if(grid[row][col] != null){
               throw new IllegalMoveException();
           }

its seeing if the index of the 2d-array is null or not i really dont get it please help!!!! Thanks

CodePudding user response：

Because your grid variable's type is an array of primitives (char[][]), and primitives cannot be null. null is short for 'null pointer' - it is not identical to 0, nor is it identical to the NULL character (which is '\0', or just 0 casting to a char).