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Selenium Interview Question 42 – Does Java supports multiple inheritance?

Selenium Interview Question 42 – Does Java supports multiple inheritance?

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Does Java supports multiple inheritance?

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The answer is Yes and No.

Multiple Inheritance is not supported in case of Classes:

In the case of Classes, a single class cannot inherit multiple classes due to the ambiguity problem.

Let’s say there are three classes i.e. ClassA, ClassB, and ClassC. Assume that ClassA and ClassB have a method having the same name say mOne(). In this case, if ClassC extends both ClassA and ClassC, then there is an ambiguity of inheriting mOne() from either ClassA or ClassB. i.e. Java cannot decide whether the mOne() can be inherited from ClassA or ClassB.

Hence multiple inheritance is not supported for Classes in Java.

Multiple Inheritance is supported in case of Interfaces:

In the case of Interfaces, a single class can inherit multiple interfaces as there is no ambiguity problem.

Let’s say there are two interfaces, i.e. InterfaceA, InterfaceB, and a class ClassC. Though InterfaceA and InterfaceB have a method with the same name say mOne(), ClassC can still inherit multiple interfaces, as mOne() method is not implemented in any of the interfaces.

Hence multiple inheritance is supported by Interfaces in Java.

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