Creating Multiple Objects

Introduction

In real-world applications, we rarely deal with just one object. A school has hundreds of students, a bank has thousands of accounts, and an e-commerce website has millions of products. Instead of writing separate variables for every entity, OOP allows us to create multiple objects from a single class.

Problem Without a Class Imagine storing information for 100 students.

Each new produces an independent object with its own copy of the instance fields.

class Counter {
    int count = 0;
    void tick() { count++; }
}

public class Main {
    public static void main(String[] args) {
        Counter c1 = new Counter();
        Counter c2 = new Counter();

        c1.tick();
        c1.tick();
        c2.tick(); // c2 is unaffected by c1

        System.out.println(c1.count); // 2
        System.out.println(c2.count); // 1
    }
}