Re: Array.sort()

"John B. Matthews" <nospam@nospam.invalid>
Fri, 12 Mar 2010 17:26:30 -0500
In article
 dendeezen <> wrote:

Thanks for the great help. I solved the problems. But I have still
one left.

How can I copy the arry lotto into the arry list, so that the are
really identical, so that

I infer that you want to compare both the original and sorted arrays.
Here's how I'd organize the code to keep the implementation private. I
sense this is homework, but I don't know the objective. I've shown ways
to copy, sort and format an array; I've left selecting without
replacement as an exercise.

import java.util.Arrays;
import java.util.Random;

public class Lotto {

    private static final Random generator = new Random();
    private static final int MAX = 6;
    private int[] picks = new int[MAX];

    public static void main(String[] args) {
        Lotto lotto = Lotto.newInstance();

    public static Lotto newInstance() {
        return new Lotto();

    private Lotto() {
        for (int i = 0; i < picks.length; i++) {
            picks[i] = pickOne();

    public String original() {
        return toString(picks);

    public String sorted() {
        int[] temp = Arrays.copyOf(picks, picks.length);
        return toString(temp);

    private String toString(int[] a) {
        StringBuilder sb = new StringBuilder();
        for (int i : a) {
            sb.append(' ');
        return sb.toString();

    private int pickOne() {
        // TODO avoid duplicates
        return generator.nextInt(42) + 1;

John B. Matthews
trashgod at gmail dot com

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