java - Reverse XML Child tags -

what best option reverse lines / tags in xml in java

e.g.

<?xml version="1.0"?> <abc>     <xyz1 test1="123" test2="345">     </xyz1>     <xyz2 test1="456">     </xyz2> </abc> </xml> 

end result

<?xml version="1.0"?>     <abc>             <xyz2 test1="456">         </xyz2>         <xyz1 test2="345" test1="123">         </xyz1>     </abc> </xml> 

using comparator this:

public int compare(object arg0, object arg1) {                                                                                                                     if (arg0 instanceof element && arg1 instanceof element) {                              return ((element) arg0).getattribute("id").compareto(                                          ((element) arg1).getattribute("id"));                  } else {                                                                               return ((node) arg0).getnodename().compareto(                                                  ((node) arg1).getnodename());                          }                                                                       }        

here recursive method can use. puts child nodes in list , sorts them using comparator. don't think can sort attributes, because docs state namednodemaps not maintained in order.

public static void sortchildren(node parent, comparator<node> comparator){     nodelist children = parent.getchildnodes();     if(children.getlength() == 0){         return;     }     list<node> nodes = new arraylist<node>();     for(int = 0 ; < children.getlength() ; i++){         node n = children.item(i);         sortchildren(n, comparator);         nodes.add(n);     }     collections.sort(nodes, collections.reverseorder(comparator));     for(node n : nodes){         parent.appendchild(n);     } }  public static void main(string[] args) throws exception {      document doc = documentbuilderfactory.newinstance().newdocumentbuilder().parse(new file("file.xml"));     element root = doc.getdocumentelement();      //sort recursively     sortchildren(root, new defaultnodenamecomparator());      //print out (for debugging)     outputformat format = new outputformat(doc);     format.setlinewidth(65);     format.setindenting(true);     format.setindent(2);     writer out = new stringwriter();     xmlserializer serializer = new xmlserializer(out, format);     serializer.serialize(doc);     system.out.println(out.tostring()); }  class defaultnodenamecomparator implements comparator<node> {     public int compare(node arg0, node arg1) {         return arg0.getnodename().compareto(arg1.getnodename());     } }