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Deep copy HashMap with mutable objects inside

Drab Dove on Apr 23, 2021

public class DeepClone
{
    public static void main(String[] args)
    {
        Map<Long, Item> itemMap = Stream.of(
                entry(0L, new Item(2558584)),
                entry(1L, new Item(254243232)),
                entry(2L, new Item(986786)),
                entry(3L, new Item(672542)),
                entry(4L, new Item(4846)),
                entry(5L, new Item(76867467)),
                entry(6L, new Item(986786)),
                entry(7L, new Item(7969768)),
                entry(8L, new Item(68868486)),
                entry(9L, new Item(923)),
                entry(10L, new Item(986786)),
                entry(11L, new Item(549768)),
                entry(12L, new Item(796168)),
                entry(13L, new Item(868421)),
                entry(14L, new Item(923)),
                entry(15L, new Item(986786)),
                entry(16L, new Item(549768)),
                entry(17L, new Item(4846)),
                entry(18L, new Item(4846)),
                entry(19L, new Item(76867467)),
                entry(20L, new Item(986786)),
                entry(21L, new Item(7969768)),
                entry(22L, new Item(923)),
                entry(23L, new Item(4846)),
                entry(24L, new Item(986786)),
                entry(25L, new Item(549768))
        ).collect(entriesToMap());


        Map<Long, Item> clone = DeepClone.deepClone(itemMap);
        clone.remove(1L);
        clone.remove(2L);

        System.out.println(itemMap);
        System.out.println(clone);
    }

    private DeepClone() {}

    public static <T> T deepClone(final T input)
    {
        if (input == null) return null;

        if (input instanceof Map<?, ?>) {
            return (T) deepCloneMap((Map<?, ?>) input);
        } else if (input instanceof Collection<?>) {
            return (T) deepCloneCollection((Collection<?>) input);
        } else if (input instanceof Object[]) {
            return (T) deepCloneObjectArray((Object[]) input);
        } else if (input.getClass().isArray()) {
            return (T) clonePrimitiveArray((Object) input);
        }

        return input;
    }

    private static Object clonePrimitiveArray(final Object input)
    {
        final int length = Array.getLength(input);
        final Object output = Array.newInstance(input.getClass().getComponentType(), length);
        System.arraycopy(input, 0, output, 0, length);
        return output;
    }

    private static <E> E[] deepCloneObjectArray(final E[] input)
    {
        final E[] clone = (E[]) Array.newInstance(input.getClass().getComponentType(), input.length);
        for (int i = 0; i < input.length; i++) {
            clone[i] = deepClone(input[i]);
        }

        return clone;
    }

    private static <E> Collection<E> deepCloneCollection(final Collection<E> input)
    {
        Collection<E> clone;
        if (input instanceof LinkedList<?>) {
            clone = new LinkedList<>();
        } else if (input instanceof SortedSet<?>) {
            clone = new TreeSet<>();
        } else if (input instanceof Set) {
            clone = new HashSet<>();
        } else {
            clone = new ArrayList<>();
        }

        for (E item : input) {
            clone.add(deepClone(item));
        }

        return clone;
    }

    private static <K, V> Map<K, V> deepCloneMap(final Map<K, V> map)
    {
        Map<K, V> clone;
        if (map instanceof LinkedHashMap<?, ?>) {
            clone = new LinkedHashMap<>();
        } else if (map instanceof TreeMap<?, ?>) {
            clone = new TreeMap<>();
        } else {
            clone = new HashMap<>();
        }

        for (Map.Entry<K, V> entry : map.entrySet()) {
            clone.put(deepClone(entry.getKey()), deepClone(entry.getValue()));
        }

        return clone;
    }
}

Source: stackoverflow.com

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"Deep copy HashMap with mutable objects inside" Code Answer's