From ae3bc4679536fadd47b8cbd3a32fdc74f71fe415 Mon Sep 17 00:00:00 2001 From: "amirM.t" Date: Wed, 20 May 2026 13:59:14 +0330 Subject: [PATCH] complete homework assignments --- src/main/java/Main.java | 38 +++++--- src/main/java/ReportGenerator.java | 141 +++++++++++++++++------------ 2 files changed, 109 insertions(+), 70 deletions(-) diff --git a/src/main/java/Main.java b/src/main/java/Main.java index 148a46e..59b02a2 100644 --- a/src/main/java/Main.java +++ b/src/main/java/Main.java @@ -6,31 +6,45 @@ import java.util.Scanner; public class Main { static ArrayList productCatalog = new ArrayList<>(); - public static void loadProducts() throws IOException{ + + public static void loadProducts() throws IOException + { InputStream input = Main.class .getClassLoader() .getResourceAsStream("products.csv"); - if (input == null) { + + if (input == null) + { throw new IOException("products.csv not found"); } + Scanner scanner = new Scanner(input); - // TODO: - // - Read each line from products.csv - // - For each line, parse productId, name, and price - // - The format of the file is like this: - // [productId],[name],[price] - // - Store Product objects in the productCatalog ArrayList + while (scanner.hasNextLine()) + { + String line = scanner.nextLine(); + String[] parts = line.split(","); + + int productId = Integer.parseInt(parts[0]); + String name = parts[1]; + double price = Double.parseDouble(parts[2]); + + Product product = new Product(productId, name, price); + productCatalog.add(product); + } + + scanner.close(); - // NOTE - // - The data in products.csv is guaranteed to be valid. } public static void main(String[] args) { - try { + try + { loadProducts(); - } catch (IOException e) { + } + catch (IOException e) + { System.err.println("Error reading products"); System.out.println("Terminating the program..."); return; diff --git a/src/main/java/ReportGenerator.java b/src/main/java/ReportGenerator.java index 8eb458b..a91616b 100644 --- a/src/main/java/ReportGenerator.java +++ b/src/main/java/ReportGenerator.java @@ -1,4 +1,9 @@ +import java.io.File; +import java.io.FileNotFoundException; import java.util.List; +import java.util.Scanner; +import java.io.FileWriter; +import java.io.IOException; public class ReportGenerator { @@ -10,74 +15,94 @@ public class ReportGenerator { private double totalDiscountValue; private int totalInvalidLines; - public ReportGenerator(String ordersFilePath, List productList) { + public ReportGenerator(String ordersFilePath, List productList) + { this.ordersFilePath = ordersFilePath; this.productList = productList; } public void processFile() { - // TODO: - // 1. Open the order details CSV file - // 2. Read the file line by line - // 3. Split each line using comma delimiter - // (each line is guaranteed to contain exactly two commas) - // 4. Each line contains exactly 3 values in the format: - // [productId],[quantity],[discountPercent] - // 5. Attempt to convert values: - // - productId -> int - // - quantity -> int - // - discountPercent -> int - // NOTE: - // - quantity and discountPercent may contain invalid characters - // (e.g., letters instead of numbers). - // - If parsing any value fails (NumberFormatException), - // the entire line must be considered invalid. - // - Use try-catch blocks and exception handling to safely - // handle parsing and validation errors without stopping - // the processing of the remaining lines. - // 6. Validate parsed values: - // - productId must be greater than 0 - // - quantity must be greater than 0 - // - discountPercent must be between 0 and 99 inclusive - // 7. Look for a Product in productList that matches productId - // 8. If no Product with that ID exists in the catalog, - // the entire line is considered invalid - // 9. If all values are valid and the product exists, calculate: - // subtotal = quantity * product price - // discountValue = subtotal * discountPercent / 100 - // finalCost = subtotal - discountValue - // 10. Update report totals: - // - totalQuantity += quantity - // - totalFinalCost += finalCost - // - totalDiscountValue += discountValue - // 11. If any parsing error, validation failure, or missing product occurs: - // - increment totalInvalidLines - // - skip the line and continue processing the next line - // 12. Close all file resources + try + { + Scanner scanner = new Scanner(new File(ordersFilePath)); + + while (scanner.hasNextLine()) + { + String line = scanner.nextLine(); + String[] parts = line.split(","); + + try + { + int productId = Integer.parseInt(parts[0]); + int quantity = Integer.parseInt(parts[1]); + int discountPercent = Integer.parseInt(parts[2]); + + if ((productId <= 0 || productId > 9) || quantity <= 0 || (discountPercent < 0 || discountPercent > 99)) + { + totalInvalidLines++; + continue; + } + + Product matchedProduct = null; + + for (Product p : productList) + { + if (p.getProductID() == productId) + { + matchedProduct = p; + break; + } + } + + if (matchedProduct == null) + { + totalInvalidLines++; + continue; + } + + double subtotal = quantity * matchedProduct.getPrice(); + double discountValue = subtotal * (discountPercent / 100.0); + double finalCost = subtotal - discountValue; + + totalQuantity += quantity; + totalFinalCost += finalCost; + totalDiscountValue += discountValue; + + } + catch (NumberFormatException e) + { + totalInvalidLines++; + } + } + + scanner.close(); + + } + catch (FileNotFoundException e) + { + System.err.println("Orders file not found"); + } } public void saveReport() { - // TODO: - // 1. Build a formatted report string - // 2. Include: - // - total quantity - // - total final cost - // - total discount value - // - total invalid lines - // 3. Create/open output report file (name it report.txt) - // 4. Write report string into file - // 5. Handle file writing exceptions - // 6. Close writer resources + String report = "========= SALES REPORT =========\n" + + "Total Quantity Sold: " + totalQuantity + "\n" + + "Total Final Cost: $" + String.format("%.2f", totalFinalCost) + "\n" + + "Total Discount Value: $" + String.format("%.2f", totalDiscountValue) + "\n" + + "Invalid Rows: " + totalInvalidLines + "\n" + + "================================"; - /* Example Structure - ========= SALES REPORT ========= - Total Quantity Sold: 42 - Total Final Cost: $1520.75 - Total Discount Value: $230.50 - Invalid Rows: 3 - ================================ - */ + try + { + FileWriter writer = new FileWriter("report.txt"); + writer.write(report); + writer.close(); + } + catch (IOException e) + { + System.err.println("Error writing report file"); + } } } \ No newline at end of file