Questions and Answers
The process of inheritance should establish a(n) ________ relationship.
IS-A
The original class that is used to derive a new class using inheritance is called _________.
All of the above (A superclass, parent class, and a base class)
In order for derived classes to have access to encapsulated data members and methods of superclasses, the data members and methods should be declared using the ___________ modifier.
protected
The special reference ________ is used to refer to the parent class in a child class.
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When a variable is declared in a subclass and has the same name as a variable declared in a superclass, it is called a ________ variable.
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Which of the following keywords indicates a new class is being derived from an existing class?
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All Java classes are subclasses of the __________ class.
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Of the classes below, the one that is most likely to be declared 'abstract' is ____________.
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In Java, subclasses can only 'extend' one parent class.
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An abstract class must contain abstract methods.
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A child class is not allowed to define a method with the same name and parameter list as a method in the parent class.
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A class declared 'final' cannot be used as a basis for inheritance.
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Describe the relationship between a parent class and a child class.
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What does the protected modifier accomplish?
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Why is the super reference important to a child class?
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What is the difference between single inheritance and multiple inheritance?
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Why would a child class override one or more of the methods of its parent class?
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What is the role of an abstract class?
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Can you inherit from multiple classes or implement multiple interfaces?
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Study Notes
Inheritance Concepts
- Inheritance establishes an IS-A relationship between derived and base classes.
- The class from which a new class is derived is known as a superclass, parent class, or base class.
Access Modifiers
- The Protected modifier allows derived classes to access encapsulated data and methods in superclasses.
Special References
- The "super" reference is used in a child class to refer to its parent class.
Variable Shadowing
- A variable declared in a subclass with the same name as a variable in the superclass is called a shadow variable.
Class Derivation
- The keyword "extends" indicates that a new class is derived from an existing class.
Base Class
- All Java classes inherit from the Object class, which serves as the root of the class hierarchy.
Abstract Classes
- The class most likely to be declared abstract in a hierarchy is generally a base class like "Animal".
Inheritance Limitations
- Java allows subclasses to extend only one parent class, indicating single inheritance.
- An abstract class is not required to contain abstract methods.
Method Overriding
- A child class can define a method with the same name and parameters as a parent class method, contrary to improper assumptions.
Final Classes
- Classes declared as "final" cannot serve as a parent class for inheritance, preventing further extension.
Protected Modifier Effect
- The protected modifier enables access to members from any class within the same package.
Constructor Calls
- The super reference is critical in a child class for invoking the parent class's constructor.
Differences in Inheritance Types
- Java supports single inheritance to avoid property clashes, while multiple inheritance is disallowed.
Method Redefinition
- A child class may override parent class methods to customize behavior and provide its own specific implementations.
Role of Abstract Classes
- Abstract classes serve as general concepts that facilitate the creation of child classes through extensions.
Interface Implementation
- Java prohibits multiple class inheritance but allows a class to implement multiple interfaces, differentiating between classes and interfaces.
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Test your knowledge of inheritance in Java programming with these flashcards. Each card presents key terms and definitions that are crucial for understanding how inheritance works in object-oriented programming. Perfect for Java learners and enthusiasts!
