final class in java example program
Why do we use final class in Java?
final class can avoid breaking the public API when you add new methods it would break the client code. If we had used final class Base instead, the client wouldn't have been able to inherit, and the method addition wouldn't break the API. In java final keyword uses for below occasions.
How do I declare a class's methods final?
You can declare some or all of a class's methods final. You use the final keyword in a method declaration to indicate that the method cannot be overridden by subclasses. The Object class does this—a number of its methods are final.
What is a final class in JDK?
1. A final class is introduced in JDK to prevent the inheritance of class. Suppose I have a class that has some personal or secured information and you want any class should not extend that class. Then you should use the final keyword with class. 2. To create an immutable class then the final keyword is mandatory.
Can a class subclass a final class?
We create a new instance of B class, and call its f () method. Then we change the values of i and j attributes. The values of the final class can change, but if we try to extend the final class from another one, an error will occur, because classes cannot subclass a final class.
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