protected void addToChildren(ZipEntry parent,ZipEntry child){
  List childList=(List)children.get(parent);
  if (childList == null) {
    childList=new ArrayList();
    children.put(parent,childList);
  }
  childList.add(child);
}

protected void addToChildren ( ZipEntry parent , ZipEntry child ) { List childList = ( List ) children . get ( parent ) ; if ( childList == null ) { childList = new ArrayList ( ) ; children . put ( parent , childList ) ; } childList . add ( child ) ; }
adds the specified child to the internal collection of the parent ' s children .
