What is runtime polymorphism or dynamic method dispatch?

Question

I don't understand how polymorphism is implemented through this.

Answer 1

In the context of JAVA, a dynamic method dispatch or runtime-polymorphism represents a process where when a overridden method is called, the call is resolved at run-time rather than during compilation. In a process such as this, the overridden function is called by a reference of a super-class. The decision as to which method method will be called is dependent on the object that the reference variable is pointing toward. 

To learn java in a much more industry oriented manner, it is highly recommended to use such concepts of inheritance and polymorphism in your projects.