/*Run it only on your computer because it has multiple inputs*/ /*~~~~~~~~~~~~~~~~~~~ | Creator: | | Eliya Ben Baruch| ~~~~~~~~~~~~~~~~~~~*/ import java.util.*; public class sudokuGame { public static void main(String[] args) { sudokuCreator sudoku = new sudokuCreator(); } } public class sudokuCreator { public static Scanner reader = new Scanner(System.in); private int[][] solutionPattern = new int[9][9]; // The Sudoku pattern private int[][] userPattern = new int[9][9]; private String[][] tries = new String[9][9]; // The numbers I have tried for every index public sudokuCreator() { createPattern(); // Creating a legal Soduko chooseHints();// Inserting values to the userPattern variable. getPattern(); // Printing the Soduku's pattern while (!checkWin()) { System.out.println("Choose row(1-9):"); int row = reader.nextInt(); System.out.println("Choose col(1-9):"); int col = reader.nextInt(); System.out.println("Choose number(1-9):"); int number = reader.nextInt(); setPattern(row, col, number); // Setting the userPattern varivale with the new values getPattern(); // Printing the new array } System.out.println("Well done, you cracked the Sudoku's pattern!"); } public void createPattern() { for (int i = 0; i < tries.length; i++) { // String has null as default so I have to initialize each index for (int j = 0; j < tries[i].length; j++) tries[i][j] = new String(); } int[][] pattern = new int[9][9]; for (int row = 0; row < pattern.length; row++) { for (int col = 0; col < pattern[row].length;) { int number = (int)(Math.random() * 9 + 1); // Random number for the index if (tries[row][col].indexOf("" + number) == -1 && legalPlace(pattern, row, col, number)) { tries[row][col] += number; pattern[row][col++] = number; } else if (tries[row][col].length() >= 9) { if (col == 0) { tries[row][col] = ""; pattern[row][col] = 0; col = 8; pattern[--row][col] = 0; } else { tries[row][col] = ""; pattern[row][col] = 0; pattern[row][--col] = 0; } } } } this.solutionPattern = pattern; } public boolean legalPlace(int[][] pattern, int row, int col, int number) { for (int checkRow = 0; checkRow < 9; checkRow++) { // Goes over the rows and checks if the number exists if (pattern[checkRow][col] == number) { tries[row][col] += number; return false; } } for (int checkCol = 0; checkCol < 9; checkCol++) { // Goes over the columns and checks if the number exists if (pattern[row][checkCol] == number) { tries[row][col] += number; return false; } } for (int checkRow = row - (row % 3); checkRow <= row + (2 - row % 3); checkRow++) { for (int checkCol = col - (col % 3); checkCol <= col + (2 - col % 3); checkCol++) { if (pattern[checkRow][checkCol] == number) { tries[row][col] += number; return false; } } } return true; } public void setPattern(int row, int col, int number) { if (row > 9 || row < 1 || col > 9 || col < 1 || number < 1 || number > 9) { // Checking for legal index and number if (row > 9 || row < 1) System.out.println("The row value is out of range"); if (col > 9 || col < 1) System.out.println("The column value is out of range"); if (number < 1 || number > 9) System.out.println("The number you enterd is out of range"); } else if (legalPlace(userPattern, row - 1, col - 1, number)) userPattern[row - 1][col - 1] = number; // Feeting the values for the array } public void getPattern() { String squareLine = " ------------ ----------- ------------"; System.out.println(" 1 2 3 4 5 6 7 8 9"); for (int row = 0; row < userPattern.length; row++) { System.out.println(row % 3 == 0 ? squareLine : ""); // Make a square for (int col = 0; col < userPattern[row].length; col++) System.out.print((col == 0 ? (row + 1) + "| " : " ") + (userPattern[row][col] != 0 ? userPattern[row][col] + " |" : " |")); // Printing only the non-zero values(The zero is default as creating an array) System.out.println(); } System.out.println(squareLine); } public boolean checkWin() { for (int row = 0; row < 9; row++) for (int col = 0; col < 9; col++) if (Arrays.equals(userPattern, solutionPattern)) // Checking if the user is right by his solution return true; return false; } public void chooseHints() { for (int row = 0, hint = (int)(Math.random() * 3 + 1); row < solutionPattern.length; row++, hint = (int)(Math.random() * 3 + 1)) for (int col = 0; col < solutionPattern[row].length; col++, hint = hint == 0 ? (int)(Math.random() * 3 + 1) : hint - 1) if (hint == 0) userPattern[row][col] = solutionPattern[row][col]; // The hint varivale is for inserting random values for hints } }

Sudoku Generator