oneTwoTripTask.java

/**
 * Created by ermolnik on 29.04.2018 15:38:12
 */
public class Main {

    //matrix size
    private static int size = 5;

    //matrix initialization
    private static int[][] n = new int[size][size];

    //coordinates of matrix center
    private static int dx = size / 2;
    private static int dy = size / 2;


    public static void main(String[] args) {
        fillArray();
        start();
    }

    //method for display matrix values by spiral
    private static void start() {
        System.out.println("");
        System.out.print(n[dx][dy] + " ");
        int i = 0;
        while (!(dx == 0 && dy == 0)) {
            i++;
            left(i);
            down(i);
            i++;
            right(i);
            up(i);
        }
    }

    //methods for move to some direction if it is possible
    private static void left(int repeat) {
        for (int i = 0; i < repeat; i++) {
            if (dy > 0) {
                dy--;
                System.out.print(n[dx][dy] + " ");
            }
        }

    }

    private static void right(int repeat) {
        for (int i = 0; i < repeat; i++) {
            if (dy < size - 1 && !(dx == 0 && dy == 0)) {
                dy++;
                System.out.print(n[dx][dy] + " ");
            }
        }
    }

    private static void down(int repeat) {
        for (int i = 0; i < repeat; i++) {
            if (dx < size - 1 && !(dx == 0 && dy == 0)) {
                dx++;
                System.out.print(n[dx][dy] + " ");
            }
        }
    }

    private static void up(int repeat) {
        for (int i = 0; i < repeat; i++) {
            if (dx > 0 && dy != 0) {
                dx--;
                System.out.print(n[dx][dy] + " ");
            }
        }
    }


    //fill array with some values
    private static void fillArray() {
        int number = 0;
        for (int i = 0; i < size; i++) {
            for (int j = 0; j < size; j++) {
                number++;
                n[i][j] = number;
                if (n[i][j] > 10) {
                    System.out.print(n[i][j] + " ");
                } else System.out.print(n[i][j] + "  ");
            }
            System.out.println("");
        }
    }
}