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()
create Map 
return new HashMap<K, V>();
MapcreateMap(boolean full)
create Map 
final Map<String, Object> map = new HashMap<>();
map.put("mongoUri", URI);
map.put("database", DB);
if (full) {
    map.put("collection", COLL);
    map.put("batchSize", BATCH_SIZE);
    map.put("batchTimeMs", BATCH_TIME);
return map;
MapcreateMap(int len)
create Map 
if (len < 1) {
    return new HashMap();
return new HashMap(len);
MapcreateMap(Iterable> entries)
Initialize a map using a variable number of Entry objects as input 
Map<K, V> map = new HashMap<K, V>();
for (Entry<K, V> entry : entries)
    map.put(entry.getKey(), entry.getValue());
return map;
MapcreateMap(K k1, V v1)
create Map 
Map<K, V> m = new HashMap<>();
m.put(k1, v1);
return Collections.unmodifiableMap(m);
MapcreateMap(K[] keys, V[] values)
create Map 
assert keys.length == values.length : "Lengths of keys and values should be the same";
Map<K, V> res = new HashMap<>(keys.length);
for (int i = 0; i < keys.length; i++)
    res.put(keys[i], values[i]);
return res;
MapcreateMap(List keys, List values)
create Map 
Map<A, B> map = new HashMap<A, B>();
for (int i = 0; i < keys.size(); i++) {
    if (i == values.size()) {
        break;
    map.put(keys.get(i), values.get(i));
return map;
...
MapcreateMap(List keys, List values)
Create a Map from a List of keys and a List of values 
if (keys == null || values == null || keys.size() != values.size()) {
    throw new IllegalArgumentException("Keys and Values cannot be null and must be the same size");
Map<Object, Object> newMap = new HashMap<Object, Object>();
for (int i = 0; i < keys.size(); i++) {
    newMap.put(keys.get(i), values.get(i));
return newMap;
...
MapcreateMap(Map map)
create Map 
if (map == null) {
    return null;
Map<K, V> result = new HashMap<K, V>();
result.putAll(map);
return result;
MapcreateMap(Object keys[], Object values[])
create Map 
Map map = new HashMap();
if (keys.length != values.length)
    return map;
for (int i = 0; i < keys.length; i++)
    map.put(keys[i], values[i]);
return map;