Method subMap

lib/java/util/TreeMap.java:725–739

(K startKey, K endKey)

        }

        public SortedMap<K, V> subMap(K startKey, K endKey) {
            checkRange(startKey);
            checkRange(endKey);
            Comparator<? super K> c = backingMap.comparator();
            if (c == null) {
                if (toComparable(startKey).compareTo(endKey) <= 0) {
                    return new SubMap<K, V>(startKey, backingMap, endKey);
                }
            } else {
                if (c.compare(startKey, endKey) <= 0) {
                    return new SubMap<K, V>(startKey, backingMap, endKey);
                }
            }
            throw new IllegalArgumentException();
        }

        public SortedMap<K, V> tailMap(K startKey) {
            checkRange(startKey);