Question

I’m using a 2D Array in Java and it’s the first time doing so. I’m wondering what is wrong with the array as I’m getting many errors…? (probably a really stupid error)

Code

    int board[21][21] = {{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, 
  {1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1},
  {1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1},
  {1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1},
  {1,0,1,0,0,1,0,1,0,0,0,0,0,1,0,1,0,0,1,0,1},
  {1,0,1,1,1,1,0,1,1,1,0,1,1,1,0,1,1,1,1,0,1},
  {1,0,0,0,0,1,0,0,0,1,0,1,0,0,0,1,0,0,0,0,1},
  {1,1,1,1,0,1,0,1,1,1,1,1,1,1,0,1,0,1,1,1,1},
  {0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0},
  {1,1,1,1,1,1,1,1,0,1,1,1,0,1,1,1,1,1,1,1,1},
  {0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0},
  {1,1,1,1,0,1,0,1,1,1,1,1,1,1,0,1,0,1,1,1,1},
  {1,0,0,0,0,1,0,1,0,0,0,0,0,1,0,1,0,0,0,0,1},
  {1,0,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,0,1},
  {1,0,1,0,0,1,0,0,0,1,0,1,0,0,0,1,0,0,1,0,1},
  {1,0,1,1,0,1,1,1,1,1,1,1,1,1,1,1,0,1,1,0,1},
  {1,0,0,1,0,1,0,1,0,0,0,0,0,1,0,1,0,1,0,0,1},
  {1,0,1,1,1,1,0,1,1,1,0,1,1,1,0,1,1,1,1,0,1},
  {1,0,1,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,1,0,1},
  {1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1},
  {1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1}};

Error List
Here is a link instead of posting it here since it’s a lot of errors

Answer 1

You can’t specify the size of arrays in the declaration. If you remove your size integers, it will compile. However, you should always place your brackets on your variable’s type, not on the variable itself when you declare it as such:

int[][] board;

rather than:

int board[][];

If you want to create a blank array with a specific size, then you would do so with the new operator:

int[][] board = new int[21][21];

However, you never specify a size if you define your array though array initialization i.e.

int[][] board = {{...}, ...};