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

Mapmap(Map accumulator, Key key, Value value)
Adds a entry to a map namely (key,value). 
accumulator.put(key, value);
return accumulator;
Stringmap(Map outcomeMapping, String line, int firstTabIdx)
map 
String s = line.substring(0, firstTabIdx);
Integer integer = outcomeMapping.get(s);
if (integer == null) {
    return s;
return integer.toString();
Mapmap(Object key, Object value)
map 
Map map = new HashMap();
map.put(key, value);
return map;
Mapmap(Object obj)
Readability method for casting. 
return (Map<String, Object>) obj;
Mapmap(Object... args)
map 
if (args.length % 2 != 0)
    throw new IllegalArgumentException("Length of arguments must be a multiple of 2");
else if (args.length == 0)
    return Collections.emptyMap();
Map<K, V> ret = new HashMap<>(args.length / 2);
for (int idx = 0; idx < args.length; idx += 2) {
    ret.put((K) args[idx], (V) args[idx + 1]);
return ret;
Mapmap(Object... data)
map 
Map<K, V> map = new HashMap<K, V>(data.length + 2);
for (int i = 1; i < data.length; i += 2) {
    map.put((K) data[i - 1], (V) data[i]);
return map;
Mapmap(Object... data)
This is useful to create a map of object in declarative way. 
Map<K, V> map = new HashMap<K, V>(data.length + 2);
for (int i = 1; i < data.length; i += 2) {
    map.put((K) data[i - 1], (V) data[i]);
return map;