feat: add Main.java

src/main/java/Main.java

@@ -0,0 +1,38 @@
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class Main {
+    static ArrayList<Product> productCatalog = new ArrayList<>();
+    public static void loadProducts() throws IOException {
+        InputStream input = Main.class
+                .getClassLoader()
+                .getResourceAsStream("products.csv");
+        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.
+    }
+
+    public static void main(String[] args)
+    {
+        try {
+            loadProducts();
+        } catch (IOException e) {
+            System.err.println("Something went wrong with loading products!\nterminating the program...");
+            return;
+        }
+
+        ReportGenerator reportGenerator = new ReportGenerator("2025_order_details.csv", productCatalog);
+        reportGenerator.processFile();
+        reportGenerator.saveReport();
+    }
+}