Java Utililty Methods Map from Array

List of utility methods to do Map from Array

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Map from Array

Description

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

Method

Map map(Object... elements)
Create a map from any number of paris of arguments.

if (elements.length % 2 == 1) {
 throw new IllegalArgumentException("map() requires an even number of arguments");
Map m = map();
for (int ix = 0; ix < elements.length;) {
 m.put(elements[ix++], elements[ix++]);
return m;
...

Map map(Object... keyvals)
map

if (keyvals == null) {
 return new HashMap<>();
} else if (keyvals.length % 2 != 0) {
 throw new IllegalArgumentException("Map must have an even number of elements");
} else {
 Map<K, V> m = new HashMap<>(keyvals.length / 2);
 for (int i = 0; i < keyvals.length; i += 2) {
 m.put((K) keyvals[i], (V) keyvals[i + 1]);
...

Map map(Object... mapValues)
map

Map map = new HashMap();
for (int i = 0; i < mapValues.length; i = i + 2) {
 map.put(mapValues[i], mapValues[i + 1]);
return map;

Map map(Object... objects)
map

if (objects.length % 2 != 0) {
 throw new RuntimeException("bad argument list " + objects.length + ": " + Arrays.toString(objects));
HashMap<String, Object> m = new HashMap<>();
for (int i = 0; i < objects.length; i += 2) {
 m.put((String) objects[i], objects[i + 1]);
return m;
...

Map map(Object... objects)
map

HashMap map = new HashMap();
Object key = null;
for (final Object object : objects) {
 if (key == null) {
 key = object;
 } else {
 map.put(key, object);
 key = null;
...

Map map(Object... objects)
A short-hand method for creating a Map of key/value pairs where keys are String s and values are Object s.

return genericMap(objects);

Map map(Object... objs)
map

return toMap(objs);

Map map(Object... objs)
map

if (objs.length % 2 != 0) {
 throw new IllegalArgumentException("Input map should contain even count of arguments.");
Map<String, Object> map = new LinkedHashMap<>();
for (int i = 0; i < objs.length; i += 2) {
 map.put((String) objs[i], objs[i + 1]);
return map;
...

Map map(Object... oo)
map

Map result = new HashMap();
for (int i = 0; i < oo.length; i += 2)
 result.put(oo[i], oo[i + 1]);
return result;

Map map(Object... params)
map

HashMap map = new HashMap();
for (int i = 0; i < params.length; i += 2) {
 map.put(params[i], params[i + 1]);
return map;