Implemented winCheck method

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

@@ -8,7 +8,7 @@ public class GameBoard {
 
 
 
-    void gameBoard(){
+    public void gameBoard(){
 
     }
 
@@ -40,10 +40,30 @@ public class GameBoard {
      * @return Winner or tie or unfinished
      */
     public int winCheck(){
+        // game isn't finished
+        for (int i = 0; i < 9; i++) {
+            int x = i % 3 + 1;
+            int y = i / 3;
+            if (board[y][x] == 0)
+                return 0;
+        }
 
+        for (int i = 0; i < 3; i++){
+            // vertical
+            if (board[0][i] == board[1][i] && board[1][i] == board[2][i])
+                return board[0][i];
+            // horizontal
+            if (board[i][0] == board[i][1] && board[i][1] == board[i][2])
+                return board[i][0];
+        }
+        // diagonal
+        if (board[0][0] == board[1][1] && board[1][1] == board[2][2])
+            return board[1][1];
+        if (board[2][0] == board[1][1] && board[1][1] == board[0][2])
+            return board[1][1];
 
-
-        return 0;
+        // Tie
+        return 3;
     }
 
     /**