map的遍历，entrySet方法

下面是一个简单map的遍历方法：

Map VasMapService = (Map) so.getUpdatedVAS();
  Map newVasMap = (Map) VasMapService.get(old23GServiceId);
  if (newVasMap != null && newVasMap.size() > 0) {
   Iterator it = newVasMap.entrySet().iterator();
   while (it.hasNext()) {
    java.util.Map.Entry entry = (java.util.Map.Entry) it.next();
    IValueAddService vas = (IValueAddService) entry.getValue();
    vas.setVersion(0);
    vas.setMainServiceId(new4GServiceId);
   }
  }