Which keyword is used in Java to implement inheritance?

Correct option is A

In Java, inheritance is a fundamental object-oriented programming (OOP) concept that allows a class to inherit properties and methods from another class. The keyword  extends is used to implement inheritance in Java, enabling a subclass to inherit from a superclass. This promotes code reusability and establishes a hierarchical relationship between classes. Therefore, the correct answer is (a) extends.
Important Key Points:
1. Inheritance in Java:
· Inheritance allows a class (subclass) to inherit fields and methods from another class (superclass).
· It promotes code reusability and establishes an "is-a" relationship between classes.
2. Keyword extends:
· The extends keyword is used to create a subclass that inherits from a superclass.
· Example:
class Animal { }
class Dog extends Animal { }
· Here, Dog inherits from Animal.
2. Other Keywords:
· inherits: Not a valid keyword in Java.
· implements: Used to implement interfaces, not inheritance.
Knowledge Booster:
· Types of Inheritance in Java:
· Single inheritance: A class inherits from one superclass.
· Multilevel inheritance: A class inherits from a subclass, which in turn inherits from another superclass.
· Hierarchical inheritance: Multiple subclasses inherit from a single superclass.
· Java does not support  multiple inheritance (a class inheriting from multiple superclasses) to avoid complexity and ambiguity.
· The super keyword is used in Java to refer to the superclass's methods or constructors.
· Inheritance is a key feature of OOP, along with  encapsulation,  polymorphism and  abstraction.