public class ChristmassDraw {

    private static Random random = ThreadLocalRandom.current();
    private static int count;

    public static void main(String args[]) {
        // Array of values for couples consisting of two values for each array.
        String[] couplesArray1 = {"x1", "y1"};
        String[] couplesArray2 = {"x2", "y2"};
        String[] couplesArray3 = {"x3", "y3"};
        String[] couplesArray4 = {"x4", "y4"};
        String[] couplesArray5 = {"x5", "y5"};

        // The last 5 arrays above is stored into another array in order to randomise the order of the couples easily.
        String[][] couplesArrayA = new String[][]{{couplesArray1[0]}, {couplesArray2[0]}, {couplesArray3[0]}, {couplesArray4[0]}, {couplesArray5[0]}};
        String[][] couplesArrayB = new String[][]{{couplesArray1[1]}, {couplesArray2[1]}, {couplesArray3[1]}, {couplesArray4[1]}, {couplesArray5[1]}};

        String[][] couplesArrayC = new String[][]{{couplesArray1[0]}, {couplesArray1[1]}, {couplesArray3[0]}, {couplesArray3[1]}, {couplesArray5[0]}};
        String[][] couplesArrayD = new String[][]{{couplesArray2[0]}, {couplesArray2[1]}, {couplesArray4[0]}, {couplesArray4[1]}, {couplesArray5[1]}};

        //shuffle stuff
        couplesArrayA = shuffleArray(couplesArrayA);
        couplesArrayB = shuffleArray(couplesArrayB);
        couplesArrayC = shuffleArray(couplesArrayC);
        couplesArrayD = shuffleArray(couplesArrayD);

        // THIS YEAR'S DRAW
        System.out.println("List of this year's draw:");

        printCouples(couplesArrayA);
        printCouples(couplesArrayB);
        printCouples(couplesArrayC);
        printCouples(couplesArrayD);

    }

    private static void printCouples(String[][] couplesArray) {
        for (String[] q : couplesArray) {

            System.out.print(Arrays.toString(q).replace("[", "").replace("]", ""));
            System.out.print(" ");

            count++;
            if (count == 2) {
                count = 0;
                System.out.println();
            }
        }
    }

    private static String[][] shuffleArray(String[][] couplesArray) {
        for (int i = couplesArray.length - 1; i > 0; i--) {
            int index = random.nextInt(i + 1);
            // This swaps the sequence of values within the array.
            String[] r = couplesArray[index];
            couplesArray[index] = couplesArray[i];
            couplesArray[i] = r;
        }
        return couplesArray;
    }
}