import java.io.*;
import java.util.*;
import javax.swing.*;
public class SudokuTest1 {

    public static void main(String[] arg) throws FileNotFoundException {
    JFileChooser dialog = new JFileChooser(System.getProperty("user.dir"));
    while (true) {
    SudokuModel mod = new MySudokuModel();
    String filename = null;
    File f = null;
    if (dialog.showOpenDialog(null) == JFileChooser.APPROVE_OPTION)
        f = dialog.getSelectedFile();
    else        System.exit(0);
    Scanner sc = new Scanner(f);
    String input = "";
    while (sc.hasNextLine())
        input += sc.nextLine() + '\n';
    System.out.println(f.getName() + ": " +  "\n" + input);
    try {        mod.setBoard(input);
    if (!mod.isUnique()) {
        System.out.println("Illegal Sudoku puzzle. Multiple solutions");        }
    else {
        mod.solve();
        System.out.println(f.getName() + " Solution: ");
        int[][] m = mod.getBoard();
        for (int i=0; i<9; i++) {
            for (int j=0; j<9; j++) {
                int v = mod.getSquare(i,j);
                if (v != m[i][j])
                    System.out.println("Error. Methods getBoard and getSquare return different values");
     if (v != 0)
         System.out.print(v);
     else
         System.out.print('.');            }
            System.out.println();          }
        }
    }            catch (IllegalArgumentException e) {
        System.out.println("Illegal Sudoku puzzle. " + e.getMessage());      }
    System.out.println("========================================================");     }
    }
    }