From f150ff4d87fd91d98c9d64470c2936d33216ea71 Mon Sep 17 00:00:00 2001 From: Faraz Ardeh Date: Tue, 16 Jun 2026 16:57:39 +0330 Subject: [PATCH] Complete Home Work 6 and file handling tasks --- src/main/java/Main.java | 18 ++--- src/main/java/ReportGenerator.java | 121 +++++++++++++++-------------- 2 files changed, 73 insertions(+), 66 deletions(-) diff --git a/src/main/java/Main.java b/src/main/java/Main.java index 148a46e..b5ba8da 100644 --- a/src/main/java/Main.java +++ b/src/main/java/Main.java @@ -15,15 +15,15 @@ public class Main { } 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 - - // NOTE - // - The data in products.csv is guaranteed to be valid. + 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]); + productCatalog.add(new Product(productId, name, price)); + } + scanner.close(); } public static void main(String[] args) diff --git a/src/main/java/ReportGenerator.java b/src/main/java/ReportGenerator.java index 8eb458b..5ccb9c3 100644 --- a/src/main/java/ReportGenerator.java +++ b/src/main/java/ReportGenerator.java @@ -1,3 +1,8 @@ +import java.io.BufferedReader; +import java.io.FileReader; +import java.io.FileWriter; +import java.io.IOException; +import java.io.PrintWriter; import java.util.List; public class ReportGenerator { @@ -17,67 +22,69 @@ public class ReportGenerator { 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 { + BufferedReader reader = new BufferedReader(new FileReader(ordersFilePath)); + String line; + + while ((line = reader.readLine()) != null) { + try { + String[] parts = line.split(","); + int productId = Integer.parseInt(parts[0]); + int quantity = Integer.parseInt(parts[1]); + int discountPercent = Integer.parseInt(parts[2]); + + if (quantity <= 0 || discountPercent < 0 || discountPercent > 99) { + totalInvalidLines++; + continue; + } + + Product foundProduct = null; + for (Product p : productList) { + if (p.getProductID() == productId) { + foundProduct = p; + break; + } + } + + if (foundProduct == null) { + totalInvalidLines++; + continue; + } + + double subtotal = quantity * foundProduct.getPrice(); + double discountValue = subtotal * discountPercent / 100.0; + double finalCost = subtotal - discountValue; + + totalQuantity += quantity; + totalFinalCost += finalCost; + totalDiscountValue += discountValue; + + } catch (NumberFormatException e) { + totalInvalidLines++; + } + } + + reader.close(); + } catch (IOException e) { + System.err.println("Error reading order file: " + e.getMessage()); + } } 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 + try { + PrintWriter writer = new PrintWriter(new FileWriter("report.txt")); - /* Example Structure - ========= SALES REPORT ========= - Total Quantity Sold: 42 - Total Final Cost: $1520.75 - Total Discount Value: $230.50 - Invalid Rows: 3 - ================================ - */ + writer.println("========= SALES REPORT ========="); + writer.println("Total Quantity Sold: " + totalQuantity); + writer.printf("Total Final Cost: $%.2f%n", totalFinalCost); + writer.printf("Total Discount Value: $%.2f%n", totalDiscountValue); + writer.println("Invalid Rows: " + totalInvalidLines); + writer.println("================================"); + + writer.close(); + } catch (IOException e) { + System.err.println("Error writing report: " + e.getMessage()); + } } } \ No newline at end of file