What is the use of the final keyword in Java?

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In Java, the final keyword is used as a modifier to restrict the user from changing the value, method, or class definition once it has been declared. It can be applied to variables, methods, and classes, each serving a specific purpose.

1. Final Variables:
   When a variable is declared as final, its value cannot be changed once assigned. This makes the variable a constant.

2. Final Methods:
   Declaring a method as final prevents it from being overridden by subclasses. This is useful when you want to maintain consistent behavior across all subclasses.

3. Final Classes:
   A class declared as final cannot be extended (inherited). This is often used to create immutable classes or to prevent the class from being subclassed for security or design reasons.

Using final enhances security, consistency, and clarity in code. It’s especially useful in multithreaded applications to prevent accidental modifications and ensure predictable behavior.

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