Programming Foundations, test your knowledge, and prepare for your next test or exam.
20 questions
02
Choose one
1 point
An Order object contains a PaymentMethod object and delegates payment work to it. Which OOP relationship does this illustrate?
- A
Composition
- B
Inheritance
- C
Polymorphism
- D
Encapsulation
03
Choose one
1 point
What is the primary role of an interface in the material's OOP model?
- A
It defines a contract that implementing classes promise to provide.
- B
It stores the complete state of every implementing object.
- C
It forces all implementing classes to inherit from one concrete class.
- D
It automatically prevents all changes to an object's state.
04
Choose all
1 point
Which two outcomes are supported by effective encapsulation? Select all that apply.
- A
It prevents outside code from arbitrarily corrupting object state.
- B
It guarantees that every class must use inheritance.
- C
It allows internal representation to change without requiring caller changes.
- D
It requires every field to be publicly accessible.
05
Choose all
1 point
Which two guidelines are consistent with the material's advice about choosing inheritance and composition? Select all that apply.
- A
Use inheritance whenever one class uses another class's methods.
- B
Use inheritance when the subtype genuinely conforms to the base type's promises.
- C
Use composition when a class contains a replaceable component.
- D
Use inheritance whenever it produces the deepest possible hierarchy.
06
True or false
1 point
True or false: Inheritance is most appropriate when a subtype conforms to the promises of its base type.
- A
True
- B
False
07
True or false
1 point
True or false: Polymorphism requires processing code to contain separate logic for every concrete object type.
- A
True
- B
False
08
Written response
1 point
What OOP principle bundles an object's state and behavior while controlling access to its internal details?
09
Written response
1 point
What OOP term describes using a common type while allowing an object's actual type to determine the implementation of an operation?
10
Fill in the blank
1 point
An object's is the information stored in it at a particular time, while its is the work it can perform.
11
Fill in the blank
1 point
Inheritance represents an relationship, whereas composition represents a relationship.
12
Open ended
1 point
Explain how the payment example demonstrates polymorphism and why that design allows a new payment type to be added with minimal changes to processPayment.
13
Choose one
1 point
A design team wants an Order to support credit-card and gift-card payment objects interchangeably and to replace the payment object without rewriting Order's core logic. Which design choice best fits the material?
- A
Inheritance, because every Order is a PaymentMethod.
- B
Inheritance, because PaymentMethod should be the Order's superclass.
- C
Composition, because an Order contains a PaymentMethod as a replaceable part.
- D
Encapsulation, because the Order should expose all payment implementation details.
14
Choose one
1 point
Which statement best distinguishes a class from an object in object-oriented programming?
- A
A class is a concrete instance, while an object is a blueprint.
- B
A class is a blueprint, while an object is a concrete instance.
- C
A class stores only behavior, while an object stores only state.
- D
A class and an object are two names for exactly the same thing.
15
True or false
1 point
True or false: An interface defines operations that an implementing class promises to provide, without necessarily prescribing all of the implementation details.
- A
True
- B
False
16
Choose one
1 point
A bank account stores a current balance and provides a deposit operation. Which classification is correct?
- A
The account balance is behavior, while depositing money is state.
- B
Both the account balance and depositing money are behavior.
- C
The account balance is state, while depositing money is behavior.
- D
State and behavior are interchangeable terms for methods.
17
Written response
1 point
What design term describes the property of a class having a focused purpose instead of combining unrelated responsibilities?
18
Choose one
1 point
A bank-account class keeps its balance private and requires callers to use validated methods for updates. What object-oriented principle is most directly illustrated?
- A
The class protects its internal state and exposes controlled operations.
- B
The class must expose every field publicly so callers can update it.
- C
The class can never change its internal representation.
- D
The class creates a subclass for every invalid input.
19
Choose one
1 point
Why is inheritance a plausible relationship between SavingsAccount and BankAccount in the material's example?
- A
A SavingsAccount has a BankAccount as a replaceable component.
- B
A SavingsAccount uses a BankAccount only through an unrelated utility.
- C
A SavingsAccount is a kind of BankAccount and can specialize its behavior.
- D
A SavingsAccount and BankAccount must be unrelated because they have different balances.
20
Written response
1 point
What design term describes the degree of dependency between classes that object-oriented design aims to minimize?