Questions and Answers
What is the primary purpose of using abstraction in Java?
To hide implementation details and show only the necessary information
Which of the following is a characteristic of an abstract class in Java?
It can have both abstract and concrete methods
What is the purpose of an interface in Java?
To define a blueprint for a class
What is the difference between an abstract class and an interface in Java?
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What is the advantage of using polymorphism in Java?
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Study Notes
Abstraction in Java
- The primary purpose of using abstraction in Java is to hide the implementation details and show only the necessary information to the user.
Abstract Class Characteristics
- An abstract class in Java can have both abstract and non-abstract methods.
- An abstract class can have state (i.e., it can have non-static fields that are not constants).
- An abstract class can have a constructor, but it cannot be instantiated.
Interface in Java
- The purpose of an interface in Java is to define a blueprint for classes that want to implement it.
- An interface is abstract, meaning it cannot be instantiated.
Abstract Class vs Interface
- The main difference between an abstract class and an interface in Java is that an abstract class can have state and a constructor, while an interface cannot.
- An abstract class can have both abstract and non-abstract methods, whereas an interface can only have abstract methods.
Polymorphism Advantages
- The advantage of using polymorphism in Java is that it allows objects of different classes to be treated as objects of a common super class.
- Polymorphism enables method overriding, which allows subclasses to provide specific implementations for methods already defined in their super class.
- Polymorphism increases flexibility and modularity in programming.
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