Method headMap

Ports/CLDC11/src/java/util/TreeMap.java:715–738

(K endKey)

        }

        public SortedMap<K, V> headMap(K endKey) {
            Comparator<? super K> cmp = backingMap.comparator;
            if (cmp == null) {
                java.lang.Comparable<K> object = toComparable(endKey);
                if (hasStart && object.compareTo(startKey) < 0) {
                    throw new IllegalArgumentException();
                }
                if (hasEnd && object.compareTo(this.endKey) > 0) {
                    throw new IllegalArgumentException();
                }
            } else {
                if (hasStart
                        && backingMap.comparator().compare(endKey, startKey) < 0) {
                    throw new IllegalArgumentException();
                }
                if (hasEnd && backingMap.comparator().compare(endKey, this.endKey) >= 0) {
                    throw new IllegalArgumentException();
                }
            }
            if (hasStart) {
                return new SubMap<K, V>(startKey, backingMap, endKey);
            }
            return new SubMap<K, V>(backingMap, endKey);
        }

        @Override
        public boolean isEmpty() {