What is the role of a destructor in OOP languages that support it?

Perform cleanup task & release resource before object is remove from memory

In OOP, composition is best described as:

When one class includes an object of another class as a member variable

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Mastering Object-Oriented Programming

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Test your knowledge and deepen your understanding of Object-Oriented Programming concepts

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Questions 19

Answers

1
Which concept hides complexity?
Encapsulation
Abstraction
Polymorphism
Inheritance
2
What is the role of a destructor in OOP languages that support it?
To create a copy of an existing object
To initialize an object with default values
To allocate memory for objects
Perform cleanup task & release resource before object is remove from memory
3
In OOP, composition is best described as:
When one class includes an object of another class as a member variable
Reusing methods in multiple classes through inheritance
Defining abstract classes to be implemented
A way to define "is-a" relationships between classes
4
Which keyword defines an interface?
interface
extends
abstract
class
5
True or False: Classes are blueprints for objects.
True
False
6
What is an object in OOP?
Function
Instance of class
Method
Variable
7
True or False: OOP uses global variables extensively.
False
True
8
True or False: OOP is outdated technology.
False
True
9
True or False: OOP is only for large projects.
False
True
10
Which is a benefit of OOP?
Easier maintenance
Slower development
More bugs
Less collaboration
11
What does a constructor do?
Destroy objects
Create methods
Modify classes
Initialize objects
12
Which keyword is used for inheritance?
inherits
implements
includes
extends
13
What is encapsulation in OOP?
Static methods
Code duplication
Hiding data
Multiple inheritance
14
What is method overloading?
Different names, same params
Same name, same params
No parameters
Same name, different params
15
What does polymorphism allow?
Multiple forms
No forms
Single form
Static types
16
True or False: Inheritance creates a parent-child relationship.
False
True
17
Which is NOT an OOP principle?
Inheritance
Encapsulation
Abstraction
Iteration
18
True or False: OOP promotes code reusability.
False
True
19
What is a subclass?
Parent class
Child class
Abstract class
Interface

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