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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 - What is correct syntax for main method of a java class?

A - public static int main(String[] args)

B - public int main(String[] args)

C - public static void main(String[] args)

D - None of the above.

Answer : C

Explaination

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

Q 2 - What is the size of short variable?

Answer : B

Explaination

The short data type is represented by 16-bit signed two's complement integer.

Minimum value: -32,768

Maximum value: 32,767

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

Answer : A

Explianation

Byte variable has default value of 0 if defined as an instance/static variable.

Q 4 - Which of the following is true about super class?

A - Variables, methods and constructors which are declared private can be accessed only by the members of the super class.

B - Variables, methods and constructors which are declared protected can be accessed by any subclass of the super class.

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

D - All of the above.

Answer : D

Explaination

All of the above are correct.

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.

Q 6 - What is TreeSet Interface?

A - It is a Set implemented when we want elements in a tree based order.

B - It is a Set implemented when we want elements in a sorted order.

C - It is a Set implemented when we want elements in a binary tree format.

D - It is a Set implemented when we want elements in a hiearchical order.

Answer : B

Explaination

TreeSet is a Set implemented when we want elements in a sorted order.

Q 7 - When static binding occurs?

A - Static binding occurs during Compile time.

B - Static binding occurs during load time.

C - Static binding occurs during runtime.

D - None of the above.

Answer : A

Explaination

Static binding occurs during Compile time.

Q 8 - Does garbage collection guarantee that a program will not run out of memory?

A - True.

B - False.

Answer : B

Explaination

Garbage collection does not guarantee that a program will not run out of memory. It is possible for programs to use up memory resources faster than they are garbage collected. It is also possible for programs to create objects that are not subject to garbage collection.

Q 9 - What will happen if static modifier is removed from the signature of the main method?

A - Compilation Error.

B - RunTime Error: NoSuchMethodError.

C - Program will compile and run without any output.

D - Program will compile and run to show the required output.