Java-Classes and Objects

Classes and objects are the two main aspects of object-oriented programming(OOP)

1. class is a template or blueprint for an objects. it’s describes the states and behaviors of it’s object
2. An object is an instance of a class. Object has states and behaviors

For example:- In real life, a car is an object. The car has attributes, such as weight and color, and methods, such as drive and brake.

A Class is like an object constructor, or a “blueprint” for creating objects.

Car class

Create the class ( Car as a class)

class Car{
     String color
     String size;
     String model;
     String engine;
}
    //Save it as Car.java 

Adding method

class Car{
     String color;
     String size;
     String model;
     String engine;

void start(){    //This is a simple method to display a text
   System.out.println("BMW");
  }
}

Create an object

class Car{
String color;
String size;
String model;
String engine;

void start(){
System.out.println("car1");
}

public static void main(string args[]){
Car car1=new Car(); // create an object.
}
}

Assign values to instance variables

class Car{
     String color;
     String size;
     String model;
     String name;

void start(){ 
   System.out.println("car1");
  }

 Public static void main(string args[]){
        Car car1=new Car();

car1.name = "BMW";
car1.size = "4319 x 1799 x 1434 mm";
car1.color = "black";
car1.model = "BMW i7";
 }
}

Display the value of instance variables of the object

class Car{
     String color;
     String size;
     String model;
     String name;

void start(){ 
   System.out.println("car1");
  }

 public static void main(string args[]){
        Car car1=new Car();

car1.name = "BMW";
car1.size = "4319 x 1799 x 1434 mm";
car1.color = "black";
car1.model = "BMW i7";

System.out.println ("car1 name:"+ car1.name);
System.out.println ("car1 name:"+ car1.size);
System.out.println ("car1 name:"+ car1.model);
System.out.println ("car1 name:"+ car1.color);

 }
}

Output

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