A very simple problem with ArrayList<int[]> 2

[lellus]

Hi. I don't understand this strange behaviour.

import java.util.ArrayList;

public class Main {

public static void main(String[] args) {

int[] number = null;
ArrayList<int[]> numbers = null;

number = new int[1];
numbers = new ArrayList<int[]>();

for ( int value = 0; value<10 ; value++){
number[0] = value;
System.out.println(number[0]);
numbers.add(number);
}

//Output 0 1 2 3 4 5 6 7 8 9

for (int index = 0; index<numbers.size(); index++){
System.out.println(numbers.get(index)[0]);
}

//Output 9 9 9 9 9 9 9 9 9 9
}

Why the second output is different, why i have no store the sequence of numbers into Arraylist as vectors of integers?
Thanks

 

[sprjp2]

Arrays are reference types. So after the first loop, your arraylist will contain ten references to the same array.

 

[tsuji]

The entries would reference the same object which finally settled in number[0]=9. Had only its clone be added each time, it wouldn't be the same.
>numbers.add(number);
[tt]numbers.add(number[blue].clone()[/blue]);[/tt]

 

[lellus]

yes yes yes
I'm very stupid!!
Thank you