Solution: The Duplicate Detector

import java.util.Objects;
public class InventoryApp {
    static class Product {
        private int id;
        private String name;
        public Product(int id, String name) {
            this.id = id;
            this.name = name;
        }
        // 1. Override equals to compare IDs
        @Override
        public boolean equals(Object obj) {
            // Self-check
            if (this == obj) return true;
            
            // Null and Type check
            if (obj == null || getClass() != obj.getClass()) return false;
            
            // Cast and Compare
            Product other = (Product) obj;
            return this.id == other.id;
        }
        // 2. Override hashCode to match equals
        @Override
        public int hashCode() {
            // Simple approach: return the unique ID
            return Objects.hash(id);
        }
    }
    public static void main(String[] args) {
        Product p1 = new Product(101, "Gaming Laptop");
        Product p2 = new Product(101, "Gaming Laptop");
        System.out.println("Comparison Result:");
        System.out.println("p1.equals(p2): " + p1.equals(p2));
        
        boolean hashMatch = p1.hashCode() == p2.hashCode();
        System.out.println("Hash codes match: " + hashMatch);
    }
}