Printing string in rows and column pattern Java

Question

i\'m just created a java project to print string that is given in rows and column just like matrix. Here\'s the output that i just made:

h e l l o 
_ w o r l 
d _         


        

Answer 1

spiralMatrix(int s) returns s x s spiral matrix.

static int[][] spiralMatrix(int s) {
    int[][] a = new int[s][s];
    int n = 0;
    for (int b = s - 1, c = 0, x = 0, y = 0, dx = 0, dy = 1; b > 0; b -= 2, x = y = ++c)
        for (int j = 0, t = 0; j < 4; ++j, t = dx, dx = dy, dy = -t)
            for (int i = 0; i < b; ++i, x += dx, y += dy, ++n)
                a[x][y] = n;
    if (s % 2 == 1)
        a[s / 2][s / 2] = n;
    return a;
}

test

for (int s = 0; s < 6; ++s) {
    int[][] a = spiralMatrix(s);
    System.out.println("s=" + s);
    for (int[] row : a)
        System.out.println(Arrays.toString(row));
    System.out.println();
}

result

s=0

s=1
[0]

s=2
[0, 1]
[3, 2]

s=3
[0, 1, 2]
[7, 8, 3]
[6, 5, 4]

s=4
[0, 1, 2, 3]
[11, 12, 13, 4]
[10, 15, 14, 5]
[9, 8, 7, 6]

s=5
[0, 1, 2, 3, 4]
[15, 16, 17, 18, 5]
[14, 23, 24, 19, 6]
[13, 22, 21, 20, 7]
[12, 11, 10, 9, 8]

And you can do it with this method.

String str = "hello world its beautiful";
int[][] spiral = spiralMatrix(5);
int length = str.length();
for (int x = 0, h = spiral.length, w = spiral[0].length; x < h; ++x) {
    for (int y = 0; y < w; ++y) {
        int p = spiral[x][y];
        System.out.print((p < length ? str.charAt(p) : " ") + " " );
    }
    System.out.println();
}

result

h e l l o 
  b e a   
s u l u w 
t f i t o 
i   d l r