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Modern Java: From Fundamentals to Advanced Architecture

Solution: The Expired Product Purge

Explore how to implement a reliable expired product purge in Java by iterating through data collections, applying conditional logic, and safely removing items using an iterator. Understand practical use of Lists and Iterators to manage data without errors.

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Java 25
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class WarehouseManager {
    static class Product {
        String name;
        int stock;
        String status;
        public Product(String name, int stock, String status) {
            this.name = name;
            this.stock = stock;
            this.status = status;
        }
        @Override
        public String toString() {
            return name + " (Stock: " + stock + ", Status: " + status + ")";
        }
    }
    public static List<Product> loadProducts(String filePath) {
        List<Product> products = new ArrayList<>();
        try {
            List<String> lines = Files.readAllLines(Path.of(filePath));
            
            // Start loop at 1 to skip the CSV header row
            for (int i = 1; i < lines.size(); i++) {
                String line = lines.get(i);
                String[] parts = line.split(",");
                
                // Parse CSV columns
                String name = parts[0].trim();
                int stock = Integer.parseInt(parts[1].trim());
                String status = parts[2].trim();
                
                products.add(new Product(name, stock, status));
            }
        } catch (IOException e) {
            System.out.println("Error reading file: " + e.getMessage());
        }
        return products;
    }
    public static void removeUnsellableItems(List<Product> inventory) {
        Iterator<Product> it = inventory.iterator();
        
        while (it.hasNext()) {
            Product p = it.next();
            
            // Remove if Stock is 0 OR Status is Expired
            if (p.stock == 0 || p.status.equals("Expired")) {
                it.remove();
            }
        }
    }
    public static void main(String[] args) {
        System.out.println("--- Loading Inventory ---");
        List<Product> inventory = loadProducts(filePath);
        System.out.println("Loaded " + inventory.size() + " items.");
        
        // Print first 5 to verify loading
        if (!inventory.isEmpty()) {
             System.out.println("First 5 items: " + inventory.subList(0, Math.min(inventory.size(), 5)));
        }
        System.out.println("\n--- Purging Unsellable Items ---");
        removeUnsellableItems(inventory);
        System.out.println("Purge complete.");
        System.out.println("Remaining items: " + inventory.size());
        
        System.out.println("Active Inventory:");
        for (Product p : inventory) {
            System.out.println(" - " + p);
        }
    }
}
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