Array displaying weird info [I@63376afa

Question

I'm trying to randomly select 6 numbers for a lottery application. Then add the numbers to an array. When I try to display the information contained within the array, it returns [I@63376afa. If I display randomInt outside of an array it displays correctly, but that isn't added to an array. If I try to add randomInt to an array after the for loop has been processed I get an error Type mismatch can't convert int to int[] which makes sense.

import java.util.Random;
public class PracRandom1 
{
    public static void main(String[] args) 
    {
        int randomInt=0;
        int[] numArray = new int[randomInt];
        int[] array = new int[5];
        Random randomNum = new Random();{
            for (int i = 0; i <= array.length; ++i){
            randomInt = 1+randomNum.nextInt(6); 
                        System.out.println("Array Random numbers: " + numArray);
            }
}}}

Just discussed a similar question here: http://stackoverflow.com/a/17508107/2291425 — Evgeny Tanhilevich, Jul 07 '13 at 01:19
I want it to print an actual number. If I were to do System.out.println(randomInt) I would get numbers but I need those values to be within an array for the second part of the project. — Gryphin, Jul 07 '13 at 02:48

score 1 · Answer 1 · answered Jul 07 '13 at 01:21

1

Check out java.util.Arrays.toString().

Arrays do not have a terribly useful toString() implementation out of the box.

answered Jul 07 '13 at 01:21

Arthur Dent

785
3
7

score 0 · Accepted Answer · edited May 23 '17 at 11:56

To get a human-readable toString(), you must use Arrays.toString(), like this:

System.out.println(Arrays.toString(array));

Java's toString() for an array is to print [, followed by a character representing the type of the array's elements (in your case I for int), followed by @ then the "identity hash code" of the array (think of it like you would a "memory address").

This sad state of affairs is generally considered as a "mistake" with java.

See this answer for a brief list of other "mistakes".

Array displaying weird info [I@63376afa

2 Answers2