JAVA

Which of the following statement is true about Interfaces?

• An Interface can contain constructors.

• An Interface can be instantiated.

• An Interface can extend another Interface

• An Interface is extended by a class.

................. is the class from where a subclass inherits the features.

• Class

• Sub Class

• Super Class

• None

Subclass is also called a ...........

• Derived Class

• Extended Class

• Child Class

• All the above

is an example of

• Single Inheritance

• Multiple Inheritance

• Multilevel Inheritance

• None

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

• Super

• this

• extend

• extent

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?

• 2 2

• 2 3

• 3 3

• 3 2

What is the output of this program?

• 1 2

• 2 1

• Runtime error

• Compilation error

What are the benefits of using inheritance in Java?

• Code reusability

• Increased complexity of code

• Reduced performance

• Difficult to maintain

What does an interface contain?

• Method definition

• Method declaration

• Method declaration and definition

• Method name