### Question:
HMapKF implements MapKF<K>, Cloneable, Serializable { @Override public void increment(K key) { if (this.containsKey(key)) { this.put(key, (float) this.get(key) + 1.0f); } else { this.put(key, 1.0f); } } @SuppressWarnings("unchecked")  HMapKF(int initialCapacity, float loadFactor);  HMapKF(int initialCapacity); @SuppressWarnings("unchecked")  HMapKF();  HMapKF(MapKF<? extends K> m); int size(); boolean isEmpty(); float get(K key); boolean containsKey(K key); float put(K key, float value); void putAll(MapKF<? extends K> m); float remove(K key); void clear(); boolean containsValue(float value); @SuppressWarnings("unchecked") Object clone(); Set<K> keySet(); Collection<Float> values(); Set<MapKF.Entry<K>> entrySet(); String toString(); @Override void plus(MapKF<K> m); @Override double dot(MapKF<K> m); @Override void increment(K key); @Override void increment(K key, float value); float length(); void normalize(); @SuppressWarnings("unchecked") MapKF.Entry<K>[] getEntriesSortedByValue(); MapKF.Entry<K>[] getEntriesSortedByValue(int n);  }### Answer:
@Test public void testIncrement() { HMapKF<String> m = new HMapKF<String>(); assertEquals(0.0f, m.get("one"), 10E-6); m.increment("one", 0.5f); assertEquals(0.5f, m.get("one"), 10E-6); m.increment("one", 1.0f); m.increment("two", 0.0f); m.increment("three", -0.5f); assertEquals(1.5f, m.get("one"), 10E-6); assertEquals(0.0f, m.get("two"), 10E-6); assertEquals(-0.5f, m.get("three"), 10E-6); }