Question

In Java, which of the following keywords is used to implement inheritance? SELECT ALL THAT APPLY.

inherits
extends
implements
isA

Answer 1

In Java, the 'extends' and 'implements' keywords are used for inheritance, where 'extends' is for class inheritance and 'implements' for interface implementation. 'inherits' and 'isA' are not valid Java keywords.

Step-by-step explanation:

In Java, the key phrases that are used to implement inheritance are 'extends' and 'implements'. The 'extends' keyword is used when a class inherits from another class, implying a parent-child relationship where the child class receives the attributes and methods of the parent class. The 'implements' keyword comes into play when a class needs to adhere to a particular interface, which can be thought of as a contract that the class agrees to follow, ensuring it provides implementations for all the methods declared by the interface.

Here's an example of both in use:

• To inherit from a superclass: class SubClass extends SuperClass { }
• To implement an interface: class ImplementingClass implements SomeInterface { }

The options 'inherits' and 'isA' are not valid keywords in Java for inheritance.