负载因子(load factor),它用来衡量哈希表的 空/满 程度,一定程度上也可以体现查询的效率,计算公式为: The ratio of the number of elements in the hash table to the table size iscalled the load factor. Studies have shown that hash table performance is bestwhen the load factor is 1.0, or when the…
大部分思路都是一样的 .仅仅是一些细节不一样.源代码中都标了出来.jdk容器源代码还是挺简单的. public class HashMap<K,V> extends AbstractMap<K,V> implements Map<K,V>, Cloneable, Serializable { //容量默认值 static final int DEFAULT_INITIAL_CAPACITY = 16; //最大容量 static final int MAXIMUM_CA…
Sole purpose of using concurrency is to produce scalable and faster program. But always remember, speed comes after correctness. Your Java program must follow its invariant in all conditions, which it would, if executed in sequential manner. If you a…
使用非默认内核而出现的错误. [zsj@arch ~]$ systemctl --state=failed UNIT LOAD ACTIVE SUB DESCRIPTION● systemd-modules-load.service loaded failed failed Load Kernel ModulesLOAD = Reflects whether the unit definition was properly loaded.ACTIVE = The high-level unit…
先附源码: package java.util; import java.io.*; /** * This class implements a hash table, which maps keys to values. Any * non-<code>null</code> object can be used as a key or as a value. <p> * * To successfully store and retrieve objects fro…