public void printGrid() {
	  for(int i = 0; i < width + 2; i++)
		  System.out.print("_");
	  System.out.println();
	  for(int y = 0; y < height; y++) {
		  System.out.print("|");
		  for(int x = 0; x < width; x++) {
			  if(grid[x][y] instanceof EmptyTile) 
				  System.out.print(" ");
			  else if(grid[x][y] instanceof FishTile)
				  System.out.print("~");
			  else
				  System.out.print("S"); //System.out.print(sharkFeeding(x, y));
		  }
		  System.out.println("|");
	  }
	  for(int i = 0; i < width + 2; i++)
		  System.out.print("_");
	  System.out.println();
  }