Questions and Answers
What is inheritance in Java?
Inheritance in Java is the technique of creating a new class by using an existing class functionality. It is a process where a child class acquires all the properties and behaviors of the parent class.
Why do we need to use inheritance or what is the purpose of using inheritance?
Inheritance is used for code reusability in Java. It helps to increase the features of a class or method by overriding and achieve runtime polymorphism.
What is Is-A relationship in Java?
Is-A relationship represents inheritance in Java and is implemented using the 'extends' keyword.
What is a superclass and subclass?
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How is inheritance implemented or achieved in Java?
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What is the syntax for creating the subclass of a class?
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Which class in Java is superclass of every other class?
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A class can extend itself.
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A class can extend more than one class.
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Static members are inherited to subclass in Java.
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A final class can be extended.
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Can we assign a superclass to a subclass?
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Are constructors inherited to subclass?
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Are static blocks inherited to subclass in Java?
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Study Notes
Inheritance in Java
- Inheritance allows the creation of a new class that utilizes the properties and behaviors of an existing class (parent class).
- A child class inherits features from a parent class, enabling code reusability and reduced redundancy.
Purpose of Inheritance
- Facilitates code reuse and reduces duplication.
- Enables runtime polymorphism through method overriding and enhances features of a class.
Is-A Relationship
- The "Is-A" relationship signifies inheritance, demonstrated by the "extends" keyword.
- This relationship supports code reusability in Java.
Superclass and Subclass
- Superclass: The class that provides features (also known as the base or parent class).
- Subclass: A class that inherits from another class, also termed as derived, child, or extended class.
Implementing Inheritance
- Achieved using the keywords "extends" (for class-to-class relationships) and "implements" (for class-to-interface relationships).
Subclass Syntax
- Use the "extends" keyword to declare a subclass.
- Example syntax:
class subclassName extends superclassName { // Variables of subclass // Methods of subclass }
Object Class
- The Object class is the universal superclass of all classes in Java.
Inheritance Features
- Features from a superclass are inherited by a subclass but cannot be overridden.
- Constructors and instance initialization blocks from the superclass are not inherited, though executed when a subclass object is created.
Constraints in Inheritance
- A class cannot inherit from itself.
- Superclass cannot be assigned to subclass directly.
- A class can only extend one class (single inheritance); multiple inheritance is not permitted in Java.
- Static methods are inherited as static members, while non-static methods are inherited as non-static members.
- Final classes cannot be inherited.
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Description
Explore key concepts of inheritance in Java through a set of flashcard questions. This quiz covers the definition of inheritance and its purpose in Java programming, emphasizing code reusability and class relationship. Test your understanding and get ready to enhance your Java skills!