Java Utililty Methods ConcurrentHashMap

List of utility methods to do ConcurrentHashMap

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Description

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

Method

ConcurrentHashMapcreateConcurrentHashMap()
create Concurrent Hash Map 
return new ConcurrentHashMap<K, V>();
ConcurrentHashMapcreateConcurrentHashMap()
Creates a concurrent map with lesser segements to save memory. 
return createConcurrentHashMap(16);
MapgetConcurrentHashMap()
get Concurrent Hash Map 
return Collections.synchronizedMap(new ConcurrentHashMap<K, V>());
doublegetDoubleSafe(ConcurrentHashMap map, String key)
get Double Safe 
Double v = map.get(key);
if (v == null)
    return 0.0;
else
    return v;
ConcurrentHashMapgetMapSafe( ConcurrentHashMap> map, String key)
get Map Safe 
ConcurrentHashMap<String, Double> map2 = map.get(key);
if (map2 == null) {
    map2 = new ConcurrentHashMap<String, Double>();
    map.put(key, map2);
return map2;
Map.Entrymax(ConcurrentHashMap map)
max 
return map.reduceEntries(10, (e1, e2) -> {
    return e1.getValue() > e2.getValue() ? e1 : e2;
});
voidParseKeyValString(String keyValString, ConcurrentHashMap map)
Parse Key Val String 
if (!keyValString.startsWith("#") && !keyValString.startsWith("//") && !keyValString.startsWith("
    for (i = 0; i < keyValString.length(); ++i) {
        char cur = keyValString.charAt(i);
        if (cur == ' ' || cur == '\t' || cur == '=') {
            i++;
            break;
        sb.append(cur);
...
voidparseMap(String config, ConcurrentHashMap map)
parse Map 
StringTokenizer tupleTokenizer = new StringTokenizer(config, "/");
while (tupleTokenizer.hasMoreTokens()) {
    String tuple = tupleTokenizer.nextToken();
    StringTokenizer commaTokenizer = new StringTokenizer(tuple, ",");
    if (commaTokenizer.countTokens() != 2) {
        throw new Exception("parsing Map, wrong format!");
    String key = commaTokenizer.nextToken();
...
VputIfAbsent(ConcurrentHashMap col, K key, V val)
put If Absent 
if (col.containsKey(key) == false) {
    col.put(key, val);
return col.get(key);
voidsetFieldValue(Object value, ConcurrentHashMap fieldHolder, String name, String desc)
set Field Value 
fieldHolder.put(getFieldKey(name, desc), value);