What is the use of final class in java

Question

Actually I am new to programming, so I wonder if programmers actually use this on their program.

Answer 1

The final keyword is used to restrict the user.

A final class can be used when you intend not to extend the class. For example, let's say there is a class "password", and you want that nobody can extend that class in your project. In this case, make your class FINAL. If you or somebody else want to extend that class in future then it shouldn't be FINAL.
But this analysis should be done long before writing code; because you can't go back and make it extensible once you mark it as FINAL.

Answer 2

In Java, items with the final modifier cannot be changed!

This includes final classes, final variables, and final methods:

• A final class cannot be extended by any other class
• A final variable cannot be reassigned another value
• A final method cannot be overridden