order a list like in xml schema java

I have an xml like this one:

<part>
    <desc>qwe</desc>
    <qty>2</qty>
</part>
<part>
    <desc>AAAA</desc>
    <qty>1</qty>
    <part>
        <desc>BBBB</desc>
        <qty>1</qty>
            <part>
                <desc>CCCC</desc>
                <qty>13</qty>
                    <part>
                        <desc>DDDD</desc>
                        <qty>12</qty>
                            <part>
                                <desc>EEEE</desc>
                                <qty>21</qty>
                            </part>
                    </part>
            </part>
            <part>
                <desc>CCCC1111</desc>
                <qty>13</qty>
                    <part>
                        <desc>DDDD1111</desc>
                        <qty>12</qty>
                            <part>
                                <desc>EEEE1111</desc>
                                <qty>21</qty>
                            </part>
                    </part>
            </part>
    </part>
    <part>
        <desc>G</desc>
        <qty>1</qty>
            <part>
                <desc>H</desc>
                <qty>13</qty>
                    <part>
                        <desc>I</desc>
                        <qty>12</qty>
                    </part>
            </part>
    </part>

Now I want to print it out in the "same" structure. I created a method, but the output differs from expectes:

    public static void itarate(List<Part> list){
    for (int i = 0; i<list.size(); i++){
        System.out.println(list.get(i).getDesc() + " x " + list.get(i).getQty());
        if (list.get(i).getListParts() != null){
            System.out.print("  ");
            itarate(list.get(i).getListParts());

        }
    }
}

The output:

qwe x 2
AAAA x 1
  BBBB x 1
  CCCC x 13
  DDDD x 12
  EEEE x 21
CCCC1111 x 13
  DDDD1111 x 12
  EEEE1111 x 21
G x 1
  H x 13
  I x 12

but I actually want something like:

qwe x 2
AAAA x 1
  BBBB x 1
    CCCC x 13
      DDDD x 12
        EEEE x 21
  CCCC1111 x 13
    DDDD1111 x 12
      EEEE1111 x 21
G x 1
  H x 13
    I x 12

How can I achieve that (so the xml structure is similar to the code output)? Thanks in advance.