public void concQ(Queue<T> q) {
if (size == 0) {
front = q.front;
rear = q.rear;
size = q.size;
} else {
rear.setNext(q.front);
rear = q.rear;
size = size + q.size;
}
}
public T front() {
if (front == null) {
return null;
}
return front.getData();
}
