Polymorphism is one of the features or results of inheritance.
That's not true. What is true is that *in Java* polymorphism is coupled to inheritances. But there are languages that provide polymorphism without the need for inheritance; and there are other languages that have inheritance without polymorphism.
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus