Given the following piece of code:
public class School{
public abstract double numberOfStudent();
}
which of the following statements is true?
public class School{
public abstract double numberOfStudent();
}
A. The keywords public and abstract cannot be used together.
B. The method numberOfStudent() in class School must have a body.
C. You must add a return statement in method numberOfStudent().
D. Class School must be defined abstract.
Answer: Option D
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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
in a class if any of the method is abstract then that class should be declared abstract