Object-Oriented Programming in Java: Classes and Objects

A user-defined data type which defines its properties and functions.

An object is a run-time entity and an instance of a class.

By using the 'class' keyword followed by the class name and its properties and functions.

<p>To display the name and age of the student.</p> Signup and view all the answers

<p>A class is a blueprint for creating objects, while an object is an instance of a class.</p> Signup and view all the answers

<p>It creates a new object of the 'Student' class and assigns it to the reference variable 's1'.</p> Signup and view all the answers

<ol> <li>pass the current object as a parameter to another method 2. refer to the current class instance variable</li> </ol> Signup and view all the answers

<p>A constructor is a special method invoked automatically at the time of object creation to initialize the data members of new objects. Constructors have the same name as the class, don’t have a return type, and are only called once, at object creation.</p> Signup and view all the answers

<p>A non-parameterized constructor, also known as a no-argument constructor, is a constructor that has no arguments and is invoked at the time of creating an object. If not created explicitly, it is created by default by Java.</p> Signup and view all the answers

<p>A parameterized constructor is a constructor that has parameters and is used to provide different values to distinct objects.</p> Signup and view all the answers

<p>A copy constructor is an overloaded constructor used to declare and initialize an object from another object. In Java, there is only a user-defined copy constructor.</p> Signup and view all the answers

<p>The 'this' keyword in the context of constructors is used to refer to the current class instance variable.</p> Signup and view all the answers

<p>Polymorphism in Java is the ability to present the same interface for differing underlying forms (data types). It allows different classes to have different underlying data while presenting the same interface.</p> Signup and view all the answers

<p>The types of polymorphism in Java are: 1. Compile Time Polymorphism (Static) 2. Runtime Polymorphism (Dynamic)</p> Signup and view all the answers

<p>Compile time polymorphism in Java refers to the polymorphism that is implemented at compile time. An example of compile time polymorphism is method overloading.</p> Signup and view all the answers

<p>Method overloading in Java refers to the ability to define multiple methods with the same name but different parameters within the same class. The methods can have different numbers or types of parameters.</p> Signup and view all the answers