The Arrays.fill() method causes an exception

Question

Right now I am having trouble filling an array with spaces. Whenever I use the array fill method I keep getting an exception. Right now I excluded the rest of the code and only included the ones that causes problems. Here it is. Note I am a beginner to java so don't get angry if this is too simple of a question. I have searched here and could not find anything.

public class board 
{       
    public static void main(String args[])
    {
        char board [][] = new char  [6][7]; 
        int column=0; 
        int row=0;

        java.util.Arrays.fill(board,' ');
    }
}

The exception says

Exception in thread "main" java.lang.ArrayStoreException:
java.lang.Character
at java.util.Arrays.fill(Arrays.java:2710)
at java.util.Arrays.fill(Arrays.java:2685)
at board.main(board.java:26)

Answer 1

Arrays.fill expects a single-dimensional array, you're passing in a jagged array.

Instead, do this:

for(int x=0;x<board.length;x++)
    for(int y=0;y<board[x].length;y++)
        board[x][y] = ' ';

or this:

for(int x=0;x<board.length;x++)
    Arrays.fill( board[x], ' ' );