- So, if you try to enter a 7 when there is already a 7 in the same row, column, or 3x3 grid, it should give an error message instead
- You can use a
JOptionPane.showMessageDialog - This should use the Sudoku model class to check for this. Probably you should add a new method!
- Choosing this menu option should highlight any squares that can only contain one possible value
- If you have won it should let you know and end the game!
- Figure out some way to show only the legal values for a square. This can be a special keyboard
input (like if you click on an empty square and then click 'h' it will show you the legal
values somehow, either through a
JOptionPane.showMessageDialogor even something like aListSelectionModel)
- Set up the load/save menu options so that they can load and save a game
- To save a game, write the board to a text file. Use a
JFileChooserto decide what file to write to - To load a game, use a
JFileChooserto load a game from a text file