Exercise: Encapsulation

Questions for: Encapsulation

What is the role of a setter method in encapsulation?
A:
To retrieve the value of a private variable.
B:
To provide a static method for a class.
C:
To set the value of a private variable with validation.
D:
To define a private variable.
Answer: C
A setter method in encapsulation is used to set the value of a private variable with validation, ensuring controlled access.
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Which of the following is true about encapsulation?
A:
It involves exposing all implementation details of an object.
B:
It is achieved through the use of global variables.
C:
It allows for unrestricted access to internal details of an object.
D:
It combines data and methods into a single unit and hides implementation details.
Answer: D
Encapsulation in Python combines data and methods into a single unit and hides implementation details.
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What is the primary benefit of using encapsulation in object-oriented programming?
A:
It allows unrestricted access to the internal details of an object.
B:
It promotes code reusability.
C:
It enhances data security by hiding implementation details.
D:
It simplifies the process of class instantiation.
Answer: C
The primary benefit of using encapsulation is that it enhances data security by hiding the implementation details of an object.
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In Python, what does the double underscore prefix in a variable, like __variable, indicate?
A:
A protected variable
B:
A private variable
C:
A global variable
D:
A constant variable
Answer: B
The double underscore prefix in Python, as in __variable, indicates a private variable.
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Consider the following Python code: 
class Car:
    def __init__(self, model, year):
        self.__model = model
        self.__year = year

    def display_info(self):
        return f"Model: {self.__model}, Year: {self.__year}"
What concept of encapsulation is demonstrated in this code?
A:
Public access specifier
B:
Private access specifier
C:
Protected access specifier
D:
Global variable
Answer: B
The double underscore prefix (__) in the variables __model and __year indicates that they are private variables, demonstrating encapsulation by hiding the implementation details.
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