Category: MCA III SEM VIDEO

when one class acquires the properties of another class then this concept is called inheritance. This is used for reuse the existing functionality.
For Example: children acquire the properties of their parents.
New class is called sub class and existing class is called super class.

Final keyword can be used:
1.With class name 2.With method name 3.With variable name

Uses of final Keyword:
1. To prevent Inheritance: If we want to prevent a class from being inherited then we use final keyword.

2. To prevent Overriding: If we want that method should not be overridden by sub class then we use final keyword..

3. To make the value of variable as constant: If we make the variable final then this will be treated as constant its value remains unchanged.

When two or more functions have same name but different parameter list then this concept is called method overloading.Number,type and order of parameters can be different.Return type of method can be same or different.It is a mechanism to achieve polymorphism in javaWhen we want to perform different task from one method then we use concept of overloading

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