decendingMap = navigableMap_startIncluded_endExcluded.descendingMap();
key = new Integer(100).toString();
assertEquals(100, decendingMap.floorEntry(key).getValue());
for (int i = 101; i < 109; i++) {
key = new Integer(i).toString();
assertEquals(i, decendingMap.floorEntry(key).getValue());
}
key = new Integer(109).toString();
assertNull(decendingMap.floorEntry(key));
decendingMap = navigableMap_startIncluded_endIncluded.descendingMap();