Polymorphism in Java
Polymorphism in Java - Important Points
| 16. | Which of the following is an example of a superclass? |
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A. Dog
B. Animal
C. Mammal
D. None of the above
View Answer Discuss Work SpaceAnswer: option b
Explanation:
A superclass is a class that is extended by another class. In this example, the Animal class is a superclass that can be extended by subclasses like Dog and Mammal.
| 17. | Which of the following is an example of a subclass? |
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A. Dog
B. Animal
C. Mammal
D. None of the above
View Answer Discuss Work SpaceAnswer: option a
Explanation:
A subclass is a class that extends another class. In this example, the Dog class is a subclass that extends the Animal class.
| 18. | Which of the following is an example of method hiding? |
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A. public void print() {}
B. public static void print() {}
C. public final void print() {}
D. None of the above
View Answer Discuss Work SpaceAnswer: option b
Explanation:
Method hiding is the process of defining a static method in a subclass that has the same name and signature as a static method in its superclass. In this example, the print method is a static method that is defined in the subclass and hides the static method with the same name in the superclass.
| 19. | Which of the following is true about polymorphism and inheritance? |
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A. Polymorphism and inheritance are two different concepts in Java
B. Polymorphism and inheritance are closely related concepts in Java
C. Polymorphism is a subtype of inheritance in Java
D. None of the above
View Answer Discuss Work SpaceAnswer: option b
Explanation:
Polymorphism and inheritance are closely related concepts in Java. Polymorphism can be achieved through inheritance and method overriding, and inheritance is the mechanism by which subclasses can inherit and extend the properties and behavior of their parent classes.
| 20. | Which of the following is an example of an abstract class? |
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A. Animal
B. Dog
C. Mammal
D. None of the above
View Answer Discuss Work SpaceAnswer: option a
Explanation:
An abstract class is a class that cannot be instantiated and is often used as a superclass for other classes. In this example, the Animal class could be an abstract class that provides a common set of properties and methods for its subclasses.