Java Utililty Methods Map Copy

List of utility methods to do Map Copy

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Description

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

Method

MapcopyOptions(Map options)
copy Options 
return options != null ? new HashMap<String, Object>(options) : new HashMap<String, Object>();
MapcopyParameters(Map parameters)
copy Parameters 
Map<String, Object> ps = new HashMap<>();
if (parameters != null)
    ps.putAll(parameters);
return ps;
voidcopyPropertiesToMap(Properties source, Map target)
This function copies all mappings from source properties to target map. 
if (source != null) {
    Iterator<Entry<Object, Object>> iterator = source.entrySet().iterator();
    Entry<Object, Object> entry = null;
    String key = null;
    String value = null;
    while (iterator.hasNext()) {
        entry = iterator.next();
        key = (String) entry.getKey();
...
java.util.MapcopySafelyToObjectToObjectMap(java.util.Map map)
copy Safely To Object To Object Map 
java.util.Map<Object, Object> castedCopy = new java.util.LinkedHashMap<Object, Object>();
if (map == null) {
    return castedCopy;
java.util.Iterator<?> it = map.keySet().iterator();
while (it.hasNext()) {
    Object nextKey = it.next();
    castedCopy.put(nextKey, map.get(nextKey));
...
MapcopyStringMap(Map initParams)
copy String Map 
return new HashMap<String, String>(initParams);
voidcopyUntilFull(final Map source, final Map dest1, Map overflow, final int dest1Capacity)
Copies the entries from source to dest1 until dest1 has reached size dest1Capacity. 
for (final Map.Entry<? extends T, ? extends U> srcEntry : source.entrySet()) {
    if (dest1.size() < dest1Capacity) {
        dest1.put(srcEntry.getKey(), srcEntry.getValue());
    } else {
        overflow.put(srcEntry.getKey(), srcEntry.getValue());
voidcopyValue(Map source, Map target, K key)
Copy value. 
target.put(key, source.get(key));
booleancopyValueIfExist(Map source, K sourceKey, Map target, K targetKey)
Copy value if it exists (is not null) from the source map. 
V v = source.get(sourceKey);
if (v != null) {
    target.put(targetKey, v);
    return true;
return false;
booleancopyValueIfExist(Map source, Map target, K key)
Copy value from the source map to the target map only if the value exists in the source map. 
V v = source.get(key);
if (v != null) {
    target.put(key, v);
    return true;
return false;
MapdeepCopy(Map map)
deep Copy 
Map result = new HashMap();
for (Object o : map.keySet()) {
    result.put(o, map.get(o));
result = Collections.unmodifiableMap(result);
return result;