comefrom: <awangdev>200. Number of Islands_4.java
code: private boolean validate(char[][] grid, int x, int y) {
  
          return x < 0 || x >= grid.length || y < 0 || y >= grid[0].length || grid[x][y] == '0';
      }
masked: private boolean var_0 ( char [ ] [ ] var_1 , int var_2 , int var_3 ) {
    return var_2 < 0 || var_2 >= var_1 . length || var_3 < 0 || var_3 >= var_1 [ 0 ] . length || var_1 [ var_2 ] [ var_3 ] == '0' ;
  }
  