public int get(Object key) {
    if (key == null) {
      return getForNullKey();
    }
    int hash = hash(hashingStrategy.hashCode(key));
    for (Entry e = table[indexFor(hash, table.length)]; e != null; e = e.next) {
      Object k;
      if (e.hash == hash && ((k = e.key) == key || hashingStrategy.equals(k, key))) {
        return e.value;
      }
    }
    return 0;
  }
Returns the value to which the specified key is mapped, or {@code null} if this map contains no
mapping for the key.

<p>
More formally, if this map contains a mapping from a key {@code k} to a value {@code v} such
that {@code (key==null ? k==null :
key.equals(k))}, then this method returns {@code v}; otherwise it returns {@code null}. (There
can be at most one such mapping.)

<p>
A return value of {@code null} does not <i>necessarily</i> indicate that the map contains no
mapping for the key; it's also possible that the map explicitly maps the key to {@code null}.
The {@link #containsKey containsKey} operation may be used to distinguish these two cases.

@see #put(Object, int)
geode-core/src/main/java/org/apache/geode/cache/query/internal/ObjectIntHashMap.java