tictactoe: refactored generateGUI method

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

@@ -12,6 +12,9 @@ public class GameLogic {
 	private static final char PLAYER_2 = 'o';
 	private char[][] board;
 	private final char[] occupiedFields = { PLAYER_1, PLAYER_2 };
+	
+	private JButton[] fields;
+	private JPanel contentPanel;
 
 	public GameLogic(int size) {
 		if (size < 3) {
@@ -101,15 +104,15 @@ public class GameLogic {
 	}
 
 	public JPanel generateGUI() {
-		JButton[] fields = new JButton[(int) Math.pow(this.board.length, 2)];
-		JPanel contentPanel = new JPanel();
-		contentPanel.setLayout(new GridLayout(this.board.length, this.board.length));
+		this.fields = new JButton[(int) Math.pow(this.board.length, 2)];
+		this.contentPanel = new JPanel();
+		this.contentPanel.setLayout(new GridLayout(this.board.length, this.board.length));
 		
-		for (int i = 0; i < fields.length; i++) {
-			fields[i] = new JButton();
-			contentPanel.add(fields[i]);
+		for (int i = 0; i < this.fields.length; i++) {
+			this.fields[i] = new JButton();
+			this.contentPanel.add(this.fields[i]);
 		}
-		return contentPanel;
+		return this.contentPanel;
 	}
 
 }