Object Oriented Programming in Java: Objects, Classes and Constructors

Match the following with their definitions:

Objects = Entities that have state and behavior Classes = Defines shape and nature of an object Constructors = Special type of method used for object initialization Encapsulation = Concept of bundling data and methods that operate on the data

Match the following with their characteristics:

Class in Java = Logical entity containing fields, methods, constructors, blocks, nested class, and interface Object in Java = Entity that has both physical and logical existence Static Variables and Methods = Belong to the class and not to the objects of the class Visibility Modifiers = Control access levels for classes, variables, methods, and constructors

Match the following with their roles in OOP:

Class as a Template = Defines a new datatype and serves as a blueprint for creating objects Object as an Instance = Represents a specific realization of any class Encapsulation in Java = Hides the internal state of an object from the outside and only exposes the necessary functionalities Nested Class in Java = A class defined within another class

Match the following with their descriptions:

Fields in a Class = Variables that represent attributes or data associated with the class Methods in a Class = Functions that define behavior or actions of the class Blocks in a Class = Used for initializing variables and are executed when an instance of the class is created Nested Class and Interface in Java = Classes or interfaces defined within another class Signup and view all the answers

Match the following with their examples:

Tangible Objects = Physical entities like chair, bike, marker, pen, table, car Intangible Objects = Entities like banking system, music, apps Signup and view all the answers

Match the following characteristics with their definitions:

State = Represents the data (value) of an object Behavior = Represents the behavior (functionality) of an object Identity = A unique ID used internally by the JVM to identify each object uniquely Class = A group of objects with common properties Signup and view all the answers

Match the following terms with their descriptions:

Object = Represents an instance of a class with state and behavior Class = A user-defined template or blueprint from which objects are created Reference Variable = Variable that refers to the memory location of an object Heap Memory = Memory area where all objects get memory allocation at runtime Signup and view all the answers

Match the following code components with their definitions:

Field = Data member or instance variable within a class Method = Code that operates on the data of a class, defining its interface and functionality Instance Variable = Variables that belong to each instance of a class Parameter-list = List of parameters passed to a method for processing Signup and view all the answers

Match the following concepts with their examples:

Object Construction = Allocation of memory at runtime using the new keyword in Java Multiple Objects = Creation of more than one instance of a class Modify Attributes = Ability to change attribute values of an object Reference Variable Object = Variable used to refer to an object and access its members Signup and view all the answers

Match the following terms with their outputs:

Main myObj.x = 5 System.out.println(s1.name) = null System.out.println(myObj1.x) = 5 System.out.println(s1.id) = 0 Signup and view all the answers

What is the purpose of a class in Java?

A class in Java defines the shape and nature of an object and serves as a template for creating objects of that type. Signup and view all the answers

Explain the difference between a class and an object in Java.

A class in Java is a logical entity, while an object is both a physical and logical entity. Signup and view all the answers

What can a class in Java contain?

A class in Java can contain fields, methods, constructors, blocks, nested classes, and interfaces. Signup and view all the answers

How would you define an object in Java?

An object in Java is an entity that has both state and behavior. Signup and view all the answers

What is the fundamental concept behind object-oriented programming in Java?

The fundamental concept is to design a program using objects and classes to encapsulate data and methods. Signup and view all the answers

What are the three characteristics of an object in Java?

State, Behavior, Identity Signup and view all the answers

Explain the difference between a class and an object in Java.

A class is a template or blueprint from which objects are created, while an object is an instance of a class with specific values for its properties. Signup and view all the answers

How is memory allocated to objects in Java, and which memory area do objects get memory in?

Memory is allocated to objects at runtime using the 'new' keyword, and all objects get memory in the Heap memory area. Signup and view all the answers

What is the output of the following Java code?

public class Main { int x = 5; public static void main(String[] args) { Main myObj = new Main(); System.out.println(myObj.x); } }

5 Signup and view all the answers

How can you create and access attributes of multiple objects of the same class in Java?

You can create multiple objects of a class using the class name, and access their attributes using the dot syntax. Signup and view all the answers

Object Oriented Programming in Java: Objects, Classes and Constructors

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Questions and Answers

Match the following with their definitions:

Match the following with their characteristics:

Match the following with their roles in OOP: