Questions and Answers
A subclass may not override any method other than the init method.
False
A superclass inherits attributes and methods from its subclasses without any of them having to be rewritten.
False
An 'is a' relationship exists between a grasshopper and a bumblebee.
False
What are base classes also called?
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Each subclass has a method named init that overrides the superclass's init method.
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How many accessor and mutator methods are needed to complete the class definition in the example?
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In a UML diagram, what would the open arrowhead point to in the given class definition?
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In a UML diagram depicting inheritance, you only need to write the name of the subclass.
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In a UML diagram, what does the open arrowhead point to?
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What is a specialized class called in an inheritance relationship?
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What is the name of the base class in the provided class definition?
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What is the name of the subclass in the provided code?
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New attributes and methods may be added to a subclass.
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Of the two classes, Cherry and Flavor, which would most likely be the subclass?
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One problem with using a UML diagram is that there is no way to indicate inheritance.
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Polymorphism works on any two class methods that have the same name.
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What does a subclass inherit from a superclass?
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What gives a program the ability to call the correct method depending on the type of object used?
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What is the relationship called in which one object is a specialized version of another object?
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When a class inherits another class, it is required to use all the data attributes and methods of the superclass.
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When there are several classes that have many common data attributes, it is better to write a(n) ________ to hold all the general data.
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Which method can you use to determine whether an object is an instance of a class?
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What is the correct syntax for defining a class 'table' which inherits from 'furniture'?
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________ allows a new class to inherit members of the class it extends.
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________ 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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Description
Test your knowledge on Python Chapter 11 with these flashcards. Each card presents a statement about subclasses, superclasses, and relationships in object-oriented programming. Determine whether each statement is true or false to reinforce your understanding.
