+ public void remove(K k, V v) {
+ if (hm.get(k)==null) return;
+ HashSet<V> hs = hm.get(k);
+ if (hs==null) return;
+ size -= hs.size();
+ hs.remove(v);
+ size += hs.size();
+ }
+
+ public void removeAll(K k, Iterable<V> iv) {
+ for(V v : iv) remove(k, v);
+ }
+
+ public void clear() { hm.clear(); }
+
+ public boolean contains(K k, V v) {
+ return hm.get(k)!=null && hm.get(k).contains(v);
+ }
+
+ public void addAll(HashMapBag<K,V> hmb) {
+ for(K k : hmb) addAll(k, hmb.getAll(k));
+ }
+ public void removeAll(HashMapBag<K,V> hmb) {
+ for(K k : hmb) removeAll(k, hmb.getAll(k));
+ }
+