👨‍💻 Understanding Java Classes and Objects with a Human Example

In Java, classes and objects are the foundation of Object-Oriented Programming (OOP).

🔹 What is the Human Class?
A class in Java is like a blueprint.
In our case, the blueprint is a Human. Every human has:

📝 Name

🎂 Age

⚧ Gender

🎓 Qualification

Here’s the class definition:

class Human {
String name;
int age;
char gender;
String qualification;

public void getInformation() {
    System.out.println(name + " " + age + " " + gender + " " + qualification);
}

}
🔹 Creating Objects from the Human Class
Once we have the Human class blueprint, we can create actual objects (humans).

Example:

public static void main(String ar[]) {
Human bharath = new Human();
bharath.name = "Bharath K";
bharath.age = 25;
bharath.gender = 'M';
bharath.qualification = "MSc Maths";

bharath.getInformation(); // Output: Bharath K 25 M MSc Maths

}
👉 Here, bharath is an object of the Human class.
We set values for his properties and then call the method getInformation() to display them.

🔹 Creating Multiple Objects
We can also create another object from the same class:

Human mani = new Human();
mani.getInformation(); // No values assigned, so it prints: null 0 � null
⚠️ Since we didn’t assign values to Mani’s details, Java uses default values:

String → null

int → 0

char → blank (�)

🔹 Key Takeaways
Class = Blueprint (Human)

Object = Real Instance (Bharath, Mani)

Fields/Properties store data (name, age, gender, qualification)

Methods define behavior (getInformation())

If values are not set, Java assigns default values