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 : C

Explaination

Correct syntax is public static void main(String[] args).

Q 2 - Can we have two public classes in one java file?

A - True

B - False

Answer : B

Explaination

No, a java file can contain only one public class.

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

A - 0.0d

B - 0.0f

C - 0

D - not defined

Answer : A

Explaination

double variable has default value of 0.0d if defined as an instance/static variable.

Answer : B

Explaination

Polymorphism is the ability of an object to take on many forms. The most common use of polymorphism in OOP occurs when a parent class reference is used to refer to a child class object.

Answer : A

Explaination

Variables defined inside methods, constructors or blocks are called local variables. The variable will be declared and initialized within the method and it will be destroyed when the method has completed.

Q 7 - Dynamic binding uses which information for binding?

A - type.

B - object.

C - Both of the above.

D - None of the above.

Answer : B

Explaination

Dynamic binding uses object information for binding.

Answer : A

Explaination

After a thread is started, via its start() method of the Thread class, the JVM invokes the thread's run() method when the thread is initially executed.

Q 9 - Which arithmetic operations can result in the throwing of an ArithmeticException?

A - / , %

B - * , +

C - ! , -

D - >>, <<

Answer : A

Explaination

Integer / and % can result in the throwing of an ArithmeticException.

Q 10 - Which of the following is Faster, StringBuilder or StringBuffer?

A - StringBuilder

B - StringBuffer

C - Both of the above.

D - none of the above.

Answer : A

Explaination

StringBuilder is faster than StringBuffer.

java_questions_answers.htm
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