Java Online Quiz


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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.

Questions and Answers

Q 1 - What is the size of byte variable?

A - 8 bit

B - 16 bit

C - 32 bit

D - 64 bit

Answer : A

Explaination

The byte data type is represented by an 8-bit signed two's complement integer.

Minimum value: -128

Maximum value: 127

Q 2 - What is the size of boolean variable?

A - 8 bit

B - 16 bit

C - 32 bit

D - not precisely defined

Answer : B

Explaination

The boolean data type can take either true or false, but its "size" isn't precisely defined.

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

A - 0.0d

B - 0.0f

C - 0

D - not defined

Answer : B

Explaination

float variable has default value of 0.0f if defined as an instance/static variable.

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.

Answer : A

Explaination

A NullPointerException is thrown when calling the instance method of a null object or modifying/accessing field of a null object.

Answer : B

Explaination

Serialization is the process of writing the state of an object to a byte stream.

Q 9 - Is it necessary that each try block must be followed by a catch block?

A - True.

B - False.

Answer : B

Explaination

It is not necessary that each try block must be followed by a catch block. It should be followed by either a catch block or a finally block.

Q 10 - which operator is considered to be with highest precedence?

A - () , []

B - =

C - ?:

D - %

Answer : A

Explaination

Postfix operators i.e () [] . is at the highest precedence.

java_questions_answers.htm
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