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Top 10 Advance Java Interview questions?   What are the differences between abstract classes and interfaces in Java? What is the difference between ArrayList and LinkedList in Java? What is the purpose of the finalize() method in Java? What is polymorphism in Java and how is it achieved? What are the different types of inner classes in Java? What is the difference between static and non-static methods in Java? What are the different types of exceptions in Java and how do they differ? What is the difference between checked and unchecked exceptions in Java? How does Java handle multithreading and synchronization? What are the different types of JDBC drivers in Java and how do they differ?
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What is the purpose of the final keyword in Java, and where can it be used?

 The main purpose of the final keyword in Java, and where can it be used?

In Java, the final keyword is used to define an entity that cannot be changed or overridden. Here are some uses of the final keyword:

  1. Final variables: A final variable is a constant whose value cannot be changed once it is initialized. Final variables are typically used for constants that are used throughout the program, such as pi or e.

  2. Final methods: A final method is a method that cannot be overridden by a subclass. Final methods are typically used to ensure that the behavior of a method is consistent across all subclasses.

  3. Final classes: A final class is a class that cannot be extended by a subclass. Final classes are typically used to ensure that the behavior of a class is consistent and cannot be modified by a subclass.

  4. Final parameters: A final parameter is a parameter whose value cannot be changed once it is initialized in the method. Final parameters are typically used to ensure that the parameter value is not accidentally changed within the method.

The final keyword is used to ensure that an entity cannot be changed, which can improve code safety and maintainability. By using the final keyword, you can ensure that constants, methods, and classes behave consistently and cannot be changed by accident.

In Java, the final keyword is used to define entities that cannot be changed after they are initialized. Here are some ways in which the final keyword can be used:

  1. Final variables: Final variables are variables that cannot be changed after they are initialized. Once a final variable is assigned a value, it cannot be changed. Final variables must be initialized either when they are declared or in a constructor.

  2. Final methods: Final methods are methods that cannot be overridden by subclasses. This can be useful in situations where a method should not be changed by subclasses.

  3. Final classes: Final classes are classes that cannot be subclassed. This is useful when a class should not be extended.

  4. Final parameters: Final parameters are parameters that cannot be changed within a method. This is useful when you want to ensure that a parameter is not modified within the method.

  5. Finalizer methods: Finalizer methods are methods that are called by the garbage collector before an object is destroyed. However, finalizer methods are generally discouraged in modern Java programming because they can cause performance and reliability issues.

In summary, the final keyword is used to define entities that cannot be changed after they are initialized. It can be used to define final variables, methods, classes, parameters, and finalizer methods. By using final, you can ensure that certain entities remain constant and cannot be modified.


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