Python [Java]

import java.util.Scanner;

public class Python {
    private static int rowOfThePlayer;
    private static int columnOfThePlayer;
    private static String theEnemy = "";

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int dimensions = Integer.parseInt(scanner.nextLine());

        String[] commands = scanner.nextLine().split(", ");

        char[][] theMatrix = new char[dimensions][dimensions];

        for (int i = 0; i < dimensions; i++) {
            String currentLine = scanner.nextLine().replaceAll("\\s+", "");

            if (currentLine.contains("s")) {
                rowOfThePlayer = i;
                columnOfThePlayer = currentLine.indexOf("s");
            }

            theMatrix[i] = currentLine.toCharArray();
        }

        int finalFoodCounter = 0;
        int pythonLength = countTheFoodQuantity(theMatrix) + 1;

        for (String currentCommand : commands) {
            switch (currentCommand) {
                case "up":
                    moveUp(theMatrix);
                    break;
                case "down":
                    moveDown(theMatrix);
                    break;
                case "left":
                    moveLeft(theMatrix);
                    break;
                case "right":
                    moveRight(theMatrix);
                    break;
            }

            if ("e".equals(theEnemy)) {
                System.out.println("You lose! Killed by an enemy!");
                return;
            }

            finalFoodCounter = countTheFoodQuantity(theMatrix);

            if (finalFoodCounter == 0) {
                System.out.printf("You win! Final python length is %d%n", pythonLength);
                return;
            }
        }

        System.out.printf("You lose! There is still %d food to be eaten.%n", finalFoodCounter);
    }

    private static void moveUp(char[][] theMatrix) {
        int previousRow = rowOfThePlayer;

        if (rowOfThePlayer - 1 < 0) {
            rowOfThePlayer = theMatrix.length;
        }

        if (theMatrix[rowOfThePlayer - 1][columnOfThePlayer] != 'e') {
            if (rowOfThePlayer == theMatrix.length) {
                previousRow = 0;
            }

            theMatrix[previousRow][columnOfThePlayer] = '*';
            rowOfThePlayer--;

            theMatrix[rowOfThePlayer][columnOfThePlayer] = 's';
        } else {
            theEnemy = "e";
        }
    }

    private static void moveDown(char[][] theMatrix) {
        int previousRow = rowOfThePlayer;

        if (rowOfThePlayer + 1 == theMatrix.length) {
            rowOfThePlayer = -1;
        }

        if (theMatrix[rowOfThePlayer + 1][columnOfThePlayer] != 'e') {
            if (rowOfThePlayer == -1) {
                previousRow = theMatrix.length - 1;
            }

            theMatrix[previousRow][columnOfThePlayer] = '*';
            rowOfThePlayer++;

            theMatrix[rowOfThePlayer][columnOfThePlayer] = 's';
        } else {
            theEnemy = "e";
        }
    }

    private static void moveLeft(char[][] theMatrix) {
        int previousColumn = columnOfThePlayer;

        if (columnOfThePlayer - 1 < 0) {
            columnOfThePlayer = theMatrix.length;
        }

        if (theMatrix[rowOfThePlayer][columnOfThePlayer - 1] != 'e') {
            if (columnOfThePlayer == theMatrix.length) {
                previousColumn = 0;
            }

            theMatrix[rowOfThePlayer][previousColumn] = '*';
            columnOfThePlayer--;

            theMatrix[rowOfThePlayer][columnOfThePlayer] = 's';
        } else {
            theEnemy = "e";
        }
    }

    private static void moveRight(char[][] theMatrix) {
        int previousColumn = columnOfThePlayer;

        if (columnOfThePlayer + 1 == theMatrix.length) {
            columnOfThePlayer = -1;
        }

        if (theMatrix[rowOfThePlayer][columnOfThePlayer + 1] != 'e') {
            if (columnOfThePlayer == -1) {
                previousColumn = theMatrix.length - 1;
            }

            theMatrix[rowOfThePlayer][previousColumn] = '*';
            columnOfThePlayer++;

            theMatrix[rowOfThePlayer][columnOfThePlayer] = 's';
        } else {
            theEnemy = "e";
        }
    }

    private static int countTheFoodQuantity(char[][] matrix) {
        int counter = 0;

        for (char[] rowsAndColumns : matrix) {
            for (char character : rowsAndColumns) {
                if (character == 'f') {
                    counter++;
                }
            }
        }

        return counter;
    }
}