Rate yourself in Java. Explain Polymorphism with example

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I rate myself 7/10 in Java. Polymorphism is the ability of an object to take on many forms.

Polymorphism allows objects of different classes to be treated as if they were objects of the same class.
There are two types of polymorphism: compile-time polymorphism (method overloading) and runtime polymorphism (method overriding).
Example of runtime polymorphism: Animal class has a method called makeSound(). Dog and Cat classes inherit from Animal and override the makeSound() method to produce different sounds.
Example of compile-time polymorphism: Calculator class has multiple methods with the same name but different parameters, allowing for different types of calculations to be performed.

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