A) Method over loading: Writing 2 or more methods with the same
name, but with a difference in the method signatures is called method over
loading. In method over loading JVM understand in the method is called
depending upon the difference in the method signature.
Method overriding: writing 2 or more
methods in super & sub classes with same name & same signatures is
called method overriding. In method overriding JVM executes a method depending
on the data type of the object.
Achieving
method overloading & method overriding using instance methods is an example
of dynamic polymorphism.
Achieving
method overloading & method overriding using instance methods is an example
of dynamic polymorphism.
2) Static polymorphism: The polymorphism exhibited at compile time
is called Static polymorphism. Here the compiler knows which method is called
at the compilation. This is also called compile time polymorphism or static
binding.
Achieving
method overloading & method overriding using
1)
private 2) static 3) final methods, is an example of Static polymorphism.
Note: A final method is a method written in a final
class. A class is declared as a final is called final class.
Ex: final
class A
Note: final key word before class name prevents
inheritance. We can create sub classes to a final class.
Ex: final class A
class B extends A // invalid
à
We can not override final methods, only final methods overloading.
Converting 1 data type into another
data type is called casting.
