key = new Integer(99999).toString();
ceilingKey = (String) descendingKeySet.ceiling(key);
assertEquals(108, Integer.parseInt(ceilingKey));
keySet = navigableMap_startExcluded_endIncluded.navigableKeySet();
descendingKeySet = keySet.descendingSet();
keyArray = (String[]) descendingKeySet
.toArray(new String[descendingKeySet.size()]);
for (int i = 0, j = 109; i < keyArray.length; i++) {
ceilingKey = (String) descendingKeySet.ceiling(keyArray[i]);
assertEquals(new Integer(j - i).toString(), ceilingKey);