JAVA_Quiz-2

What is the primary purpose of inheritance in Java?

• To increase code redundancy

• To support procedural programming

• To allow one class to acquire properties of another

• To execute Java code faster

Which keyword is used in Java to implement inheritance?

• inherits
  

• extends
  

• inheritsFrom
  

• implements

Which of the following is NOT a benefit of inheritance?

• Code reuse
  

• Data hiding
  

• Method overriding
  Runtime

• polymorphism

Which statement best describes the inheritance process in Java?

• It compiles all classes into a single program unit

• Subclass modifies private members of superclass directly

• Subclass automatically gains access to non-private members of the superclass

• Inheritance copies all methods from one class to another

Which type of inheritance is NOT supported directly in Java?

• Single
  

• Multilevel
  

• Multiple (via classes)
  

• Hierarchical

Which of the following is an example of hierarchical inheritance?

• Class A → Class B → Class C

• Class A → Class B, Class A → Class C

• Class B implements A, Class C implements A

• Class A, Class B extends C

In multilevel inheritance:

• One class inherits from multiple superclasses

• A class inherits from a class that has already inherited from another class

• Java doesn’t allow this

• The subclass overrides its constructor automatically

What happens if an abstract method is not implemented in the subclass?

• The subclass compiles normally

• The program throws a runtime error

• The subclass must also be declared abstract

• It will auto-inherit from the parent

What is an interface in Java?

• A class with no methods

• A class that only contains static methods

• A blueprint for classes with abstract methods

• A class with only constructors

Which keyword is used to implement an interface in Java?

• inherits
  

• extends
  

• interface
  

• implements