In Java, declaring a class abstract is useful
A. To prevent developers from further extending the class.
B. When it doesn't make sense to have objects of that class.
C. When default implementations of some methods are not desirable.
D. To force developers to extend the class not to use its capabilities.
E. When it makes sense to have objects of that class.
Answer: Option B
This Question Belongs to Java Program >> Interfaces And Abstract Classes
A. A contract specifying a set of methods that a class must implement
B. A class that cannot be instantiated
C. A class that contains only static methods
D. A subclass of the Object class
In Java, can a class implement multiple interfaces?
A. Interfaces cannot be implemented by classes
B. Only abstract classes can implement interfaces
C. No, a class can only implement one interface
D. Yes, a class can implement multiple interfaces
What is the purpose of an abstract class in Java?
A. To declare abstract methods
B. To provide a base class with common methods and fields
C. To make a class final
D. To declare abstract methods
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