18 Questions
What is the primary benefit of inheritance in OOP?
Reusability
What is the term for a class above a specific class in the class hierarchy?
Superclass
How do you derive a class from a superclass in Java?
Using the 'extends' keyword
What is the purpose of a constructor in a subclass?
To implement the differences between the subclass and the superclass
What happens when a subclass is instantiated?
Both the subclass's and superclass's constructors are called
What is the purpose of the 'super' keyword in Java?
To access the superclass's methods
What is the purpose of abstract classes in object-oriented programming?
To define broad types of actions possible with objects of all subclasses
What happens when a class extends an abstract class and does not override the abstract method?
The subclass cannot be instantiated and becomes an abstract class
What is the purpose of the abstract keyword in an abstract method?
To declare the method without implementation
What is the result of using abstract classes in object-oriented programming class hierarchy?
A broad definition of behaviors at the top of the hierarchy
What is the role of the subclass in an abstract class hierarchy?
To provide implementation details of the abstract class
What guideline is recommended for using abstract classes in object-oriented programming?
Use abstract classes to define broad types of behaviors at the top of the hierarchy
What is the primary requirement for using the super() call in a constructor?
It must be used as the first statement in a constructor.
What is the purpose of the super keyword in a subclass constructor?
To initialize the superclass with the parameters provided.
What is the consequence of using both the super() and this() calls in the same constructor?
The compiler will throw an error.
What is the purpose of overriding methods in a subclass?
To provide a new implementation of a method that is different from the superclass.
What is the role of the super keyword in referencing members of the superclass?
It is used to refer to members of the superclass.
What happens when a subclass constructor does not explicitly call the superclass constructor?
The subclass constructor will call the default constructor of the superclass.
Understand the concepts of inheritance, polymorphism, and interfaces in Java programming. Learn to define super classes and subclasses, override methods, and create final methods and classes.
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