which of the following statements is INCORRECT?A, If a class has any abstract methods it must be declared abstract itselfB. When applied to a class, the final modifier means it cannot be sub-classedC. None of othersD. All methods in an abstract class must be declared as abstract
Question
which of the following statements is INCORRECT?A, If a class has any abstract methods it must be declared abstract itselfB. When applied to a class, the final modifier means it cannot be sub-classedC. None of othersD. All methods in an abstract class must be declared as abstract
Solution
To determine which statement is incorrect, let's analyze each option:
A. If a class has any abstract methods, it must be declared abstract itself. This statement is correct. If a class contains any abstract methods, it must be declared as abstract.
B. When applied to a class, the final modifier means it cannot be subclassed. This statement is correct. When the final modifier is applied to a class, it indicates that the class cannot be subclassed.
C. None of the others. This statement does not provide any specific information and cannot be evaluated as correct or incorrect.
D. All methods in an abstract class must be declared as abstract. This statement is incorrect. In an abstract class, not all methods need to be declared as abstract. Abstract classes can have both abstract and non-abstract methods.
Therefore, the incorrect statement is D. All methods in an abstract class must be declared as abstract.
Similar Questions
YouIndicate the false statement in the given list of statements about abstract classes.a.An abstract class cannot have non-abstract methods.b. A class containing abstract methods is called an abstract class.c Abstract methods should be implemented in the derived class.d. A class must be qualified as 'abstract class, if it contains one abstract method.
Choose the correct statements among the following:An abstract method does not have implementationAn abstract method can take either static or virtual modifiersAn abstract method can be declared only in abstract classAll of the mentioned
which of the following statement(s) is(are) true?1)An abstract class cannot have any final methods2)A final class may not have any abstract methodsA. Both statement 1 and 2B. Only statement 1C. Only statement 2D. None of them
Which of the following statements regarding abstract methods is false? _____ A. An abstract class can have instances created using the constructor of the abstract class.B. An abstract class can be extended, and an abstract class can be used as a data type.C. A subclass of a non-abstract superclass can be abstract. D. A subclass can override a concrete method in a superclass to declare it abstract.
Which of the following is FALSE about abstract classes in Java?Select one:a.A class can be made abstract without any abstract methodb.Abstract classes can have constructorsc.A class can inherit from multiple abstract classes.d.If we derive an abstract class and do not implement all the abstract methods, then the derived class should also be marked as abstract using ‘abstract’ keyword
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.