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Java Classes and Object

What is Class?

Class is a blueprint or a template that allows us to define the properties (attributes or fields) and behaviors (methods or functions) that the objects will have.

Note:- In simpler terms, a class is a user-defined data type that encapsulates data and the operations that can be performed on that data.

 

1.  Attributes (Fields): These are variables that represent the characteristics or properties of an object. Fields define the state of an object.

Example
 

public class Dog {
    // Fields
    String name;
    int age;
    String breed;
}

Note:- In this example, the Dog class has fields such as name, age, and breed.

 


2. Methods (Member Functions): These are functions that define the behavior of an object. Methods perform actions or operations related to the object's state.

Example

public class Dog {
     // Method
    public void bark() {
        System.out.println("Woof! Woof!");
    }
}

Note:- The Dog class has a method named bark that represents the action of a dog barking.

 

What is Object?

An object is an instance of a class, as we know class serves as a blueprint or template for creating objects, meanwhile an object is a concrete instantiation of that blueprint.

Example

public class Dog {
    // Fields
    String name;
    int age;
    String breed;
     // Method
    public void bark() {
        System.out.println("Woof! Woof!");
    }
}
public class Main{
	public static void main(String[] args){
		// Creating an object and invoking a method
		Dog myDog = new Dog();
		myDog.bark(); // Invoking the bark method of the Dog class
	}
}

Note :- we can multiple objects for a single class, it's depend on requirements.

 

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