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Questions and Answers
A subclass may not override any method other than the init method.
A subclass may not override any method other than the init method.
False (B)
A superclass inherits attributes and methods from its subclasses without any of them having to be rewritten.
A superclass inherits attributes and methods from its subclasses without any of them having to be rewritten.
False (B)
An 'is a' relationship exists between a grasshopper and a bumblebee.
An 'is a' relationship exists between a grasshopper and a bumblebee.
False (B)
What are base classes also called?
What are base classes also called?
Each subclass has a method named init that overrides the superclass's init method.
Each subclass has a method named init that overrides the superclass's init method.
How many accessor and mutator methods are needed to complete the class definition in the example?
How many accessor and mutator methods are needed to complete the class definition in the example?
In a UML diagram, what would the open arrowhead point to in the given class definition?
In a UML diagram, what would the open arrowhead point to in the given class definition?
In a UML diagram depicting inheritance, you only need to write the name of the subclass.
In a UML diagram depicting inheritance, you only need to write the name of the subclass.
In a UML diagram, what does the open arrowhead point to?
In a UML diagram, what does the open arrowhead point to?
What is a specialized class called in an inheritance relationship?
What is a specialized class called in an inheritance relationship?
What is the name of the base class in the provided class definition?
What is the name of the base class in the provided class definition?
What is the name of the subclass in the provided code?
What is the name of the subclass in the provided code?
New attributes and methods may be added to a subclass.
New attributes and methods may be added to a subclass.
Of the two classes, Cherry and Flavor, which would most likely be the subclass?
Of the two classes, Cherry and Flavor, which would most likely be the subclass?
One problem with using a UML diagram is that there is no way to indicate inheritance.
One problem with using a UML diagram is that there is no way to indicate inheritance.
Polymorphism works on any two class methods that have the same name.
Polymorphism works on any two class methods that have the same name.
What does a subclass inherit from a superclass?
What does a subclass inherit from a superclass?
What gives a program the ability to call the correct method depending on the type of object used?
What gives a program the ability to call the correct method depending on the type of object used?
What is the relationship called in which one object is a specialized version of another object?
What is the relationship called in which one object is a specialized version of another object?
When a class inherits another class, it is required to use all the data attributes and methods of the superclass.
When a class inherits another class, it is required to use all the data attributes and methods of the superclass.
When there are several classes that have many common data attributes, it is better to write a(n) ________ to hold all the general data.
When there are several classes that have many common data attributes, it is better to write a(n) ________ to hold all the general data.
Which method can you use to determine whether an object is an instance of a class?
Which method can you use to determine whether an object is an instance of a class?
What is the correct syntax for defining a class 'table' which inherits from 'furniture'?
What is the correct syntax for defining a class 'table' which inherits from 'furniture'?
________ allows a new class to inherit members of the class it extends.
________ allows a new class to inherit members of the class it extends.
________ has the ability to define a method in a subclass and then define a method with the same name in a superclass.
________ has the ability to define a method in a subclass and then define a method with the same name in a superclass.
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Study Notes
Inheritance in Object-Oriented Programming
- Subclasses may override only the
__init__method; false statement about overriding other methods. - Superclass does not inherit from subclasses; false statement about attribute and method inheritance.
- An "is a" relationship does not exist between a grasshopper and a bumblebee; false statement.
- Base classes are also referred to as superclasses.
Class Initialization and Methods
- Each subclass contains an
__init__method that overrides the superclass's method; true statement. - For a superclass named
clock, three mutator and three accessor methods are required based on its attributes.
UML Diagram Basics
- In UML, an open arrowhead in code like
class Celery(Vegetable):points to the superclass, which isVegetable. - Only the subclass name is insufficient in UML diagrams; false statement about this requirement.
- Open arrowhead in a UML diagram represents the superclass.
Class Relationships and Specialization
- A specialized class in inheritance is called a subclass.
- In
class Python(Course):, the base class (superclass) isCourse. - In
class Rose(Flower):, the subclass is namedRose. - New attributes and methods can indeed be added to a subclass.
General Classifications
- Between Cherry and Flavor, Cherry is likely the subclass due to its specificity.
- Indicating inheritance is a primary function of UML diagrams; false assertion against this purpose.
Concepts of Polymorphism and Inheritance
- Polymorphism applies to class methods sharing the same name across different classes; true statement.
- Subclasses inherit attributes and methods from superclasses.
- The ability to call the correct method based on the object's type is known as polymorphism.
- The relationship where one object is a specialized version of another is termed "is a".
- Classes are not required to use all data attributes and methods from superclasses; false statement on this necessity.
Designing with Superclasses
- For classes with common data attributes, it is better to create a superclass to hold the shared data.
- The
isinstancemethod determines if an object is an instance of a specific class. - The correct syntax for a class inheriting from another is
class ChildClass(ParentClass):. - Inheritance allows a new class to inherit members from the class it extends.
- Polymorphism enables defining methods with the same name in both a subclass and superclass.
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