Access Modifiers, Inheritance & Polymorphism

Which of this keyword must be used to inherit a class?

• super

• this

• extent

• extends

A class member declared protected becomes a member of subclass of which type?

• public member

• private member

• protected member

• static member

Which of these is correct way of inheriting class A by class B?

• class B + class A {}

• class B inherits class A {}

• class B extends A {}

• class B extends class A {}

What is the output of this program?

• 0

• 1

• 2

• Compilation Error

What is the output of this program?

• 2 2

• 3 3

• 2 3

• 3 2

What is the output of this program?

• 1 2

• 2 1

• Runtime Error

• Compilation Error

What is not type of inheritance?

• Single inheritance

• Double inheritance

• Hierarchical inheritance

• Multiple inheritance

what is the output?

• Base

• Derived

• compile time error

• run-time error

Output of following Java program?

• Base

  Derived

  Derived

• Base

  Base

  Derived

• Base

  Derived

  Base

• Compiler Error

Which of the following is true about inheritance in Java?

• 1, 2 and 4

• Only 1 and 2

• 1, 2 and 3

• 2, 3 and 4