How to print a list in a 3 by 3 array in Java?-CodePudding

If I wanted this list

List<Character> Board = Arrays.asList('1', '2', '3', '4', '5', '6', '7', '8', '9');

to be printed as

How exactly would I do that? Any help would be nice.

CodePudding user response：

You can do it as:

for (int i = 0; i < 3; i  ) {
    for (int j = 0; j < 3; j  ) {
        System.out.print(Board.get(i * 3   j)   " ");
    }
    System.out.println();
}

CodePudding user response：

Assuming exactly 3 x 3 size:

for (i=0; i<9; i =3) {
    for (j=i; j<i 3; j  ) {
        System.out.printf(" %c", Board.get(j));
    }
    System.out.println();
}

Generalizing to work for any N x M is left as an exercise for the reader.

CodePudding user response：

You want a dynamic separator. The first character is special, in that you want no separator. Otherwise, default to a space. Every third character change it to two newlines. Also, Java naming convention would be board (not Board). Something like,

String sep = "";
for (int i = 0; i < board.size(); i  ) {
    System.out.printf("%s%c", sep, board.get(i));
    sep = (i   1) % 3 == 0 ? "\n\n" : " ";
}

Outputs (as requested)