subMap

Returns a new TreeMap containing entries whose keys are in the range [from, to) (from inclusive, to exclusive).

Example:

    var map = new TreeMap<string,string> ((a, b) => {
        return strcmp (a, b);
    });
    map.put ("a", "1");
    map.put ("b", "2");
    map.put ("c", "3");
    map.put ("d", "4");
    var sub = map.subMap ("b", "d");
    assert (sub.size () == 2);
    assert (sub.containsKey ("b"));
    assert (sub.containsKey ("c"));

Parameters:

from	the lower bound (inclusive).
to	the upper bound (exclusive).

Returns:

a new TreeMap with the sub-range.