[PDF] a final class can be abstract

therefore, a final abstract combination is illegal for classes. Hence, a final class cannot contain abstract methods whereas an abstract class can contain a final method.
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  • Can we use final in abstract?

    Similarly, you cannot override final methods in Java. But, in-case of abstract, you must override an abstract method to use it. Therefore, you cannot use abstract and final together before a method.

  • Can a class be abstract?

    An abstract class is a class that is declared abstract —it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed. When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class.
  • Because if a class is defined final it cannot be overridden . But if you create an abstract class then it should be overridden by the subclass . Hence an abstract class cannot be final. You can't declare abstract class a final because if u declare you can't modified it , nor derived any other class.25 nov. 2016
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Classes in Java

and concrete classes. ? An abstract class is a class that does not implement all its methods (bodies are missing). ? An abstract class cannot be 



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The abstract modifier for creating abstract classes and methods. A class cannot be both abstract and final. sinceafinalclasscannotbeextended.



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We can make Person an abstract class: Person and must use this implementation: final method …}; class ... (Class can have abstract final or no keyword).



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Since must be overridden by descendent class (final would prevent this). • A non-abstract method of an abstract class can call abstract methods of the class.



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Can we force a subclass to override a method inherited from superclass? Yes we can leverage the power of abstract class. Page 17. Concrete Classes.



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You prevent a class from being subclassed by declaring the class final. You would use abstract classes and abstract methods to describe generic.



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Is that only difference between an interface and an abstract class? It can have Constructor as well. The final modifier applies to classes methods



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No methods of a final class may be abstract since a final class cannot be subclassed. •. Related Topics final Java Keyword private Java Keyword.



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Can't subclass A. // } Abstract modifier: The abstract modifier is placed before classes or methods. It cannot be applied to variables. Abstract class : ...