What is the Need of Inheritance.

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inheritance

Hello,

Recently i was appear for an interview and interviewer ask me one question that Why to use Inheritance we can achieve the same thing by creating the object of one class into another class, and by doing so we can access all the methods of one class into another.

if any one know the exact answer that what unique thing we can achieve by Inheritance and which is not possible by declaring object one one class into another then plz share