What is the purpose of the Final modifier in Java, and in what cases is it used?

The final modifier in Java is used to restrict modifications:

• For variables: the value can be assigned only once, after which it becomes a constant.
• For methods: the method cannot be overridden in subclasses.
• For classes: the class cannot be inherited.

Example of using final for a variable:

final int MAX_USERS = 100;

final is used to enhance code safety, prevent accidental changes, and ensure immutability.