/** Create a map from Integers -5 to -1 to Strings "A"-"E". */
private static ConcurrentNavigableMap dmap5() {
ConcurrentSkipListMap map = new ConcurrentSkipListMap();
assertTrue(map.isEmpty());
map.put(m1, "A");
map.put(m5, "E");
map.put(m3, "C");
map.put(m2, "B");
map.put(m4, "D");
assertFalse(map.isEmpty());
assertEquals(5, map.size());
return map.descendingMap();
}
/** Create a map from Integers 1-5 to Strings "A"-"E". */
private static ConcurrentNavigableMap map5() {
ConcurrentSkipListMap map = new ConcurrentSkipListMap();
assertTrue(map.isEmpty());
map.put(zero, "Z");
map.put(one, "A");
map.put(five, "E");
map.put(three, "C");
map.put(two, "B");
map.put(four, "D");
map.put(seven, "F");
assertFalse(map.isEmpty());
assertEquals(7, map.size());
return map.subMap(one, true, seven, false);
}