Java Online Quiz

Q 1 - What is a class in java?

A - 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.

B - class is a special data type.

C - class is used to allocate memory to a data type.

D - none of the above.

Q 2 - Can we have multiple classes in same java file?

A - True

B - False

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

A - 0

B - 0.0

B - null

B - undefined

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.

Q 5 - What is local variable?

A - Variables defined inside methods, constructors or blocks are called local variables.

B - Variables defined outside methods, constructors or blocks are called local variables.

C - Static variables defined outside methods, constructors or blocks are called local variables.

D - None of the above.

Q 6 - What kind of variables a class can consist of?

A - class variables, instance variables

B - class variables, local variables, instance variables

C - class variables

D - class variables, local variables

Q 7 - What is function overriding?

A - If a subclass uses a method that is already provided by its parent class, it is known as Method Overriding.

B - If a subclass provides a specific implementation of a method that is already provided by its parent class, it is known as Method Overriding.

C - Both of the above.

D - None of the above.

Q 8 - What are Wrapper classes?

A - These are classes that allow primitive types to be accessed as objects.

B - These are classes that wraps functionality of an existing class.

C - Both of the above.

D - None of the above.

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

A - / , %

B - * , +

C - ! , -

D - >>, <<

Q 10 - which operator is considered to be with highest precedence?

A - () , []

B - =

C - ?:

D - %