private int compareStyle(Checklist o) {
if (!hasStyle()) return o.hasStyle() ? 1 : compareType(o);
else if (!o.hasStyle()) return -1;
else {
int c = checklist.compareTo(o.getChecklist());
return c != 0 ? c : compareType(o);
}
}
private int compareType(Checklist o) {
if (!hasType()) return o.hasType() ? 1 : compareType(o);
else return !o.hasStyle() ? -1 : checklist.compareTo(o.getChecklist());
}