Because TreeNodes are about twice the size of regular nodes, we use them only when bins contain enough nodes to warrant use (see TREEIFY_THRESHOLD). And when they become too small (due to removal or resizing) they are converted back to plain bins. In usages with well-distributed user has...
3 return putForNullKey(value); 4 int hash = hash(key.hashCode()); 5 int i = indexFor(hash, table.length); 6 for (Entry<K,V> e = table[i]; e != null; e = e.next) { 7 Object k; 8 if (e.hash == hash && ((k = e.key) == key || key.equals(k))) { 9 V ol...
此处我们的键值类型是Dog,而两个Dog对象是否相同,其实是取决于Dog对象的equals()方法和hashCode()方法。对于自定义的类型而言,其默认的equals()方法和hashCode()方法来源与Java中的超级父类java.lang.Object,它们都是只在两个对象引用是同一个对象时,才返回true值。但是,对于Dog对象,我们希望当它们的color一样时,...
* Applies a supplemental hash function to a given hashCode, which defends * against poor quality hash functions. This is critical because * ConcurrentHashMap uses power-of-two length hash tables, that otherwise * encounter collisions for hashCodes that do not differ in lower or upper * bits. ...
inthash =hash(key.hashCode());inti =indexFor(hash, table.length);for(Entry<K,V> e = table[i]; e !=null; e = e.next) {Objectk;// 若key对已经存在,则用新的value取代旧的valueif(e.hash== hash && ((k = e.key) ==key||key.equals(k))) {...
// ... hashcode, equals, getters methods are omitted ... } As the code shows,thePlayerclass doesn’t implementComparable.Now, let’s initialize aLinkedHashMap<String, Player>: static LinkedHashMap<String, Player> PLAYERS = new LinkedHashMap<>(); ...
Methods inherited from interface java.util.Map compute,computeIfAbsent,computeIfPresent,containsKey,equals,hashCode,isEmpty,merge,put,putAll,putIfAbsent,remove,remove,replace,replace,size Constructor Detail LinkedHashMap public LinkedHashMap(int initialCapacity, float loadFactor) ...
And when they become too small (due to removal or resizing) they are converted back to plain bins. In usages with well-distributed user hashCodes, tree bins are rarely used. 大致的意思是 TreeNode 对象的大小约是普通 Node 对象的2倍,我们仅在桶(bin)中包含足够多的节点时再使用。当桶中的...
Object finalize, getClass, notify, notifyAll, wait, wait, wait Methods declared in interface java.util.Map compute, computeIfAbsent, computeIfPresent, containsKey, equals, forEach, getOrDefault, hashCode, isEmpty, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, ...
publicclassBook{privateInteger bookId;privateString title;privateString author;//getters, setters, constructors, equals and hashcode omitted}Copy Suppose we have thebooks.jsonfile consisting of a JSON array that contains three books: [{"bookId":1,"title":"A Song of Ice and Fire","author":...