@Override
    public V get(Object k) {
        return containsKey(k) ? super.get(k) : defaultValue;
    }
@Test
    public void defaultToFive() {
        map = new DefaultHashMap<>(5);
        loadMap();
        assertEquals("missing 1", 1, (int) map.get(ONE));
        assertEquals("missing 2", 2, (int) map.get(TWO));
        assertEquals("three?", 5, (int) map.get(THREE));
        assertEquals("four?", 5, (int) map.get(FOUR));
    }