Polymorphism

Question 1

What is Polymorphism

Answer 1

The concept that objects of different types can be accessed through the same interface.
Each type can provide its own, independent implementation of this interface.

Question 2

Static or Compile Time Polymorphism

Answer 2

Method Overloading

Question 3

Runtime Polymorphism

Answer 3

Method Overriding

Question 4

Method Overloading Parameter Differences

Answer 4

Need to differ in at least one of these ways

1. Different NUMBER of parameters
2. Different TYPE of parameters
3. (NOT RECOMMENDED; lacks readability) Different ORDER of parameter type.

Question 5

Method Signature

Answer 5

Different set of parameters for overloaded methods. Allows compiler to identify which method has to be called and to bind it to the method call.

Question 6

Method Signature

Answer 6

Different set of parameters for overloaded methods. Allows compiler to identify which method has to be called and to bind it to the method call.

Question 7

Method Overriding

Answer 7

A subclass can override a method of its superclass.

Both methods, implemented by the super- and subclass, share the same name and parameters but provide different functionality.

Question 8

Super Keyword

Answer 8

It is used to call superclass methods, and to access the superclass constructor. The most common use of the super keyword is to eliminate the confusion between superclasses and subclasses that have methods with the same name.

Question 9

Late Binding

Answer 9

Runtime determination of which class should be referenced by which method.

When a subclass object is instantiated and assigned to ta superclass variable, it is still a subclass object. 
Only the superclass methods can be used, but any overridden methods will be called as from the subclass.

Question 10

3 General Scenarios of Late Binding

Answer 10

1. The object is of the superclass type and is referenced as a superclass type.
2. The object is of the subclass type and is referenced as a subclass type.
3. The object is of the subclass type and is referenced as the superclass type.