createQueuesWithGroups.apex

List<List<String>> allQueues = new List<List<String>>{
    new List<String>{'DDA Test 1','DDA_Test_1'},
    new List<String>{'DDA Test 2','DDA_Test_2'}
};

List<Group>        newQueues    = new List<Group>();
List<QueueSObject> newQueueObjs = new List<QueueSObject>();
List<Group>        newGroups    = new List<Group>();
List<GroupMember>  newMembers   = new List<GroupMember>();
Map<String,Group>  mapQueues    = new Map<String,Group>();

//Create Queues
Group q;
QueueSObject qo;

for(List<String> qName : allQueues){
    q               = new Group();
    q.Type          = ‘Queue’;
    q.Name          = qName[0];
    q.DeveloperName = qName[1];
    newQueues.add(q);
    q               = null;

}

insert newQueues;

for(Group thisQ : newQueues){
    //Associate Object to Queue
    qo             = new QueueSObject();
    qo.SobjectType = 'Case';
    qo.QueueId     = thisQ.Id;
    newQueueObjs.add(qo);

    qo = null;
}

insert newQueueObjs;



//Create Groups
Group g;
GroupMember gm;

for (Group thisQueue : newQueues){
    g               = new Group();
    g.Type          = 'Regular';
    g.Name          = thisQueue.Name;
    g.DeveloperName = thisQueue.DeveloperName;
    newGroups.add(g);
    mapQueues.put(thisQueue.Name,thisQueue);
    g               = null;
}

insert newGroups;

for(Group thisGroup : newGroups){

    //Add Group to Queue

    gm               = new GroupMember();
    gm.UserOrGroupId = thisGroup.Id;
    gm.GroupId       = mapQueues.get(thisGroup.Name).Id;
    newMembers.add(gm);

    gm = null;
}

insert newMembers;