Answer Posted / hasib reza

Determining at runtime, which overridden method to call, is called dynamic method dispatch.
 This is how Java implements run-time polymorphism.
Whenever a method is called on an object reference,
 Declared type of object reference is checked at compile time to make sure the method exists in declared class.
At run time, the super class objects reference could refer to an instance of any subclass of the declared reference type.
When an overridden method is called through a super class reference,
 Java determines which version of that method to execute based upon the type of object being referred.
When different types of objects are referred to,
 Different versions of an overridden method will be called.
It is the type of the object being referred to
 Not the type of the reference variable

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