{"id":41729,"date":"2025-06-04T03:23:48","date_gmt":"2025-06-03T19:23:48","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/41729.html"},"modified":"2025-06-04T03:23:48","modified_gmt":"2025-06-03T19:23:48","slug":"%e6%89%8b%e5%86%99hashmap","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/41729.html","title":{"rendered":"\u624b\u5199HashMap"},"content":{"rendered":"

\u9879\u76ee\u4ed3\u5e93：https:\/\/gitee.com\/bossDuy\/hand-tear-collection-series \u57fa\u4e8e\u4e00\u4e2ab\u7ad9up\u7684\u8bfe\u7a0b：https:\/\/www.bilibili.com\/video\/BV1SWZrYDEag?spm_id_from=333.788.videopod.sections&vd_source=4cda4baec795c32b16ddd661bb9ce865<\/p>\n

\u624b\u5199\u7b80\u5355\u7684HashMap<\/h2>\n

\u8fd9\u91cc\u5b9e\u73b0\u7684\u662fjdk1.7\u7684，\u6ca1\u6709\u5b9e\u73b0\u7ea2\u9ed1\u6811<\/p>\n

\u7b80\u5355\u7684\u5b9e\u73b0<\/h3>\n

\u5e76\u6ca1\u5bf9\u6876\u6570\u7ec4\u8fdb\u884c\u6269\u5bb9<\/p>\n

package<\/span> com.<\/span>yb0os1<\/span>;<\/span><\/p>\n

import<\/span> org.<\/span>w3c.<\/span>dom.<\/span><\/span>Node<\/span><\/span>;<\/span><\/p>\n

public<\/span> class<\/span> MyHashMap<\/span><<\/span>K<\/span>,<\/span> V<\/span>><\/span><\/span> {<\/span>
\n \/\/\u9ed8\u8ba4\u7684\u521d\u59cb\u5bb9\u91cf<\/span>
\n private<\/span> static<\/span> final<\/span> int<\/span> DEFAULT_INITIAL_CAPACITY<\/span> =<\/span> 16<\/span>;<\/span>
\n \/\/\u9ed8\u8ba4\u7684\u8d1f\u8f7d\u56e0\u5b50<\/span>
\n private<\/span> static<\/span> final<\/span> float<\/span> DEFAULT_LOAD_FACTOR<\/span> =<\/span> 0.75f<\/span>;<\/span>
\n \/\/\u5f53\u524dHashMap\u7684\u5927\u5c0f<\/span>
\n private<\/span> int<\/span> size;<\/span><\/p>\n

\/\/\u5b58\u50a8Node\u7684\u6570\u7ec4<\/span>
\n private<\/span> Node<\/span><<\/span>K<\/span>,<\/span> V<\/span>><\/span><\/span>[<\/span>]<\/span> table;<\/span>
\n \/\/\u8d1f\u8f7d\u56e0\u5b50<\/span>
\n private<\/span> float<\/span> loadFactor;<\/span><\/p>\n

public<\/span> MyHashMap<\/span>(<\/span>)<\/span> {<\/span>
\n this<\/span>.<\/span>size =<\/span> 0<\/span>;<\/span>
\n this<\/span>.<\/span>table =<\/span> new<\/span> Node<\/span>[<\/span>DEFAULT_INITIAL_CAPACITY<\/span>]<\/span>;<\/span>
\n this<\/span>.<\/span>loadFactor =<\/span> DEFAULT_LOAD_FACTOR<\/span>;<\/span>
\n }<\/span><\/p>\n

public<\/span> V<\/span> put<\/span>(<\/span>K<\/span> key,<\/span> V<\/span> value)<\/span> {<\/span>
\n \/\/put\u7684\u65f6\u5019，\u9996\u5148\u83b7\u53d6key\u7684hashcode\u8ba1\u7b97\u5bf9\u5e94\u7684indexOf<\/span>
\n int<\/span> index =<\/span> indexOf<\/span>(<\/span>key)<\/span>;<\/span>
\n Node<\/span><<\/span>K<\/span>,<\/span> V<\/span>><\/span><\/span> head =<\/span> table[<\/span>index]<\/span>;<\/span>
\n \/\/\u5224\u65ad\u6570\u7ec4\u5f53\u524dindex\u662f\u5426\u4e3a\u7a7a<\/span>
\n if<\/span> (<\/span>head ==<\/span> null<\/span>)<\/span> {<\/span>\/\/\u4e3a\u7a7a<\/span>
\n table[<\/span>index]<\/span> =<\/span> new<\/span> Node<\/span><<\/span>><\/span><\/span>(<\/span>key,<\/span> value)<\/span>;<\/span>
\n size++<\/span>;<\/span>
\n return<\/span> null<\/span>;<\/span>
\n }<\/span>
\n \/\/\u5f53\u524d\u6570\u7ec4\u4e0b\u6807\u4f4d\u7f6e\u4e0d\u4e3a\u7a7a<\/span>
\n while<\/span> (<\/span>true<\/span>)<\/span> {<\/span>
\n \/\/\u5f53\u524d\u4f4d\u7f6ekey\u548c\u4f20\u5165\u7684key\u76f8\u540c，\u66ff\u6362value<\/span>
\n if<\/span> (<\/span>head.<\/span>key.<\/span>equals<\/span>(<\/span>key)<\/span>)<\/span> {<\/span>
\n V<\/span> oldValue =<\/span> head.<\/span>value;<\/span>
\n head.<\/span>value =<\/span> value;<\/span>
\n return<\/span> oldValue;<\/span>
\n }<\/span>
\n \/\/\u5f53\u524d\u4f4d\u7f6ekey\u548c\u4f20\u5165\u7684key\u4e0d\u76f8\u540c，\u5148\u5224\u65ad\u662f\u5426\u5230\u94fe\u8868\u5c3e\u90e8<\/span>
\n if<\/span> (<\/span>head.<\/span>next ==<\/span> null<\/span>)<\/span> {<\/span>
\n head.<\/span>next =<\/span> new<\/span> Node<\/span><<\/span>><\/span><\/span>(<\/span>key,<\/span> value)<\/span>;<\/span>
\n size++<\/span>;<\/span>
\n return<\/span> null<\/span>;<\/span>
\n }<\/span>
\n \/\/\u7ee7\u7eed\u904d\u5386\u4e0b\u4e00\u4e2a\u8282\u70b9<\/span>
\n head =<\/span> head.<\/span>next;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

public<\/span> V<\/span> get<\/span>(<\/span>K<\/span> key)<\/span> {<\/span>
\n \/\/get\u7684\u65f6\u5019，\u9996\u5148\u83b7\u53d6key\u7684hashcode\u8ba1\u7b97\u5bf9\u5e94\u7684indexOf<\/span>
\n int<\/span> index =<\/span> indexOf<\/span>(<\/span>key)<\/span>;<\/span>
\n Node<\/span><<\/span>K<\/span>,<\/span> V<\/span>><\/span><\/span> head =<\/span> table[<\/span>index]<\/span>;<\/span>
\n \/\/\u5224\u65ad\u6570\u7ec4\u5f53\u524dindex\u662f\u5426\u4e3a\u7a7a<\/span>
\n while<\/span> (<\/span>head !=<\/span> null<\/span>)<\/span>{<\/span>
\n if<\/span>(<\/span>head.<\/span>key.<\/span>equals<\/span>(<\/span>key)<\/span>)<\/span>{<\/span>
\n return<\/span> head.<\/span>value;<\/span>
\n }<\/span>
\n head =<\/span> head.<\/span>next;<\/span>
\n }<\/span>
\n return<\/span> null<\/span>;<\/span>
\n }<\/span><\/p>\n

public<\/span> V<\/span> remove<\/span>(<\/span>K<\/span> key)<\/span> {<\/span>
\n \/\/remove\u7684\u65f6\u5019，\u9996\u5148\u83b7\u53d6key\u7684hashcode\u8ba1\u7b97\u5bf9\u5e94\u7684indexOf<\/span>
\n int<\/span> index =<\/span> indexOf<\/span>(<\/span>key)<\/span>;<\/span>
\n Node<\/span><<\/span>K<\/span>,<\/span>V<\/span>><\/span><\/span> head =<\/span> table[<\/span>index]<\/span>;<\/span>
\n \/\/\u8981\u5224\u65ad\u662f\u5426\u4e3a\u5934\u8282\u70b9<\/span>
\n \/\/\u662f\u5934\u8282\u70b9<\/span>
\n if<\/span>(<\/span>head!=<\/span>null<\/span>&&<\/span>head.<\/span>key.<\/span>equals<\/span>(<\/span>key)<\/span>)<\/span>{<\/span>
\n table[<\/span>index]<\/span> =<\/span> head.<\/span>next;<\/span>
\n —<\/span>size;<\/span>
\n return<\/span> head.<\/span>value;<\/span>
\n }<\/span>
\n \/\/\u4e0d\u4e3a\u5934\u8282\u70b9<\/span>
\n Node<\/span><<\/span>K<\/span>,<\/span>V<\/span>><\/span><\/span> pre =<\/span> head;<\/span>
\n Node<\/span><<\/span>K<\/span>,<\/span>V<\/span>><\/span><\/span> cur =<\/span> head.<\/span>next;<\/span>
\n while<\/span>(<\/span>cur!=<\/span>null<\/span>)<\/span>{<\/span>
\n if<\/span>(<\/span>cur.<\/span>key.<\/span>equals<\/span>(<\/span>key)<\/span>)<\/span>{<\/span>
\n pre.<\/span>next=<\/span>cur.<\/span>next;<\/span>
\n —<\/span>size;<\/span>
\n return<\/span> cur.<\/span>value;<\/span>
\n }<\/span>
\n pre =<\/span> cur;<\/span>
\n cur =<\/span> cur.<\/span>next;<\/span>
\n }<\/span>
\n return<\/span> null<\/span>;<\/span>
\n }<\/span>
\n public<\/span> int<\/span> size<\/span>(<\/span>)<\/span>{<\/span>
\n return<\/span> size;<\/span>
\n }<\/span>
\n private<\/span> int<\/span> indexOf<\/span>(<\/span>Object<\/span> key)<\/span> {<\/span>
\n return<\/span> key.<\/span>hashCode<\/span>(<\/span>)<\/span> &<\/span> (<\/span>table.<\/span>length –<\/span> 1<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

\/\/hashmap\u91cc\u9762\u7684\u8282\u70b9 entry<\/span>
\n private<\/span> class<\/span> Node<\/span><<\/span>K<\/span>,<\/span> V<\/span>><\/span><\/span> {<\/span>
\n public<\/span> Node<\/span>(<\/span>)<\/span> {<\/span><\/p>\n

}<\/span><\/p>\n

public<\/span> Node<\/span>(<\/span>K<\/span> key,<\/span> V<\/span> value)<\/span> {<\/span>
\n this<\/span>.<\/span>key =<\/span> key;<\/span>
\n this<\/span>.<\/span>value =<\/span> value;<\/span>
\n }<\/span><\/p>\n

public<\/span> K<\/span> key;<\/span>
\n public<\/span> V<\/span> value;<\/span>
\n public<\/span> Node<\/span><<\/span>K<\/span>,<\/span>V<\/span>><\/span><\/span> next;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\u6211\u4eec\u8fdb\u884c\u6d4b\u8bd5<\/p>\n

@org.junit.Test<\/span>
\n public<\/span> void<\/span> test<\/span>(<\/span>)<\/span> {<\/span>
\n MyHashMap<\/span><<\/span>String<\/span>,<\/span>String<\/span>><\/span><\/span> myHashMap =<\/span> new<\/span> MyHashMap<\/span>(<\/span>)<\/span>;<\/span>
\n int<\/span> count =<\/span> 100000<\/span>;<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> count;<\/span> i++<\/span>)<\/span> {<\/span>
\n myHashMap.<\/span>put<\/span>(<\/span>String<\/span>.<\/span>valueOf<\/span>(<\/span>i)<\/span>,<\/span> String<\/span>.<\/span>valueOf<\/span>(<\/span>i)<\/span>)<\/span>;<\/span>
\n }<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>myHashMap.<\/span>size<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> count;<\/span> i++<\/span>)<\/span> {<\/span>
\n assertEquals<\/span>(<\/span>String<\/span>.<\/span>valueOf<\/span>(<\/span>i)<\/span>,<\/span>myHashMap.<\/span>get<\/span>(<\/span>String<\/span>.<\/span>valueOf<\/span>(<\/span>i)<\/span>)<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

\u6876\u6570\u7ec4\u6269\u5bb9\u7248\u672c<\/h3>\n

\u589e\u52a0\u4e86\u6876\u6570\u7ec4\u6269\u5bb9<\/p>\n

package<\/span> com.<\/span>yb0os1<\/span>;<\/span><\/p>\n

import<\/span> org.<\/span>w3c.<\/span>dom.<\/span><\/span>Node<\/span><\/span>;<\/span><\/p>\n

public<\/span> class<\/span> MyHashMap<\/span><<\/span>K<\/span>,<\/span> V<\/span>><\/span><\/span> {<\/span>
\n \/\/\u9ed8\u8ba4\u7684\u521d\u59cb\u5bb9\u91cf<\/span>
\n private<\/span> static<\/span> final<\/span> int<\/span> DEFAULT_INITIAL_CAPACITY<\/span> =<\/span> 16<\/span>;<\/span>
\n \/\/\u9ed8\u8ba4\u7684\u8d1f\u8f7d\u56e0\u5b50<\/span>
\n private<\/span> static<\/span> final<\/span> float<\/span> DEFAULT_LOAD_FACTOR<\/span> =<\/span> 0.75f<\/span>;<\/span>
\n \/\/\u5f53\u524dHashMap\u7684\u5927\u5c0f<\/span>
\n private<\/span> int<\/span> size;<\/span><\/p>\n

\/\/\u5b58\u50a8Node\u7684\u6570\u7ec4<\/span>
\n private<\/span> Node<\/span><<\/span>K<\/span>,<\/span> V<\/span>><\/span><\/span>[<\/span>]<\/span> table;<\/span>
\n \/\/\u8d1f\u8f7d\u56e0\u5b50<\/span>
\n private<\/span> float<\/span> loadFactor;<\/span><\/p>\n

public<\/span> MyHashMap<\/span>(<\/span>)<\/span> {<\/span>
\n this<\/span>.<\/span>size =<\/span> 0<\/span>;<\/span>
\n this<\/span>.<\/span>table =<\/span> new<\/span> Node<\/span>[<\/span>DEFAULT_INITIAL_CAPACITY<\/span>]<\/span>;<\/span>
\n this<\/span>.<\/span>loadFactor =<\/span> DEFAULT_LOAD_FACTOR<\/span>;<\/span>
\n }<\/span><\/p>\n

public<\/span> V<\/span> put<\/span>(<\/span>K<\/span> key,<\/span> V<\/span> value)<\/span> {<\/span>
\n \/\/put\u7684\u65f6\u5019，\u9996\u5148\u83b7\u53d6key\u7684hashcode\u8ba1\u7b97\u5bf9\u5e94\u7684indexOf<\/span>
\n int<\/span> index =<\/span> indexOf<\/span>(<\/span>key)<\/span>;<\/span>
\n Node<\/span><<\/span>K<\/span>,<\/span> V<\/span>><\/span><\/span> head =<\/span> table[<\/span>index]<\/span>;<\/span>
\n \/\/\u5224\u65ad\u6570\u7ec4\u5f53\u524dindex\u662f\u5426\u4e3a\u7a7a<\/span>
\n if<\/span> (<\/span>head ==<\/span> null<\/span>)<\/span> {<\/span>\/\/\u4e3a\u7a7a<\/span>
\n table[<\/span>index]<\/span> =<\/span> new<\/span> Node<\/span><<\/span>><\/span><\/span>(<\/span>key,<\/span> value)<\/span>;<\/span>
\n size++<\/span>;<\/span>
\n resizeIfNecessary<\/span>(<\/span>)<\/span>;<\/span>
\n return<\/span> null<\/span>;<\/span>
\n }<\/span>
\n \/\/\u5f53\u524d\u6570\u7ec4\u4e0b\u6807\u4f4d\u7f6e\u4e0d\u4e3a\u7a7a<\/span>
\n while<\/span> (<\/span>true<\/span>)<\/span> {<\/span>
\n \/\/\u5f53\u524d\u4f4d\u7f6ekey\u548c\u4f20\u5165\u7684key\u76f8\u540c，\u66ff\u6362value<\/span>
\n if<\/span> (<\/span>head.<\/span>key.<\/span>equals<\/span>(<\/span>key)<\/span>)<\/span> {<\/span>
\n V<\/span> oldValue =<\/span> head.<\/span>value;<\/span>
\n head.<\/span>value =<\/span> value;<\/span>
\n return<\/span> oldValue;<\/span>
\n }<\/span>
\n \/\/\u5f53\u524d\u4f4d\u7f6ekey\u548c\u4f20\u5165\u7684key\u4e0d\u76f8\u540c，\u5148\u5224\u65ad\u662f\u5426\u5230\u94fe\u8868\u5c3e\u90e8<\/span>
\n if<\/span> (<\/span>head.<\/span>next ==<\/span> null<\/span>)<\/span> {<\/span>
\n head.<\/span>next =<\/span> new<\/span> Node<\/span><<\/span>><\/span><\/span>(<\/span>key,<\/span> value)<\/span>;<\/span>
\n size++<\/span>;<\/span>
\n resizeIfNecessary<\/span>(<\/span>)<\/span>;<\/span>
\n return<\/span> null<\/span>;<\/span>
\n }<\/span>
\n \/\/\u7ee7\u7eed\u904d\u5386\u4e0b\u4e00\u4e2a\u8282\u70b9<\/span>
\n head =<\/span> head.<\/span>next;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

public<\/span> V<\/span> get<\/span>(<\/span>K<\/span> key)<\/span> {<\/span>
\n \/\/get\u7684\u65f6\u5019，\u9996\u5148\u83b7\u53d6key\u7684hashcode\u8ba1\u7b97\u5bf9\u5e94\u7684indexOf<\/span>
\n int<\/span> index =<\/span> indexOf<\/span>(<\/span>key)<\/span>;<\/span>
\n Node<\/span><<\/span>K<\/span>,<\/span> V<\/span>><\/span><\/span> head =<\/span> table[<\/span>index]<\/span>;<\/span>
\n \/\/\u5224\u65ad\u6570\u7ec4\u5f53\u524dindex\u662f\u5426\u4e3a\u7a7a<\/span>
\n while<\/span> (<\/span>head !=<\/span> null<\/span>)<\/span>{<\/span>
\n if<\/span>(<\/span>head.<\/span>key.<\/span>equals<\/span>(<\/span>key)<\/span>)<\/span>{<\/span>
\n return<\/span> head.<\/span>value;<\/span>
\n }<\/span>
\n head =<\/span> head.<\/span>next;<\/span>
\n }<\/span>
\n return<\/span> null<\/span>;<\/span>
\n }<\/span><\/p>\n

public<\/span> V<\/span> remove<\/span>(<\/span>K<\/span> key)<\/span> {<\/span>
\n \/\/remove\u7684\u65f6\u5019，\u9996\u5148\u83b7\u53d6key\u7684hashcode\u8ba1\u7b97\u5bf9\u5e94\u7684indexOf<\/span>
\n int<\/span> index =<\/span> indexOf<\/span>(<\/span>key)<\/span>;<\/span>
\n Node<\/span><<\/span>K<\/span>,<\/span>V<\/span>><\/span><\/span> head =<\/span> table[<\/span>index]<\/span>;<\/span>
\n \/\/\u8981\u5224\u65ad\u662f\u5426\u4e3a\u5934\u8282\u70b9<\/span>
\n \/\/\u662f\u5934\u8282\u70b9<\/span>
\n if<\/span>(<\/span>head!=<\/span>null<\/span>&&<\/span>head.<\/span>key.<\/span>equals<\/span>(<\/span>key)<\/span>)<\/span>{<\/span>
\n table[<\/span>index]<\/span> =<\/span> head.<\/span>next;<\/span>
\n —<\/span>size;<\/span>
\n return<\/span> head.<\/span>value;<\/span>
\n }<\/span>
\n \/\/\u4e0d\u4e3a\u5934\u8282\u70b9<\/span>
\n Node<\/span><<\/span>K<\/span>,<\/span>V<\/span>><\/span><\/span> pre =<\/span> head;<\/span>
\n Node<\/span><<\/span>K<\/span>,<\/span>V<\/span>><\/span><\/span> cur =<\/span> head.<\/span>next;<\/span>
\n while<\/span>(<\/span>cur!=<\/span>null<\/span>)<\/span>{<\/span>
\n if<\/span>(<\/span>cur.<\/span>key.<\/span>equals<\/span>(<\/span>key)<\/span>)<\/span>{<\/span>
\n pre.<\/span>next=<\/span>cur.<\/span>next;<\/span>
\n —<\/span>size;<\/span>
\n return<\/span> cur.<\/span>value;<\/span>
\n }<\/span>
\n pre =<\/span> cur;<\/span>
\n cur =<\/span> cur.<\/span>next;<\/span>
\n }<\/span>
\n return<\/span> null<\/span>;<\/span>
\n }<\/span>
\n public<\/span> int<\/span> size<\/span>(<\/span>)<\/span>{<\/span>
\n return<\/span> size;<\/span>
\n }<\/span>
\n private<\/span> int<\/span> indexOf<\/span>(<\/span>Object<\/span> key)<\/span> {<\/span>
\n return<\/span> key.<\/span>hashCode<\/span>(<\/span>)<\/span> &<\/span> (<\/span>table.<\/span>length –<\/span> 1<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

private<\/span> void<\/span> resizeIfNecessary<\/span>(<\/span>)<\/span> {<\/span>
\n \/\/\u4e0d\u9700\u8981\u6269\u5bb9\u7684\u60c5\u51b5<\/span>
\n if<\/span>(<\/span>size<<\/span>table.<\/span>length*<\/span>loadFactor)<\/span>return<\/span>;<\/span>
\n \/\/\u9700\u8981\u6269\u5bb9\u7684\u60c5\u51b5 \u65b0\u5efa\u4e00\u4e2a\u65b0\u7684\u6876\u6570\u7ec4<\/span>
\n Node<\/span><<\/span>K<\/span>,<\/span>V<\/span>><\/span><\/span>[<\/span>]<\/span> newTable =<\/span> new<\/span> Node<\/span>[<\/span>table.<\/span>length*<\/span>2<\/span>]<\/span>;<\/span>
\n \/\/\u904d\u5386\u8001\u7684\u6876\u6570\u7ec4，\u5c06\u539f\u5148\u7684\u5143\u7d20\u518d\u54c8\u5e0c\u653e\u5230\u65b0\u7684\u6876\u6570\u7ec4<\/span>
\n for<\/span>(<\/span>Node<\/span><<\/span>K<\/span>,<\/span>V<\/span>><\/span><\/span> head:<\/span>table)<\/span>{<\/span>
\n if<\/span> (<\/span> head==<\/span>null<\/span>)<\/span>continue<\/span>;<\/span>
\n Node<\/span><<\/span>K<\/span>,<\/span>V<\/span>><\/span><\/span>current =<\/span> head;<\/span>
\n while<\/span>(<\/span>current!=<\/span>null<\/span>)<\/span>{<\/span>
\n \/\/\u83b7\u53d6\u5f53\u524d\u5143\u7d20\u5728\u65b0\u7684\u6876\u6570\u7ec4\u4e2d\u7684index<\/span>
\n int<\/span> newIndex =<\/span> current.<\/span>key.<\/span>hashCode<\/span>(<\/span>)<\/span> &<\/span> (<\/span>newTable.<\/span>length–<\/span>1<\/span>)<\/span>;<\/span>
\n if<\/span>(<\/span> newTable[<\/span>newIndex]<\/span>==<\/span>null<\/span>)<\/span>{<\/span>
\n newTable[<\/span>newIndex]<\/span> =<\/span> current;<\/span>
\n Node<\/span><<\/span> K<\/span>,<\/span>V<\/span>><\/span><\/span>next =<\/span> current.<\/span>next;<\/span>
\n current.<\/span>next =<\/span> null<\/span>;<\/span>
\n current =<\/span> next;<\/span>
\n }<\/span>else<\/span>{<\/span>
\n \/\/\u5934\u63d2\u6cd5<\/span>
\n Node<\/span><<\/span> K<\/span>,<\/span>V<\/span>><\/span><\/span>next =<\/span>current.<\/span>next;<\/span>
\n current.<\/span>next =<\/span> newTable[<\/span>newIndex]<\/span>;<\/span>
\n newTable[<\/span>newIndex]<\/span> =<\/span> current;<\/span>
\n current =<\/span> next;<\/span>
\n }<\/span>
\n }<\/span>
\n }<\/span>
\n this<\/span>.<\/span>table =<\/span> newTable;<\/span>
\n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span> "\u6269\u5bb9\u4e86"<\/span>+<\/span> table.<\/span>length)<\/span>;<\/span>
\n }<\/span><\/p>\n

\/\/hashmap\u91cc\u9762\u7684\u8282\u70b9 entry<\/span>
\n private<\/span> class<\/span> Node<\/span><<\/span>K<\/span>,<\/span> V<\/span>><\/span><\/span> {<\/span>
\n public<\/span> Node<\/span>(<\/span>)<\/span> {<\/span><\/p>\n

}<\/span><\/p>\n

public<\/span> Node<\/span>(<\/span>K<\/span> key,<\/span> V<\/span> value)<\/span> {<\/span>
\n this<\/span>.<\/span>key =<\/span> key;<\/span>
\n this<\/span>.<\/span>value =<\/span> value;<\/span>
\n }<\/span><\/p>\n

public<\/span> K<\/span> key;<\/span>
\n public<\/span> V<\/span> value;<\/span>
\n public<\/span> Node<\/span><<\/span>K<\/span>,<\/span>V<\/span>><\/span><\/span> next;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

test\u7684\u7528\u65f6\u53d8\u4e3a：35ms<\/p>\n

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

\u4f46\u662f\u5bfc\u81f4\u6876\u6570\u7ec4\u5f88\u5927，\u800c\u4e14\u5982\u679chash\u51b2\u7a81\u5f88\u4e25\u91cd\u7684\u8bdd\u67e5\u627e\u8fd8\u662fO(n)，\u6240\u4ee5\u5728jdk1.8\u5f15\u8fdb\u4e86\u7ea2\u9ed1\u6811<\/p>\n

\u6ce8\u610f\u70b9<\/h3>\n

\u591a\u7ebf\u7a0b\u4e0bhashmap\u5b58\u5728\u6b7b\u5faa\u73af\u3001\u6570\u636e\u4e22\u5931\u7684\u95ee\u9898\u3002<\/p>\n

1\u3001jdk1.7\u6269\u5bb9\u65f6\u91c7\u7528\u7684\u662f\u5934\u63d2\u6cd5，1.8\u4e4b\u540e\u6539\u4e3a\u4e86\u5c3e\u63d2\u6cd5<\/p>\n

  • \u5934\u63d2\u6cd5\u7684\u6548\u7387\u76f8\u6bd4\u5c3e\u63d2\u6cd5\u9ad8，\u56e0\u4e3a\u5934\u63d2\u6cd5\u53ea\u9700\u8981\u5c06\u65b0\u63d2\u5165\u7684\u8282\u70b9\u7684next\u6307\u5411\u539f\u60f3\u7684\u5934\u8282\u70b9，\u5c3e\u63d2\u6cd5\u9700\u8981\u904d\u5386\u5230\u94fe\u8868\u6700\u5c3e\u7aef\u3002<\/li>\n
  • \u5934\u63d2\u6cd5\u5728\u591a\u7ebf\u7a0b\u60c5\u51b5\u4e0b\u5b58\u5728\u6b7b\u5faa\u73af\u7684\u95ee\u9898：\u6bd4\u5982\u4e24\u4e2a\u7ebf\u7a0b，\u7ebf\u7a0b1\u4fee\u6539\u5934\u8282\u70b9\u4e4b\u540e，\u7ebf\u7a0b2\u62ff\u5230current\u7684\u8282\u70b9\u8fd8\u662f\u5df2\u7ecf\u4fee\u6539\u4e4b\u540e\u7684，\u90a3\u4e48\u5c31\u4f1a\u5bfc\u81f4current.next = current\u7684\u64cd\u4f5c，\u5bfc\u81f4\u4e86\u6b7b\u5faa\u73af；\u5c3e\u63d2\u6cd5\u4e0d\u5b58\u5728\u8fd9\u4e2a\u95ee\u9898\u3002<\/li>\n
  • JDK\u5b98\u65b9\u53ef\u80fd\u8003\u8651\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u4fdd\u8bc1HashMap\u7684\u53ef\u7528\u6027\u800c\u4e0d\u4fdd\u8bc1\u6b63\u786e\u6027，\u4f46\u662f\u591a\u7ebf\u7a0b\u4e0b\u4f7f\u7528hashmap\u672c\u5c31\u662f\u4e00\u4e2a\u9519\u8bef\u7684\u884c\u4e3a，\u56e0\u4e3a\u9519\u8bef\u7684\u884c\u4e3a\u6362\u6210\u4e86\u4e00\u4e2a\u6548\u7387\u6bd4\u8f83\u4f4e\u7684\u64cd\u4f5c\u6211\u611f\u89c9\u6709\u70b9\u672c\u672b\u5012\u7f6e\u4e86<\/li>\n

    2\u3001\u5173\u4e8e\u6570\u636e\u4e22\u5931\u7684\u95ee\u9898<\/p>\n

  • \u4e24\u4e2a\u7ebf\u7a0b1，2\u540c\u65f6put\u64cd\u4f5c，\u5e76\u4e14\u53d1\u751f\u4e86\u54c8\u5e0c\u51b2\u7a81（index\u76f8\u540c）<\/li>\n
  • \u5f53\u5224\u65ad\u5b8c\u51b2\u7a81，\u5e76\u4e14\u8ba1\u7b97\u5230\u5e94\u8be5\u63d2\u5165\u5230\u54ea\u4e00\u4e2a\u4f4d\u7f6e\u7684\u65f6\u5019，\u7ebf\u7a0b1\u6302\u8d77<\/li>\n
  • \u7ebf\u7a0b2\u6267\u884c\u63d2\u5165\u64cd\u4f5c，\u7531\u4e8e\u4e4b\u524d\u7ebf\u7a0b1\u5df2\u7ecf\u8ba1\u7b97\u5230\u5e94\u8be5\u63d2\u5165\u7684\u4f4d\u7f6e，\u6b64\u65f6\u76f4\u63a5\u63d2\u5165\u5c31\u5bfc\u81f4\u7ebf\u7a0b2\u63d2\u5165\u7684\u6570\u636e\u88ab\u8986\u76d6\u4e86<\/li>\n","protected":false},"excerpt":{"rendered":"

    \u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb434\u6b21\uff0c\u70b9\u8d5e5\u6b21\uff0c\u6536\u85cf4\u6b21\u3002\u672c\u6587\u5b9e\u73b0\u4e86\u4e00\u4e2a\u7b80\u5316\u7248\u7684HashMap\u6570\u636e\u7ed3\u6784\uff0c\u57fa\u4e8eJDK1.7\u7248\u672c\u8bbe\u8ba1\uff0c\u4f7f\u7528\u6570\u7ec4+\u94fe\u8868\u7ed3\u6784\u5b58\u50a8\u6570\u636e\u3002\u6838\u5fc3\u529f\u80fd\u5305\u62ec\uff1a \u57fa\u672c\u64cd\u4f5c\uff1a\u5b9e\u73b0\u4e86put\u3001get\u3001remove\u7b49\u57fa\u672c\u65b9\u6cd5 \u521d\u59cb\u8bbe\u7f6e\uff1a\u9ed8\u8ba4\u5bb9\u91cf16\uff0c\u8d1f\u8f7d\u56e0\u5b500.75 \u54c8\u5e0c\u8ba1\u7b97\uff1a\u901a\u8fc7key\u7684hashCode\u4e0e\u6570\u7ec4\u957f\u5ea6\u53d6\u6a21\u786e\u5b9a\u7d22\u5f15\u4f4d\u7f6e \u6269\u5bb9\u673a\u5236\uff1a\u5f53\u5143\u7d20\u6570\u91cf\u8d85\u8fc7\u9608\u503c\u65f6\u8fdb\u884c\u6570\u7ec4\u6269\u5bb9\uff08\u4ec5\u7b2c\u4e8c\u7248\u5b9e\u73b0\uff09 \u4ee3\u7801\u5305\u542b\u4e24\u79cd\u5b9e\u73b0\u7248\u672c\uff1a\u57fa\u7840\u7248\u548c\u6269\u5bb9\u7248\uff0c\u6d4b\u8bd5\u7528\u4f8b\u9a8c\u8bc1\u4e8610\u4e07\u7ea7\u6570\u636e\u7684\u6b63\u786e\u5b58\u53d6\u3002\u8be5\u5b9e\u73b0\u5b8c\u6574\u5c55\u793a\u4e86HashMap\u7684\u6838\u5fc3\u539f\u7406\uff0c\u5305\u62ec\u54c8\u5e0c\u51b2\u7a81\u5904\u7406\u3001\u94fe\u8868\u904d\u5386\u7b49\u5173\u952e\u673a\u5236\u3002<\/p>\n","protected":false},"author":2,"featured_media":41727,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,190,1813,427],"topic":[],"class_list":["post-41729","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-java","tag-190","tag-1813","tag-427"],"yoast_head":"\n\u624b\u5199HashMap - 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