Java Inheritance Quiz

What is the output of the following code snippet if `class B extends A` and both classes have a method `display()` that prints "A" in class A and "B" in class B, and method `display()` of class B calls `super.display()`? ```java B obj = new B(); obj.display(); ```

• A

• B

• AB

• BA

What access modifier should be used for a superclass method to ensure that it can be overridden by any subclass in any package?

• private

• protected

• public

• default

Which principle of Object-Oriented Programming is demonstrated by method overriding?

• Encapsulation

• Inheritance

• Polymorphism

• Abstraction

Which of the following is a correct way to call a superclass method from a subclass in Java?

• super.methodName();

• this.methodName();

• superclass.methodName();

• methodName();

In Java, which keyword is used to refer to the parent class of a class?

• parent

• super

• this

• base

What is method overriding in Java?

• Changing the value of a method's parameters in the subclass.

• Providing a specific implementation of a method that is already provided by its superclass.

• Removing a method from the superclass in the subclass.

• Calling a method from the superclass in the subclass.

What keyword is used to inherit a class in Java?

• extends

• implements

• inherits

• uses

Which of the following is true about the `super` keyword in Java?

• It can be used to call both methods and constructors of the superclass.

• It can only be used to call constructors of the superclass.

• It can only be used within static methods.

• It is optional when calling methods of the superclass.

Which of the following statements is true about constructors and inheritance in Java?

• A subclass inherits all the constructors of its superclass.

• A subclass must override all the constructors of its superclass.

• Constructors are not inherited.

• Only parameterless constructors are inherited.

Which of the following is true about the superclass and subclass relationship in Java?

• A subclass cannot access the private members of its superclass.

• A subclass inherits all the methods and fields from its superclass, including private fields.

• A subclass must override all the methods from its superclass.

• A superclass can inherit from a subclass.