Quiz2-OOP-MakScie

Which element in a class diagram shows the attributes of a class?

• Methods

• Attributes section

• Operations section

• Associations

In UML class diagrams, what does the symbol '+' before an attribute mean?

• Protected

• Private

• Public

• Static

Given the class diagram: Car

----------------

+ brand: str

+ speed: int

----------------

+ accelerate()

+ brake()

Which Python class matches it?

class Car:

def init(self, brand, speed):

self.brand = brand

self.speed = speed

def accelerate(self):

print("Accelerating...")

def brake(self):

print("Braking...")

• Matches

• Missing methods

• Missing attributes

• Wrong constructor

In UML, inheritance is represented by:

• Dotted line

• Solid line with arrowhead

• Solid line with hollow triangle

• Dashed line with arrow

If Circle inherits from Shape, which is correct in Python?

• Correct implementation

• Needs __init__ in Shape

• Invalid inheritance

• Circle cannot extend Shape

Aggregation in class diagrams is represented by:

• Empty diamond

• Filled diamond

• Hollow arrow

• Dashed arrow

Composition in class diagrams means:

• Objects exist independently

• Objects cannot exist without parent

• Classes are unrelated

• Inheritance relationship

What does this diagram mean?

Teacher 1 --- * Student

• A teacher has one student

• A teacher can have many students

• A student can have many teachers

• No relationship

Which keyword represents inheritance in Python?

• extend

• super

• class Child(Parent)

• derive

What does <> in UML mean?

• Abstract class

• Inheritance

• Encapsulation

• Method overloading