Change it to: if(position[i][j] == 0)
Each char can be compared with an int.
The default value is '\u0000'
i.e. 0
for a char array element.
And that's exactly what you meant by empty cell
, I assume.
To test this you can run this.
class Test {
public static void main(String[] args) {
char[][] x = new char[3][3];
for (int i=0; i<3; i++){
for (int j=0; j<3; j++){
if (x[i][j] == 0){
System.out.println("This char is zero.");
}
}
}
}
}