public SortedMap <K, V> headMap(K endKey)
{
lock (mutex)
{
return(new SynchronizedSortedMap <K, V>(sm.headMap(endKey),
mutex));
}
}
public SortedMap <K, V> headMap(K before)
{
return(new UnmodifiableSortedMap <K, V>(sm.headMap(before)));
}