OOP JAVA

Question 1

........is the programming technique to write programs based on the real world objects.

Accepted Answer

OOP

Question 2

Creation of an object is not possible with an abstract class, but it can be inherited.

Accepted Answer

True

Question 3

It’s possible to extend interfaces to other interfaces.

Accepted Answer

True

Question 4

It is a concept where one class shares the structure and behavior defined in another class.

Accepted Answer

Inheritance

Question 5

Abstract methods can be declared private or final

Accepted Answer

False

Question 6

-------is the implementation in the superclass by providing the same method name, same parameter, and same return type.

Accepted Answer

Method overriding

Question 7

The ------ variable is used to refer to the common property of all objects (that is not unique for each object)

Accepted Answer

Static

Question 8

Abstract methods can provide a method body/implementation in the abstract class or interface it is declared

Accepted Answer

False

Question 9

Which of the following related to method overriding is incorrect?

Accepted Answer

The method must have different return type from the parent class

Question 10

Can an abstract class have only non-abstract methods?

Accepted Answer

True

Question 11

Which one of them is not related to Constructor

Accepted Answer

Its name may or may not be same as class name

Question 12

------------ is when reference type is a parent class/interface and object type is child.

Accepted Answer

Method hiding

Question 13

We cannot add instance or static variables into abstract class

Accepted Answer

False

Question 14

Which class is the superclass for all the classes?

Accepted Answer

Object

Question 15

What interfaces cannot have?

Accepted Answer

constructor

Question 16

It is the blueprint/plan/template that describes the details of an object.

Accepted Answer

Class

Question 17

It is a method used to initialize the state of an object, and it gets invoked at the time of object creation.

Accepted Answer

Constructor

Question 18

The first --- class that extends an abstract class must provide an implementation for all the inherited abstract methods

Accepted Answer

Concrete class

Question 19

Can a method be abstract and final?

Accepted Answer

False

Question 20

-------------- is a class which cannot be instantiated

Accepted Answer

Abstract

Question 21

What interfaces can have?

Accepted Answer

default method

Question 22

-- feature that allows a class to have more than one method having the same name, if their argument lists are different

Accepted Answer

Method overloadig

Question 23

It contains all data which is hidden. That hidden data can be restricted to the members of that class.

Accepted Answer

Encapsulation

Question 24

The -------- class must implement all abstract methods declared from the abstract class

Accepted Answer

Concrete class

Question 25

What access modifier cannot be in abstract methods

Accepted Answer

Private

Question 26

------ keyword is used to invoke the overridden method, which overrides one of its superclass methods.

Accepted Answer

super()

Question 27

Its name should be the same as a class name.It must have no return type.

Accepted Answer

Constructor

Question 28

What are basic concepts of OOPS?

Accepted Answer

Abstraction-Encapsulation- Inheritance- Polymorphism

Question 29

Which of the following related to instance method is incorrect?

Accepted Answer

We don't need to create the objects to call the intance methods.

Question 30

Which of the following related to static method is incorrect?

Accepted Answer

this and super can be used in static context.

Question 31

If the abstract class doesn’t have any abstract methods we can instantiate.

Accepted Answer

False

Question 32

It is an instance of a class. It has its own state, behavior, and identity.

Accepted Answer

Object

Question 33

Abstract methods can only be defined in abstract classes or interfaces

Accepted Answer

True

Question 34

Which of the following is not an access modifier?

Accepted Answer

static

Question 35

We can use this() and super() both in a constructor.

Accepted Answer

False

Question 36

When you declare two static methods with same name and signature in superclass and subclass then it's called --------

Accepted Answer

Method hiding

OOP JAVA

Questions 36

OOP JAVA

Questions 36