How to get the Group Id of symbian using J2ME

I got the group names by using

ContactList 开发者_运维百科clist=(ContactList)pim.openPIMList(PIM.CONTACT_LIST, PIM.READ_WRITE);

String[] s=clist.getCategories();

and now i want the groupid like i am getting the contact id using Contact.uid

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No such thing as Group Id in JSR-75, I'm afraid. Categories are just String.