Object & Class in java

In Java, objects and classes are fundamental concepts that allow for object-oriented programming.A class is a blueprint or template for creating objects. It defines the properties and behaviors of objects of that class. The class consists of variables, called fields, and methods that define the behavior of the objects. For example, a class called “Car” could have fields such as “make”, “model”, “year”, and “color”, and methods such as “start”, “stop”, and “accelerate”.

Here is an example of a class in Java:

public class Car {
    String make;
    String model;
    int year;
    String color;

    public void start() {
        // code to start the car
    }

    public void stop() {
        // code to stop the car
    }

    public void accelerate() {
        // code to accelerate the car
    }
}

An object is an instance of a class. It is created using the new keyword followed by the name of the class. Once an object is created, its fields can be accessed and modified, and its methods can be called.

Here is an example of creating an object of the Car class:

Car myCar = new Car();

In this example, myCar is an object of the Car class. Its fields can be accessed and modified using dot notation, like this:

myCar.make = "Toyota";
myCar.model = "Camry";
myCar.year = 2022;
myCar.color = "red";

Its methods can be called using dot notation as well, like this:

myCar.start();
myCar.accelerate();
myCar.stop();

In conclusion, objects and classes are essential concepts in Java that enable object-oriented programming. A class is a blueprint for creating objects, defining their properties and behaviors. An object is an instance of a class, with its own set of fields and methods that can be accessed and modified. Classes and objects provide a powerful way to structure and organize code, and to model real-world objects and systems.