Day 3 Wipro

Which keyword is used for inheritance in Java?

• this

• super

• extends

• implements

How many classes can a Java class extend?

• One

• Two

• Unlimited

• Zero

What happens if a subclass does not explicitly call super()?

• Error occurs

• JVM inserts it automatically

• Parent constructor is never called

• Program doesn’t compile

Which class is at the top of the inheritance hierarchy in Java?

• Object 

• Superclass 

• Main 

• System

Which access modifier allows inheritance outside the package?

• private 

• public

• protected

• default

What will happen if a class is marked final?

• It can be inherited

• It cannot be extended

• Its methods can’t be called

• It must have a constructor

Which is NOT required for method overriding?

• Same name 

• Same return type

• Same parameters

• private modifier

Can overloaded methods differ by return type only?

• Yes

• No

• Only if static 

• Only in interfaces

11. What is the output?

• A

• B

• AB

• Compile error

What keyword is used to implement an interface?

• extends 

• include 

• implements 

• interface