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

Answer : A

Explaination

A class is a blue print from which individual objects are created. A class can contain fields and methods to describe the behavior of an object.

Q 2 - What is the size of long variable?

A - 8 bit

B - 16 bit

C - 32 bit

D - 64 bit

Answer : D

Explaination

The long data type is represented by 64-bit two's complement integer.

Minimum value: -263

Maximum value: 263-1

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

A - '\u0000'

B - 0

C - null

D - not defined

Answer : A

Explaination

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

Q 5 - A class always has a default constructor.

A - True

B - False

Answer : B

Explaination

It is not mandatory to have a default constructor in a class.

Answer : C

Explaination

Java Runtime Environment is an implementation of the Java Virtual Machine which executes Java programs. It provides the minimum requirements for executing a Java application.

Answer : A

Explaination

If a class has multiple functions by same name but different parameters, it is known as Method Overloading.

Answer : A

Explaination

When a task invokes its yield() method, it returns to the ready state.

Answer : A

Explaination

Runtime polymorphism or dynamic method dispatch is a process in which a call to an overridden method is resolved at runtime rather than at compile-time. In this process, an overridden method is called through the reference variable of a superclass.

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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