In Java, the final keyword is used to indicate that a variable, method, or class cannot be modified after it is declared. Here’s a brief overview of the use of the final keyword in these different contexts:
Final variable: A final variable is a variable whose value cannot be changed after it is initialized. Once a final variable is assigned a value, it cannot be reassigned. This is useful for defining constants or values that should not be modified and can help to improve code safety and readability.
Final method: A final method is a method that cannot be overridden by a subclass. Once a method is marked as final, it cannot be modified or extended by any subclass. This can be useful for enforcing a specific behavior or preventing unintended changes to a method’s functionality.
Final class: A final class is a class that cannot be extended by any subclass. Once a class is marked as final, it cannot be inherited or modified in any way. This is useful for defining immutable classes or classes that should not be modified by other classes.
In general, the use of the final keyword can help to improve code safety, readability, and maintainability, by preventing unintended modifications to variables, methods, or classes. It can also provide additional guarantees about the behavior of these elements in a program, such as ensuring that a method always behaves in a specific way or that a class is always used in a specific context.