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 - 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 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.

Answer : B

Explaination

String object is immutable so that once it is created a String object cannot be changed. Since String is immutable it can safely be shared between many threads which are considered very important for multithreaded programming.

Answer : A

Explaination

Class variables are variables declared with in a class, outside any method, with the static keyword.

Q 6 - Can be constructor be made private?

A - True.

B - False.

Answer : A

Explaination

Yes, class with private constructor can not instantiated using new keyword.

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 - Is it necessary that each try block must be followed by a finally block?

A - True.

B - False.

Answer : B

Explaination

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

Q 10 - Which of the following is a marker interface?

A - serializable

B - comparable

C - cloneable

D - none of the above.

Answer : A

Explaination

serializable is a marker interface.

java_questions_answers.htm
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