JavaObject-Oriented Programming (OOP)

Classes and Objects in Java

Learn how to create classes and objects in Java, understand instance variables, methods, object creation, and real-world usage.

Classes and Objects in JavaLink to this section

In Java, classes and objects are the core building blocks of Object-Oriented Programming. A class defines the structure, and objects represent actual instances created from that structure.

Every Java program revolves around creating and interacting with objects.

Defining a ClassLink to this section

A class is defined using the class keyword and contains variables and methods.

Creating ObjectsLink to this section

An object is created using the new keyword.

note

Each object has its own copy of instance variables.

Instance Variables and MethodsLink to this section

Instance variables store object-specific data, while methods define actions.

They are accessed using the object reference.

tip

Instance variables get memory only when an object is created.

Multiple Objects of a ClassLink to this section

A single class can create multiple objects, each with different values.

Classes and Objects in Java
Question 1 of 5

What is used to create an object in Java?

Classes and Objects in Java

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  1. Create a class named Student with name and marks.
  2. Create two objects of the Student class with different values.
  3. Add a method to display student details.
  4. Explain how memory is allocated for objects.
  5. Identify real-world examples of classes and objects.