### Question:
HMapIF implements MapIF, Cloneable, Serializable { @Override public double dot(MapIF m) { double s = 0.0f; for (MapIF.Entry e : m.entrySet()) { int key = e.getKey(); if (this.containsKey(key)) { s += this.get(key) * e.getValue(); } } return s; } HMapIF(int initialCapacity, float loadFactor);  HMapIF(int initialCapacity);  HMapIF();  HMapIF(MapIF m); int size(); boolean isEmpty(); float get(int key); boolean containsKey(int key); float put(int key, float value); void putAll(MapIF m); float remove(int key); void clear(); boolean containsValue(float value); Object clone(); Set<Integer> keySet(); Collection<Float> values(); Set<MapIF.Entry> entrySet(); String toString(); @Override void plus(MapIF m); @Override double dot(MapIF m); @Override void increment(int key); @Override void increment(int key, float value); float length(); void normalize(); MapIF.Entry[] getEntriesSortedByValue(); MapIF.Entry[] getEntriesSortedByValue(int n);  }### Answer:
@Test public void testDot() throws IOException { HMapIF m1 = new HMapIF(); m1.put(1, 2.3f); m1.put(2, 1.9f); m1.put(3, 3.0f); HMapIF m2 = new HMapIF(); m2.put(1, 1.2f); m2.put(2, 4.3f); m2.put(4, 5.0f); assertEquals(10.93, m1.dot(m2), 10e-6); }