Object Oriented Programming in Java: Objects, Classes and Constructors

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

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

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

<p>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</p> Signup and view all the answers

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

<p>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</p> Signup and view all the answers

<p>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</p> Signup and view all the answers

<p>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</p> Signup and view all the answers

<p>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</p> Signup and view all the answers

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

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

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

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

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

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

<p>State, Behavior, Identity</p> Signup and view all the answers

<p>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.</p> Signup and view all the answers

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

<p>5</p> Signup and view all the answers

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