TreeMap will return non-null firstKey for an empty submap

Name: clC74495 Date: 07/08/99


Create an empty submap of a TreeMap, whose interval is specified in
such a way as to be of size 0. Send firstKey() to it. Instead of
throwing NoSuchElementException, it will return the first key, as
illustrated by the following test case.

      SortedMap m = new TreeMap();
      m.put(new Integer(1), new Integer(1));
      m.put(new Integer(2), new Integer(2));
      m.put(new Integer(3), new Integer(3));
      m.put(new Integer(4), new Integer(4));
      SortedMap m2 = m.subMap(new Integer(4), new Integer(4));
      System.out.println("m2's size is " + m2.size());
      Object k = m2.firstKey();
      System.out.println("k = " + k);
(Review ID: 85300)
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