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Java Online Quiz

Following quiz provides Multiple Choice Questions (MCQs) related to Core Java. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Q 1 - Static functions can be accessed using null reference.

A - True

B - False

Answer : A

Explaination

True, Static functions can be accessed via class name or via null reference.

Q 2 - What is the size of double variable?

Answer : D

Explaination

The double data type is represented by double-precision 64-bit IEEE 754 floating point.

Q 3 - What is the default value of char variable?

Answer : A

Explaination

char variable has default value of '\u0000' if defined as an instance/static variable.

Q 4 - Which of the following is true about public access modifier?

A - Variables, methods and constructors which are declared public can be accessed by any class.

B - Variables, methods and constructors which are declared public can be accessed by any class lying in same package.

C - Variables, methods and constructors which are declared public in the superclass can be accessed only by its child class.

D - None of the above.

Answer : A

Explaination

Public access modifier is used to make variables, methods and constructors accessible to any class.

Q 5 - Inheritance represents

A - HAS-A relationship.

B - IS-A relationship.

Answer : B

Explaination

Inheritance represets IS-A relationship providing code reusablity . Consider the following statement: Circle is a Shape. Here Shape is super class and Circle is a child class extends the super class Shape.

Q 6 - What is Set Interface?

A - Set is a collection of element which contains elements along with their key.

B - Set is a collection of element which contains hashcode of elements.

C - Set is a collection of element which cannot contain duplicate elements.

D - Set is a collection of element which can contain duplicate elements.

Answer : C

Explaination

Set is a collection of element which cannot contain duplicate elements. The Set interface contains only methods inherited from Collection and adds the restriction that duplicate elements are prohibited.

Q 7 - What is true about a final class?

A - class declard final is a final class.

B - Final classes are created so the methods implemented by that class cannot be overridden.

C - It can't be inherited.

D - All of the above.