tictactoe: added methods to reset internal board and gui after game over

src/main/java/de/tims/tictactoe/GameLogic.java

@@ -114,6 +114,13 @@ public class GameLogic implements ActionListener {
 		this.currentPlayer = this.currentPlayer == PLAYER_1 ? PLAYER_2 : PLAYER_1;
 	}
 
+	public void resetBoard() {
+		for (int i = 0; i < this.board.length; i++) {
+			for (int j = 0; j < this.board.length; j++) {
+				this.board[i][j] = '-';
+			}
+		}
+	}
 
 	public JPanel generateGUI() {
 		this.fields = new JButton[this.board.length][this.board.length];
@@ -142,7 +149,18 @@ public class GameLogic implements ActionListener {
 				}
 			}
 			JOptionPane.showMessageDialog(contentPanel, "Spieler " + this.currentPlayer  + " hat gewonnen.");
-			System.exit(0);
+			this.resetGUI();
+		}
+		this.switchPlayer();
+	}
+
+	private void resetGUI() {
+		for (int i = 0; i < this.fields.length; i++) {
+			for (int j = 0; j < this.fields.length; j++) {
+				this.resetBoard();
+				this.fields[i][j].setText("");
+				this.fields[i][j].setEnabled(true);
+			}
 		}
 		this.switchPlayer();
 	}

src/test/java/de/tims/tictactoe/GameLogicTest.java

@@ -101,6 +101,20 @@ class GameLogicTest {
 		assertEquals(expectedResult, realResult);
 	}
 	
+	@Test
+	void resetBoardTest() {
+		GameLogic game = new GameLogic(SIZE);
+		game.setField(1, 2, 'x');
+		
+		char[][] expectedResult = new char[][]{{'-', '-', '-'}, 
+											   {'-', '-', '-'},
+											   {'-', '-', '-'}};;
+		game.resetBoard();
+		char[][] realResult = game.getBoard();
+
+		assertArrayEquals(expectedResult, realResult);
+	}
+	
 	 @ParameterizedTest(name = "[{index}] {0} -> {2} fields")
 	 @MethodSource("testCasesForCountPlayfields")
 	 void fieldCountTest(String testName, int size, int expectedResult) {