4gewinnt: refactored setter and getter

src/main/java/de/tims/viergewinnt/ai/Logic.java

@@ -23,11 +23,11 @@ public class Logic {
     }
 
     public void setField(int player, int row, int column) {
-		board[row][column] = player;
+		this.board[row][column] = player;
 	}
 	
 	public int getField(int row, int column) {
-		return board[row][column];
+		return this.board[row][column];
 	}
 	
 	public int getBoardSize() {
@@ -35,27 +35,27 @@ public class Logic {
 	}
 	
 	public void setCurrentPlayer(int player) {
-		currentPlayer = player;
+		this.currentPlayer = player;
 	}
 	
 	public int getCurrentPlayer() {
-		return currentPlayer;
+		return this.currentPlayer;
 	}
 	
 	public void setPlayer1Score(int score) {
-		player1Score = score;
+		this.player1Score = score;
 	}
 	
 	public int getPlayer1Score() {
-		return player1Score;
+		return this.player1Score;
 	}
 	
 	public void setPlayer2Score(int score) {
-		player2Score = score;
+		this.player2Score = score;
 	}
 	
 	public int getPlayer2Score() {
-		return player2Score;
+		return this.player2Score;
 	}
 	
 	public int playChip(int column) {