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POJava: How to randomize an array list without duplicates
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copied!<pre><code>import java.util.Random; public class Sudoku { int[][] SquareNumbers = { { 4, 3, 5, 8, 7, 6, 1, 2, 9 }, { 8, 7, 6, 2, 1, 9, 3, 4, 5 }, { 2, 1, 9, 4, 3, 5, 7, 8, 6 }, { 5, 2, 3, 6, 4, 7, 8, 9, 1 }, { 9, 8, 1, 5, 2, 3, 4, 6, 7 }, { 6, 4, 7, 9, 8, 1, 2, 5, 3 }, { 7, 5, 4, 1, 6, 8, 9, 3, 2 }, { 3, 9, 2, 7, 5, 4, 6, 1, 8 }, { 1, 6, 8, 3, 9, 2, 5, 7, 4 } }; Random Digits = new Random(); // random numbers to exchange Rows Random HiddenNumbers = new Random(); int Grid[][] = new int[9][9]; public int[][] Generator() { for (int x = 0; x < Digits.nextInt(); x++) { for (int da = 0; da < 3; da++) { } } return SquareNumbers; } int[][] Hide() { for (int i = 0; i < 9; i++) for (int j = 0; j < 9; j++) Grid[i][j] = SquareNumbers[i][j]; int Row, Columns, Concealer; Concealer = 55 + Digits.nextInt(1); for (int i = 0; i < Concealer; i++) { Row = HiddenNumbers.nextInt(9); Columns = HiddenNumbers.nextInt(9); Grid[Row][Columns] = -1; } return Grid; } public int[][] getSquareNumbers() { return SquareNumbers; } public void setSquareNumbers(int[][] SquareNumbers) { this.SquareNumbers = SquareNumbers; } private static Sudoku instance = null; protected Sudoku() { // Exists only to defeat instantiation. } public static Sudoku getInstance() { if (instance == null) { instance = new Sudoku(); } return instance; } } </code></pre> <p>Instead of a double array list, is there a way to randomize it so it works like a Sudoku game? As in it has no duplicates within columns or rows and every three by three smaller grid uses a number once?</p>

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