Java的HashMap和HashTable 1. HashMap 1) hashmap的数据结构 Hashmap是一个数组和链表的结合体(在数据结构称“链表散列“),如下图示: 当我们往hashmap中put元素的时候,先根据key的hash值得到这个元素在数组中的位置(即下标),然后就可以把这个元素放到对应的位置中了。如果这个元素所在的位子上已经存放有其他元素...
getValue()); } } } private static final long serialVersionUID = 362498820763181265L; /** * Reconstitute the {@code HashMap} instance from a stream (i.e., * deserialize it). */ private void readObject(java.io.ObjectInputStream s) throws IOException, ClassNotFoundException { // Read in...
View Code size的解释是The number of key-value mappings contained in this map. 而threshold已经解释过了。也就是说put时会对元素数量进行检查,并视情况进行扩容。
[3]Hidden Features of Java http://stackoverflow.com/questions/15496/hidden-features-of-java [4]Java 大括号语法糖 http://my.oschina.net/trydofor/blog/79222 [5]Java 7 的新特性:http://code.joejag.com/2009/new-language-features-in-java-7/ http://www.iteye.com/news/11490-java-7...
描述文档: /** * Hash table based implementation of the {@code Map} interface. This * implementation provides all of the optional map operations, and permi
https://www.cdn.geeksforgeeks.org/java-util-hashmap-in-java/ https://www.javacodegeeks.com/2017/11/java-hashmap-detail-explanation.html http://blog.csdn.net/zxt0601/article/details/77413921 http://lingmeng.github.io/archives/
This attribute can be of great advantage in an API that receives any map, makes a copy to manipulate and returns it to the calling code. If the client needs the returned map to be ordered the same way before calling the API, then a linked hashmap is the way to go. ...
This class is a member of theJava Collections Framework. Added in 1.2. Java documentation forjava.util.HashMap. Portions of this page are modifications based on work created and shared by theAndroid Open Source Projectand used according to terms described in theCreative Commons 2.5 Attribution Lic...
text/java复制 {@code void foo(Map<String, Integer> m) { Map<String, Integer> copy = new LinkedHashMap<>(m); ... } } This technique is particularly useful if a module takes a map on input, copies it, and later returns results whose order is determined by that of the copy. (Clie...
/*** Returns index for hash code h.*/static int indexFor(int h, int length) {return h & (length-1);} 计算相当简洁:将table的容量与hash值做“与”运算,得到哈希table的bucket下标。 ③ 拓展 这种通俗的不能再通俗的计算大家都能看懂,但为何要这样做呢?背后的思考是什么?在看到下面的解释前,大家...