importjava.util.Set;importcom.google.common.collect.Sets;publicclassExample{publicstaticvoidmain(String[]args){Set<String>set=createAndInitializeHashSet();System.out.println(set);}publicstaticSet<String>createAndInitializeHashSet(){Set<String>set=Sets.newHashSet();set.add("元素1");set.add("元素...
以及// 把链表转为红黑树/*** Replaces all linked nodes in bin at index for given hash unless * table is too small, in which case resizes instead.*/finalvoidtreeifyBin(Node<K,V>[] tab,inthash) {intn, index; Node<K,V>e;if(tab ==null|| (n = tab.length) <MIN_TREEIFY_CAPACITY...
Sets the Handle property. (Inherited from Object) Size() Returns the number of elements in this set (its cardinality). Spliterator() Creates a late-binding and fail-fast Spliterator over the elements in this set. ToArray() To be added (Inherited from AbstractCollection) ToArray...
ConcurrentHashMap的 key 和 value 不能为 null 主要是为了避免二义性。null 是一个特殊的值，表示没...
在Java语言中,给ConcurrentHashMap和Hashtable这些线程安全的集合中的Key或者Value插入 null(空) 值的会报空指针异常,但是单线程操作的HashMap又允许 Key 或者 Value 插入 null(空) 值。这到底是为什么呢? 1、探寻源码 为了找到原因,我们先来看这样一段源码片段,打开ConcurrentHashMap的putVal()方法,源码中第一句就...
* always collide. (Among known examples are sets of Float keys * holding consecutive whole numbers in small tables.) So we * apply a transform that spreads the impact of higher bits * downward. There is a tradeoff between speed, utility, and ...
* holding consecutive whole numbers in small tables.) So we * apply a transform that spreads the impact of higher bits * downward. There is a tradeoff between speed, utility, and * quality of bit-spreading. Because many common sets of hashes ...
在Java中,有很多地方都使用了MurmurHash,比如Guava包、Jedis包,Cassandra包中都有这种hash算法。 MurmurHash算法总结:高运算性能,低碰撞率。 packagecom.wuxiaolong.EncrypteDecrypt;importcom.google.common.base.Charsets;importcom.google.common.base.Stopwatch;importcom.google.common.collect.Sets;importcom.google...
$ javac MinHash.java $ java MinHash Set1 : [SAN, MISSION, FRANCISCO] Set2 : [SAN, USA, MISSION, FRANCISCO] Similarity between two sets: 1.0 Sanfoundry Global Education & Learning Series – 1000 Java Programs. advertisement Here’s the list of Best Books in Java Programming, Data Structur...
* number of keys in this map reaches its threshold. * * If current capacity is MAXIMUM_CAPACITY, this method does not * resize the map, but sets threshold to Integer.MAX_VALUE. * This has the effect of preventing future calls.