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private final static int[][] next = {
   {
   0, -1}, {
   0, 1}, {
   -1, 0}, {
   1, 0}};private int rows;private int cols;    char[][] matrix = buildMatrix(array);private char[][] buildMatrix(char[] array) {
       char[][] matrix = new char[rows][cols];    for (int r = 0, idx = 0; r < rows; r++)        for (int c = 0; c < cols; c++)            matrix[r][c] = array[idx++];    return matrix;}

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