For

We iterate multidimensional arrays with nested for loops.

char[][] board = new char[3][3];
for(int row=0; row < board.length; row++) {
  for(int col=0; col < board[row].length; col++) {
    System.out.print(board[row][col]);
  }
  System.out.println();
}

The outer for loop iterates the rows.

The inner for loop iterates the columns (for each row).

Practice Exercise

Multidimensional arrays do not have to be rectangular. Each array could be a different length.

In fact, we are only required to give the dimension of the first index when creating the array.

int[][] ints = new int[4][];

ints[0] = new int[3];
ints[3] = new int[4];

Drill

AdvancedArrays/com.example.advancedarrays.drills.MultiDeclare * Add a method called printBoard to iterate through the tic-tac-toe board. Its one parameter is a 2-d array of chars, same as your tic-tac-toe board. * Call the method in main to print your board.

(Solution: MultiDeclare2.java)

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