### Question:
Bag extends AbstractCollection<T> implements Serializable { @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj == null || getClass() != obj.getClass()) { return false; } Bag<?> other = (Bag<?>)obj; if (size != other.size) { return false; } return map.equals(other.map); } Bag();  Bag(Map<? extends T, ? extends Integer> map); private  Bag(Map<T, Integer> map, int size);  Bag(Iterable<? extends T> iterable); @Deprecated static Bag<T> create(); @Deprecated static Bag<T> create(Iterable<? extends T> iterable); @Deprecated static Bag<T> create(Map<? extends T, ? extends Integer> map); @Override boolean add(T item); @Override Iterator<T> iterator(); @Override int size(); int add(T item, int increment); int removeAll(T item); int set(T item, int count); int count(T item); Set<Entry<T, Integer>> unique(); Set<T> uniqueItems(); Entry<T, Integer> getMax(); Entry<T, Integer> getMin(); Bag<T> createSorted(Order order); Map<T, Integer> toMap(); @Override int hashCode(); @Override boolean equals(Object obj); @Override String toString();  }### Answer:
@Test public void testCopy() { Bag<String> copy = new Bag<>(bag1); assertTrue(copy.equals(bag1)); }