Just another update

Task/Longest-string-challenge/Java/longest-string-challenge.java

@@ -0,0 +1,28 @@
+import java.io.File;
+import java.util.Scanner;
+
+public class LongestStringChallenge {
+
+    public static void main(String[] args) throws Exception {
+        String lines = "", longest = "";
+        try (Scanner sc = new Scanner(new File("lines.txt"))) {
+            while(sc.hasNext()) {
+                String line = sc.nextLine();
+                if (longer(longest, line))
+                    lines = longest = line;
+                else if (!longer(line, longest))
+                    lines = lines.concat("\n").concat(line);
+            }
+        }
+        System.out.println(lines);
+    }
+
+    static boolean longer(String a, String b) {
+        try {
+            String dummy = a.substring(b.length());
+        } catch (StringIndexOutOfBoundsException e) {
+            return true;
+        }
+        return false;
+    }
+}