final keyword in java:-

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The "final" keyword in Java is used to create constants, define immutable variables, and prevent inheritance or overriding of methods and classes. Here are some common uses of the "final" keyword in Java:

1. Final variables: When a variable is declared as final, it cannot be modified once it has been initialized. This means that the value of the variable remains constant throughout the program's execution. Final variables are typically used to define constants that are used across the program. For example, you could declare a final variable PI with a value of 3.14159 to represent the mathematical constant pi.

2. Final methods: When a method is declared as final, it cannot be overridden by a subclass. This means that the method implementation defined in the superclass is used by all the subclasses, and cannot be changed. Final methods are typically used to enforce a specific behavior in a class hierarchy. For example, the "equals" method in the Object class is final, which means that all subclasses must use the same implementation of the equals method.

3. Final classes: When a class is declared as final, it cannot be subclassed. This means that the class cannot be extended or modified by any other class. Final classes are typically used to ensure that the class behavior remains consistent across all instances. For example, the String class in Java is final, which means that it cannot be subclassed, and its behavior remains consistent across all instances.

Overall, the "final" keyword is an important part of Java that allows you to create constants, define immutable variables, and prevent inheritance or overriding of methods and classes, helping to ensure program correctness and maintainability.