Declaring and defining classes

Classes in Java:

A class is like a blueprint or a plan.

It tells Java how to create something.

Declaring a Class:

When we say "declare a class," it's like saying, "Hey Java, I want to make something, and here's how it should look."

class Animal {

    // This is where we describe what the thing (object) should have

    String name;

    int age;

}

Here, we're declaring a class named Animal with two things it should have: a name and an age.

Defining (Creating) Objects:

Creating Objects - Making Real Things:

Once we have the plan (class), we can make real things (objects) based on that plan.

We use the new keyword to create an object.

public class Main {

    public static void main(String[] args) {

        // Creating an object of type 'Animal'

        Animal myPet = new Animal();

    }

}

Here, we've created a real thing called myPet using the Animal class.


Setting Details for Objects:

Now, we can set details for our object, just like giving values to variables.

myPet.name = "Fluffy";

myPet.age = 3;

here, We've given our pet a name ("Fluffy") and an age (3).

Creating and using objects

Using Objects:

Using Objects - Interacting with Real Things:

Now that we have our real thing (object), we can use it, just like playing with a toy.

System.out.println("My pet's name is " + myPet.name);

System.out.println("My pet is " + myPet.age + " years old");

We're asking Java to tell us about our pet's name and age.


Putting It All Together:

Imagine a Class as a Plan for Real Things:

The class is like telling Java how to make something.

Creating an object is like making a real thing based on that plan.

Setting details for the object is like customizing that real thing.

Using Objects is Like Playing:

Once we have the real thing (object), we can play with it by using its details.


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