refactoring: created Board class for better object orientation and extracted functionality from Tictactoe to board with tests

src/main/java/Game/TicTacToe/Board.java

@@ -0,0 +1,66 @@
+package Game.TicTacToe;
+
+import java.util.ArrayList;
+
+public class Board {
+
+    enum State {
+        CIRCLE,
+        CROSS,
+        EMPTY
+    }
+    private State[] states;
+
+
+    public Board() {
+        states = new State[9];
+        for (int i = 0; i < states.length; i++) {
+            states[i] = State.EMPTY;
+        }
+    }
+
+
+
+    public static char getStatedChar(State state) {
+        switch (state) {
+            case CIRCLE:
+                return 'O';
+            case CROSS:
+                return 'X';
+            case EMPTY:
+                return ' ';
+            default:
+                return '-';
+        }
+    }
+
+    /*
+    1    ║2    ║3
+      o  ║  x  ║  o
+    ═════╬═════╬═════
+    4    ║5    ║6
+      o  ║  x  ║  o
+    ═════╬═════╬═════
+    7    ║8    ║9
+      o  ║  x  ║  o
+ */
+    public ArrayList<String> getOutputBoard() {
+        ArrayList<String> outputBoard = new ArrayList<>();
+        outputBoard.add("1    ║2    ║3");
+        outputBoard.add("  " + getStatedChar(states[0]) + "  ║  " + getStatedChar(states[1]) + "  ║  " + getStatedChar(states[2]) +"  ");
+        outputBoard.add("═════╬═════╬═════");
+
+        outputBoard.add("4    ║5    ║6");
+        outputBoard.add("  " + getStatedChar(states[3]) + "  ║  " + getStatedChar(states[4]) + "  ║  " + getStatedChar(states[5]) +"  ");
+        outputBoard.add("═════╬═════╬═════");
+
+        outputBoard.add("7    ║8    ║9");
+        outputBoard.add("  " + getStatedChar(states[6]) + "  ║  " + getStatedChar(states[7]) + "  ║  " + getStatedChar(states[8]) +"  ");
+
+        return outputBoard;
+    }
+    
+    public State[] getStates() {
+        return this.states;
+    }
+}

src/main/java/Game/Tictactoe.java

@@ -1,75 +1,25 @@
 package Game;
 
-import java.util.ArrayList;
+import Game.TicTacToe.Board;
 
 public class Tictactoe extends Game {
 
-    enum State {
-        CIRCLE,
-        CROSS,
-        EMPTY
-    }
     private String input;
-    private State[] currentBoard;
+    private Board currentBoard;
+    private boolean crossTurn;
 
     public Tictactoe() {
         init();
     }
 
     private void init() {
+        crossTurn = true;
         currentBoard = new Board();
     }
 
     @Override
-    public void update(String string) {
-        writeBoard(currentBoard);
-    }
-
-    public char getStatedChar(State state) {
-        switch (state) {
-            case CIRCLE:
-                return 'O';
-            case CROSS:
-                return 'X';
-            case EMPTY:
-                return ' ';
-            default:
-                return '-';
-        }
+    public void update(String input) {
+        outputBuffer.addAll(currentBoard.getOutputBoard());
     }
 
-    private State[] newBoard() {
-        State[] board = new State[9];
-        for (int i = 0; i < board.length; i++) {
-            board[i] = State.EMPTY;
-        }
-        return board;
-    }
-
-    public State[] getCurrentBoard() {
-        return currentBoard;
-    }
- /*
-    1    ║2    ║3
-      o  ║  x  ║  o
-    ═════╬═════╬═════
-    4    ║5    ║6
-      o  ║  x  ║  o
-    ═════╬═════╬═════
-    7    ║8    ║9
-      o  ║  x  ║  o
- */
-    private void writeBoard(State[] state) {
-        this.outputBuffer.clear();
-        outputBuffer.add("1    ║2    ║3");
-        outputBuffer.add("  " + getStatedChar(state[0]) + "  ║  " + getStatedChar(state[1]) + "  ║  " + getStatedChar(state[2]) +"  ");
-        outputBuffer.add("═════╬═════╬═════");
-
-        outputBuffer.add("4    ║5    ║6");
-        outputBuffer.add("  " + getStatedChar(state[3]) + "  ║  " + getStatedChar(state[4]) + "  ║  " + getStatedChar(state[5]) +"  ");
-        outputBuffer.add("═════╬═════╬═════");
-
-        outputBuffer.add("7    ║8    ║9");
-        outputBuffer.add("  " + getStatedChar(state[6]) + "  ║  " + getStatedChar(state[7]) + "  ║  " + getStatedChar(state[8]) +"  ");
-    }
 }

src/test/java/Game/TicTacToe/BoardTest.java

@@ -0,0 +1,39 @@
+package Game.TicTacToe;
+
+import Game.Tictactoe;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class BoardTest {
+
+    Board board;
+
+    @BeforeEach
+    void setUp() {
+        board = new Board();
+    }
+
+    @AfterEach
+    void tearDown() {
+    }
+
+    @Test
+    void getStatedChar() {
+        assertEquals(Board.getStatedChar(Board.State.CIRCLE), 'O');
+        assertEquals(Board.getStatedChar(Board.State.CROSS), 'X');
+        assertEquals(Board.getStatedChar(Board.State.EMPTY), ' ');
+    }
+
+    @Test
+    void testForEmptyBoardOnInitialization() {
+        for (int i = 0; i < 9; i++) {
+            assertEquals(board.getStates()[i], Board.State.EMPTY);
+        }
+    }
+
+
+
+}

src/test/java/Game/TictactoeTest.java

@@ -24,18 +24,4 @@ class TictactoeTest {
 
     }
 
-    @Test
-    void getStatedChar() {
-        assertEquals(ttt.getStatedChar(Tictactoe.State.CIRCLE), 'O');
-        assertEquals(ttt.getStatedChar(Tictactoe.State.CROSS), 'X');
-        assertEquals(ttt.getStatedChar(Tictactoe.State.EMPTY), ' ');
-    }
-
-    @Test
-    void testForEmptyBoardOnInitialization() {
-        Tictactoe.State[] board = ttt.getCurrentBoard();
-        for (int i = 0; i < board.length; i++) {
-            assertEquals(board[i], Tictactoe.State.EMPTY);
-        }
-    }
 }