Latin square

package se.dalsit.puzzle;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Random;

public class Board {

        private int matrix [][] = new int [4][4];
        private Random rand,secRand;
        private int i = 0;
        private int j = 0;
        private boolean add = false;
        int number = 0;


        public Board() {
            i = 0;
            j = 0;
            init ();
        }



        private void init() {
            rand = new Random (System.currentTimeMillis());


            generateNumbers(j);


        }


        private void generateNumbers (int row) {
            if (i == 0)  {
                matrix[0][row] = rand.nextInt(4) + 1;
                i++;
            }

            number = rand.nextInt(4) + 1;

            for (int x = 0; x < i; x++) {
                if (matrix[x][row] == number) {
                    number = 0;
                    j  = row;
                    add = false;
                    break;
                }else {
                    add = true;
                    break;
                }
            }


            if (add) {

            matrix[i][row] = number;
            i++;
            add = false;
            }


                if (i < 4) {
                    generateNumbers(j);
                }else if (j <4){
                    i =0;
                    j++;
                    add = false;
                    generateNumbers(j);
                }else {
                    i = 0;
                    j = 0;
                    finish();
                }
        }



        private void finish() {
            System.out.println("Finish!! ;d");

        }





        private void checkrow(int i) {

        }

        private void checkColumn (int j) {

        }



        public void update() {

            System.out.println(i + " " + j);


        }

        public void draw(Graphics2D g2d) {

        for (int y = 0; y< 4; y++) {
            for (int x = 0; x<4; x++) {

                g2d.setColor(Color.BLUE);
                g2d.fillRect((128*x)+128, (128*y)+128, 128, 128);
                g2d.setColor(Color.BLACK);
                g2d.drawRect((128*x)+128, (128*y)+128, 128, 128);

                Font font = new Font ("Dialog",Font.BOLD,20);
                g2d.setFont(font);
                g2d.drawString (""+matrix[x][y] , (128*x)+192, (128*y)+192);


                }

            }
        }
}