java/w7/refactor.diff

diff --git "a/.\\MainSevenBefore.java" "b/.\\MainSeven.java"
index 5b72238..f8be922 100644
--- "a/.\\MainSevenBefore.java"
+++ "b/.\\MainSeven.java"
@@ -1,16 +1,43 @@
 import java.io.BufferedReader;
+import java.io.FileNotFoundException;
 import java.io.FileReader;
 import java.io.IOException;
 
-public class MainSevenBefore {
-    public static void main(String[] args) throws IOException {
-        BufferedReader br = new BufferedReader(new FileReader("scores.txt"));
-        int sum = 0;
-        String line;
-        while ((line = br.readLine()) != null) {
-            sum += Integer.parseInt(line);
+public class MainSeven {
+
+    private static int parseLine(String line) throws InvalidInputException {
+        String trimmed = line.trim();
+        if (trimmed.isEmpty()) {
+            throw new InvalidInputException();
+        }
+
+        try {
+            return Integer.parseInt(trimmed);
+        } catch (NumberFormatException e) {
+            throw new InvalidInputException(trimmed, e);
+        }
+    }
+
+    public static void main(String[] args) {
+        try (FileReader fr = new FileReader("scores.txt")) {
+            BufferedReader br = new BufferedReader(fr);
+
+            int sum = 0;
+            String line;
+            while ((line = br.readLine()) != null) {
+                try {
+                    sum += parseLine(line);
+                } catch (InvalidInputException e) {
+                    System.out.println(e.getMessage());
+                }
+            }
+
+            br.close();
+            System.out.println(sum);
+        } catch (FileNotFoundException e) {
+            System.out.println("File not found: " + e.getMessage());
+        } catch (IOException e) {
+            System.out.println("IOException: " + e.getMessage());
         }
-        br.close();
-        System.out.println(sum);
     }
 }