Java Utililty Methods Map Create

List of utility methods to do Map Create

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Description

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

Method

MapcreateMap(Object... args)
Helper function to create maps easier. 
assert args.length % 2 == 0;
Map<Object, Object> result = new HashMap<Object, Object>();
for (int i = 0; i < args.length; i += 2) {
    result.put(args[i], args[i + 1]);
return result;
MapcreateMap(Object... objects)
Create Map filled with values. 
Map<T, X> map = new HashMap<>();
for (int i = 0; i < objects.length; i++) {
    map.put((T) objects[i], (X) objects[++i]);
return map;
MapcreateMap(Object... objects)
create Map 
if (isEmpty(objects)) {
    return Collections.emptyMap();
if (objects.length % 2 != 0) {
    throw new IllegalArgumentException("objects should be even");
Map<K, V> map = new HashMap<>();
for (int i = 0; i < objects.length; i++) {
...
MapcreateMap(Object[] keysValues)
create Map 
Map ret = new HashMap();
for (int i = 0; i < keysValues.length; i = i + 2) {
    ret.put(keysValues[i], keysValues[i + 1]);
return ret;
MapcreateMap(String entries)
create Map 
return fillMap(new HashMap<String, String>(), entries);
MapcreateMap(String key, Object value)
create Map 
return createMap(new String[] { key }, new Object[] { value });
MapcreateMap(String[] list1, String[] list2)
Create a map from the two list of strings. 
final Map<String, String> ret = new HashMap<String, String>(list1.length);
for (int i = 0; i < list1.length; i++) {
    ret.put(list1[i].trim(), list2[i].trim());
return ret;
MapcreateMap(String[] mappings, String sep)
Create map from string description. 
Map<String, String> dict = new HashMap<>();
for (String m : mappings) {
    String[] parts = m.split(sep, 2);
    if (parts.length == 1) {
        dict.put(m, m);
    } else {
        dict.put(parts[0], parts[1]);
return dict;
MapcreateMap(T... _args)
Creates a map from the even-sized parameter array. 
Map<T, T> map = new HashMap<>();
if (_args != null) {
    if (_args.length % 2 != 0) {
        throw new IllegalArgumentException(
                "Even number of parameters required to create map: " + Arrays.toString(_args));
    for (int i = 0; i < _args.length;) {
        map.put(_args[i], _args[i + 1]);
...
MapcreateMap(U... items)
create Map 
Map<U, U> result = new HashMap<U, U>();
for (U item : items) {
    result.put(item, item);
return result;