What is need of runtime polymorphism in java?

Answer 1

Runtime polymorphism or Dynamic Method Dispatch is a process in which a call to an overridden method is resolved at runtime rather than compile-time. In this process, an overridden method is called through the reference variable of a superclass.

From:
https://www.javatpoint.com/runtime-polymorphism-in-java#:~:text=Runtime%20polymorphism%20or%20Dynamic%20Method,reference%20variable%20of%20a%20superclass.

Answer 2

Because objects are not created until runtime. Therefore, dynamic polymorphism (method overriding) is best resolved at runtime.