Object has 3 characteristics:

• State:: State represents an object's data (value).
• Behavior : Behavior shows how a thing behaves (or how it functions or work), such as a object car have behaviors such as accelerating, braking, and turning.
• Identity :An object's identity is often implemented via a unique ID. The value of the ID cannot be seen by an outside user. The JVM, however, makes use of it internally to individually identify each object.
• For Example, Car is an object. Its name is Nano; color is red, known as its state. It is used to drive, so drive is its behavior.

What is Class in Java

• A class serves as an object's design guide. Before creating an object, the class must be declared.
• The class might be thought of as a rough drawing or prototype for a house. It includes all of the information on the floors, doors, windows, etc. We construct the house in accordance with these descriptions. The item is a house.
• We may produce several objects from a class since numerous houses can be constructed using the same description.
• In Java, a class can include:




• Fields:
• Methods
• Constructors
• Blocks
• interface
• Nested class

Class structure

• Here, fields (variables) represent the state of object and methods represent the behavior of object
• fields are used to store data
• Methods are used to perform some operations





 // Java  program using class and object   

class Car {	   
    public int gear = 2; // state 
  
    public void braking()  // behavior 
    {
      System.out.println("Car braks Working");
    }
}
  

• In the preceding example, we defined a class called Car. It has a gear field and a braking method (). Car is a prototype in this context. We can now use the prototype to build an unlimited number of Car. Furthermore, all of the Car will use the prototype's fields and methods.

Example of class and object

Java example of class and object

 // Java  program using class and object   

class Student2{  
	String Stu_name ;   
	int Stu_id;
	 void insert(String stu_name, int stu_id) {
		Stu_name = stu_name;
		Stu_id = stu_id;
	}  
	public void Display() {
		System.out.println(Stu_id);
		System.out.println(Stu_name+"\n");
	}
} 
class Student{  
	public static void main(String args[]){  
		  Student2 studentObject1=new Student2();
		  Student2 studentObject2=new Student2();
		  studentObject1.insert("Dr Alok Raja ", 40139522);
		  studentObject1.Display();
		  studentObject2.insert("Mrs Anita Sinha", 40139522);
		  studentObject2.Display();
	 } 
}  

40139522  

Dr Alok Raja 

40139532 

Mrs Anita Sinha 

Comparison Chart

Difference between object and class are mention below