Java Utililty Methods Map Copy

List of utility methods to do Map Copy

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Map Copy

Description

The list of methods to do Map Copy are organized into topic(s).

Method

Map copy(final Map source)
Clones a map.

if (source == null) {
 return null;
final Map<K, V> result = new HashMap<K, V>();
result.putAll(source);
return result;

void copy(Map dest, Map src)
copy

for (Object k : src.keySet()) {
 Object v = src.get(k);
 dest.put(k, v);

void copy(Map master, Map slave)
copy

slave.clear();
Iterator itr = master.entrySet().iterator();
while (itr.hasNext()) {
 Map.Entry entry = (Map.Entry) itr.next();
 Object key = entry.getKey();
 Object value = entry.getValue();
 slave.put(key, value);

Map copy(Map to, Map from, Object keys[])
copy

if (from == null || keys == null)
 return to;
if (to == null)
 to = new HashMap();
for (int i = 0; i < keys.length; i++)
 to.put(keys[i], from.get(keys[i]));
return to;

Map copy(Map src, Map propertyRef)
copy

Map<Object, Object> dst = new HashMap<Object, Object>();
Set<?> entrySet = src.entrySet();
for (Object object : entrySet) {
 if (object != null && object instanceof Entry<?, ?>) {
 Entry<?, ?> entry = (Entry<?, ?>) object;
 Object key = entry.getKey();
 Object value = entry.getValue();
 if (key != null) {
...

Map> copy(Map> original)
copy

Map<K, List<E>> copy = new HashMap<K, List<E>>();
for (Entry<K, List<E>> entry : original.entrySet()) {
 copy.put(entry.getKey(), new ArrayList<E>(entry.getValue()));
return copy;

Map copy(Map map)
copy

Map<K, V> copy = new HashMap<>();
for (K key : map.keySet()) {
 copy.put(key, map.get(key));
return copy;

void copy(Map master, Map copy)
copy

copy.clear();
merge(master, copy);

Map> copy(Map> original)
copy

Map<String, Map<String, String>> copy = new HashMap<>();
if (original != null) {
 for (String key : original.keySet()) {
 copy.put(key, new HashMap<>(original.get(key)));
return copy;

void copy(Map src, Map dst)
copy

for (Entry<T, K> e : src.entrySet()) {
 dst.put(e.getKey(), e.getValue());