Added a tie detection to the checkWin method + javadoc

src/main/java/com/example/tictactoeswtha2/Controller.java

@@ -56,7 +56,9 @@ public class Controller {
         checkWin();
     }
 
-
+    /**
+     * Checks if the game is won or tied
+     */
     private void checkWin() {
         if ((turnSign == 'X') && (
                 (l00.getText().length() > 0 && l01.getText().length() > 0 && l02.getText().length() > 0 && l00.getText().charAt(0) == l01.getText().charAt(0) && l01.getText().charAt(0) == l02.getText().charAt(0)) ||
@@ -78,6 +80,11 @@ public class Controller {
                 (l00.getText().length() > 0 && l11.getText().length() > 0 && l22.getText().length() > 0 && l00.getText().charAt(0) == l11.getText().charAt(0) && l11.getText().charAt(0) == l22.getText().charAt(0)) ||
                 (l20.getText().length() > 0 && l11.getText().length() > 0 && l02.getText().length() > 0 && l02.getText().charAt(0) == l11.getText().charAt(0) && l11.getText().charAt(0) == l20.getText().charAt(0))))
             turnLabel.setText("X won");
+
+        if (l00.getText().length() > 0 && l01.getText().length() > 0 && l02.getText().length() > 0 &&
+                l10.getText().length() > 0 && l11.getText().length() > 0 && l12.getText().length() > 0 &&
+                l20.getText().length() > 0 && l21.getText().length() > 0 && l22.getText().length() > 0)
+            turnLabel.setText("Tie");
     }