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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 - Which of the following is not a keyword in java?

Answer : B

Explaination

Boolean is a class and is not a keyword.

Q 2 - What is the size of int variable?

Answer : C

Explaination

The int data type is represented by 32-bit signed two's complement integer,

Minimum value: -231

Maximum value: 231-1

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

Answer : C

Explaination

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

Q 4 - Which of the following stands true about default modifier of class members?

A - By default, variables, methods and constructors can be accessed by subclass only.

B - By default, variables, methods and constructors can be accessed by any class lying in any package.

C - By default, variables, methods and constructors can be accessed by any class lying in the same package.

D - None of the above.

Answer : C

Explaination

By default, variables, methods and constructors can be accessed by any class lying in the same package.

Q 5 - What is instance variable?

A - Instance variables are static variables within a class but outside any method.

B - Instance variables are variables defined inside methods, constructors or blocks.

C - Instance variables are variables within a class but outside any method.

D - None of the above.

Answer : C

Explaination

Instance variables are variables within a class but outside any method. These variables are instantiated when the class is loaded.

Q 6 - Composition represents

A - HAS-A relationship.

B - IS-A relationship.

Answer : A

Explaination

Holding the reference of the other class within some other class is known as composition. It represents a HAS-A relationship. For example, a Student has a Pen. Here Student class has Pen as its instance variable.

Q 7 - Static binding uses which information for binding?

A - type.

B - object.

C - Both of the above.

D - None of the above.

Answer : A

Explaination

Static binding uses type information for binding.

Q 8 - What is a transient variable?

A - A transient variable is a variable which is serialized during Serialization.

B - A transient variable is a variable that may not be serialized during Serialization.

C - A transient variable is a variable which is to be marked as serializable.

D - None of the above.

Answer : B

Explaination

A transient variable is a variable that may not be serialized during Serialization and which is initialized by its default value during de-serialization.

Q 9 - Can try statements be nested?

A - True.

B - False.