--------- Domain Class -------- public class Sudoku { public String[][] makeSudoku(String s) { int SIZE = 9; int k = 0; String[][] x = new String[SIZE][SIZE]; for (int i = 0; i < SIZE; i++) { for (int j = 0; j < SIZE; j++) { x[i][j] = s.substring(k, k + 1); k++; } } return x; } public String getPrintableSudoku(String[][] x) { int SIZE = 9; String temp = ""; for (int i = 0; i < SIZE; i++) { if ((i == 3) || (i == 6)) { temp = temp + "================= "; } for (int j = 0; j < SIZE; j++) { if ((j == 3) || (j == 6)) { temp = temp + " || "; } temp = temp + x[i][j]; } temp = temp + " "; } return temp; } public boolean isValidSudoku(String[][] x) { return rowsAreLatin(x) && colsAreLatin(x) && goodSubsquares(x); } public boolean rowsAreLatin(String[][] x) { boolean test = true; for (int i = 0; i < x.length; i++) { test = test && rowIsLatin(x,i); } return test; } public boolean rowIsLatin(String[][] x, int i) { // fill in your code here return true; } public boolean colsAreLatin(String[][] x) { // fill in your code here return true; } public boolean colIsLatin(String[][] x, int j) { // fill in your code here return true; } public boolean goodSubsquares(String[][] x) { // fill in your code here return true; } public boolean goodSubsquare(String[][] x, int i, int j) { // fill in your code here return true; } } ----------- Driver Class -------------- public class SudokuSimulation { public static void main(String[] args) { Sudoku mySudokuPuzzle = new Sudoku(); // Row and subsquares are invalid String config0 = "9234567892345678913456789124567891235678912346" + "78912345789123456891234567912345678"; String[][] puzzle0 = mySudokuPuzzle.makeSudoku(config0); if (mySudokuPuzzle.isValidSudoku(puzzle0)) { System.out.println("This puzzle is valid."); } else { System.out.println("This puzzle is invalid."); } System.out.println(mySudokuPuzzle.getPrintableSudoku(puzzle0)); System.out.println("--------------------------------------------------"); // Col and subsquares are invalid String config00 = "9234567899345678913456789124567891235678912346" + "78912345789123456891234567912345678"; String[][] puzzle00 = mySudokuPuzzle.makeSudoku(config00); if (mySudokuPuzzle.isValidSudoku(puzzle00)) { System.out.println("This puzzle is valid."); } else { System.out.println("This puzzle is invalid."); } System.out.println(mySudokuPuzzle.getPrintableSudoku(puzzle00)); System.out.println("--------------------------------------------------"); // Row and column Latin but with invalid subsquares String config1 = "1234567892345678913456789124567891235678912346" + "78912345789123456891234567912345678"; String[][] puzzle1 = mySudokuPuzzle.makeSudoku(config1); if (mySudokuPuzzle.isValidSudoku(puzzle1)) { System.out.println("This puzzle is valid."); } else { System.out.println("This puzzle is invalid."); } System.out.println(mySudokuPuzzle.getPrintableSudoku(puzzle1)); System.out.println("--------------------------------------------------"); // Row Latin but column not Latin and with invalid subsquares String config2 = "12345678912345678912345678912345678912345678" + "9123456789123456789123456789123456789"; String[][] puzzle2 = mySudokuPuzzle.makeSudoku(config2); if (mySudokuPuzzle.isValidSudoku(puzzle2)) { System.out.println("This puzzle is valid."); } else { System.out.println("This puzzle is invalid."); } System.out.println(mySudokuPuzzle.getPrintableSudoku(puzzle2)); System.out.println("--------------------------------------------------"); // A valid sudoku String config3 = "25813764914698532779324685147286319558149273663" + "9571482315728964824619573967354218"; String[][] puzzle3 = mySudokuPuzzle.makeSudoku(config3); if (mySudokuPuzzle.isValidSudoku(puzzle3)) { System.out.println("This puzzle is valid."); } else { System.out.println("This puzzle is invalid."); } System.out.println(mySudokuPuzzle.getPrintableSudoku(puzzle3)); System.out.println("--------------------------------------------------"); } }