Java Utililty Methods HashMap Counter

Integer increment(HashMap m, X key)
Increment the value associated with key by 1, or set it to 1 if there was no mapping for key

return m.put(key, ((m.get(key) == null) ? 1 : (m.get(key) + 1)));

void incrementHashMap(HashMap map, String key, int n)
increment Hash Map

int count;
Integer countI = (Integer) map.get(key);
if (countI == null)
 count = 0;
else {
 count = countI;
map.put(key, count + n);
...

void incrementMap(HashMap map, Integer key)
increment Map

Integer count = map.get(key);
if (count == null) {
 map.put(key, 1);
} else {
 map.put(key, count + 1);

void incrementTwoLevelHashMap(HashMap map, String key1, String key2, int n)
increment Two Level Hash Map

HashMap map2 = (HashMap) map.get(key1);
if (map2 == null) {
 map2 = new HashMap();
 map.put(key1, map2);
incrementHashMap(map2, key2, n);