### Question:
HMapIL implements MapIL, Cloneable, Serializable { @Override public long dot(MapIL m) { long s = 0; for (MapIL.Entry e : m.entrySet()) { int key = e.getKey(); if (this.containsKey(key)) { s += this.get(key) * e.getValue(); } } return s; } HMapIL(int initialCapacity, float loadFactor);  HMapIL(int initialCapacity);  HMapIL();  HMapIL(MapIL m); @Override int size(); @Override boolean isEmpty(); @Override long get(int key); @Override boolean containsKey(int key); @Override long put(int key, long value); @Override void putAll(MapIL m); @Override long remove(int key); @Override void clear(); @Override boolean containsValue(long value); @Override Object clone(); @Override Set<Integer> keySet(); @Override Collection<Long> values(); @Override Set<MapIL.Entry> entrySet(); @Override String toString(); @Override void plus(MapIL m); @Override long dot(MapIL m); @Override void increment(int key); @Override void increment(int key, long value); MapIL.Entry[] getEntriesSortedByValue(); MapIL.Entry[] getEntriesSortedByValue(int n);  }### Answer:
@Test public void testDot() throws IOException { HMapIL m1 = new HMapIL(); m1.put(1, 2L); m1.put(2, 1L); m1.put(3, 3L); m1.put(Integer.MAX_VALUE, (long) Integer.MAX_VALUE); HMapIL m2 = new HMapIL(); m2.put(1, 1L); m2.put(2, 4L); m2.put(4, 5L); m2.put(Integer.MAX_VALUE, (long) Integer.MAX_VALUE); long s = m1.dot(m2); assertTrue(s > Integer.MAX_VALUE); assertEquals((long) Integer.MAX_VALUE * Integer.MAX_VALUE + 6L, s); }