java - Check if index is OutOfBounds in a 2D array -

so i'm building sort of "game of life" application in java , having trouble detecting when index out of bounds.the code below modified version qustion here so.

2d array:

1,1,1,1 1,1,1,1 1,1,1,1 1,1,1,1 

code

private void traverse() {                (int = 0; < brickarray.length; i++) {             (int j = 0; j < brickarray[i].length; j++) {                  system.out.println(i - 1 + "," + j);                 checkifallowed(i - 1, j);              }         }        }      public void checkifallowed(int row, int column) {     boolean incorrect = check(row) && check(column);     if (incorrect) {         system.out.println("wall");     } else {         system.out.println("road");      } }  private boolean check(int index) {     return (index < 0 || index > board.getheight()); } 

result:

traversing:

-1,0 road -1,1 road -1,2 road -1,3 road 0,0 road 0,1 road 0,2 road 0,3 road 1,0 road 1,1 road 1,2 road 1,3 road 2,0 road 2,1 road 2,2 road 2,3 road 

in example, 4 top cells should have printed "wall", didn't.

the pitfall of negative names, , neutral names (check).

boolean incorrect = check(row) || check(column); 

when either row or column incorrect, whole coordinates incorrect.

i write check out here, board must square using getheight in check.