JAVA绋搴㈣荤锛楂存寸寮虹

绗舵锛涓骞

璁や负涓骞村浜搴ヨ涓涓ㄦ锛杩涓舵灏浼娣姹版涓逛浠ｇ浜恒杩涓舵锛浠蛋烘″杩ョぞ浼锛涓轰绋搴锛姝ｅ功 涓瀹硅姝ｇ浼涓绾у浠ラ濡浣㈤濡浣浣跨ㄩ」宸ュ枫椤圭浣躲浠浠ｇ濡浣娴璇濡浣ㄧ嚎涓杩琛绛绛锛绉疮浜涓瀹 寮缁锛涔瀵逛唬浜涓瀹娣卞ョ璁よ锛涓杈绾补Coder舵

绗舵锛浜骞

浜骞村哄绋搴绗涓ㄦ浜浜哄ㄤ骞撮锛や瀹宸ヤ锛ㄧ┖浣堕村烘浼绌跺涓瑗匡杩浜浜烘案杩灏辨釜Coder锛骞寸邯澶т浜垮琚 村勾杞荤浜虹椤舵匡浜浜哄ㄤ骞撮锛や浠ｇ涔澶锛杩》浜绌跺绉缁浜N澶濂戒功涓浜瀹Github涓浜杩浜浜哄ㄤ骞 跺峰ㄦ涓㈢藉骞朵娓妤繁ョ灞瑰锛浠涓Coder姝ヨ蛋绯荤甯舵甯锛涓洪」涓缂虹浜虹┿

绗舵锛骞

骞村涓涓ㄦ浜锛杞户缁涓绋搴灏卞ㄨ涓逛濡ㄥ骞村氨卞涓杞璺苟涓涓轰璇锛ｄㄥ骞寸杩涓逛锛浜 浜哄舵夸负涓瀵硅涓娣卞ヨ璇瀵规娣卞ヨ璇戒跺濮瀵逛涓骇杩琛绋搴锛杩风浜哄ㄥ烘浠荤芥CTO瀹躲棣甯 舵甯绛抽浣锛杩瀵逛繁缁瀵规浠惰ｈ浜锛褰惰垮ㄧ涔缁涓浼浜浣

绗ㄥ荤涓涓锛璁や负锛浣宸ヤ骞撮澧裤瀵圭娲诲借璇娣卞ワ搴褰涓涓涓锛

1板涓褰涓绋搴锛

2板搴涓搴璇ヤ杈瀛浠ョ搴涓鸿涓锛

3瀵圭绋板绉浠涔风搴ㄥ氨濂藉㈣绌讹

缁锛‘繁涓瑙锛瀵硅繁瑙璐璐ｅ苟涓轰

充」

ㄧ涓缁父颁浜洪」锛渚ф㈣瑙ヨ锛㈣涓昏癸椤圭+烘+涓汉娼锛涔灏辨间煎瑰伙

充」锛璁や负骞跺缂绋缃濮浜烘硅鹃甯璁茬涓娈佃甯稿ソ锛浠缁浜у堕㈣瀹浼瀵搴娌藉藉锛浠ぇㄥ甸芥浜у涓涓芥涓涓ā锛浣充娇凤 宸辨娌℃翠釜绯荤舵浜у娓妤锛骞惰戒缁娓妤锛涓轰涔杩涓郴缁锛杩涓郴缁浠峰兼涔锛杩涓郴缁斤浼缂虹规锛濡璁╀拌璁¤涓 绯荤浣浼濡浣璁捐锛

瑙寰杩灏卞凡缁冻浠ユ涔璁镐浠浠宸ヤ涓骞达涔璁镐」腑寰瓒抽妯″锛褰惰浜涓瀹ｅ夸娉瑰锛浣浣寮ヨˉ杩涓ｅ匡

浠硅甯璇涓荤癸

1‘浣椤圭板浠涔锛姐

2‘浣椤圭翠舵锛ㄩ㈣跺藉娓妤扮荤㈣瀹骞朵娓妤版轰璋ㄥ板浣跨ㄤ涔瑰ㄣ

3‘浣妯″ㄦ翠釜椤圭腑澶浣缃浣ㄣ

4‘浣妯″ㄥ颁村ソ涓浜浠ュ浜瑙ｄ涓翠釜椤圭ㄥ颁

ㄤ娉瑰繁宸ヤ骞撮繁涓ｄ璇存椤圭典锛杩涓瀹ｅ椤癸锛浠ラ杩杩绉瑰ヤ瀹绋搴板讥琛ュ苟涓澧杩㈣瀹瀵逛濂芥搴

充涓

瀹椤圭涓3骞村伐浣缁Java绋搴搴璇ュ峰斤杩芥Java绋搴浠杈冲瀹广杩瑕璇存涓锛浠ヤ涓剧瀹逛借浼涓瑗库-浣浣寰瓒澶锛缁藉扮璇浠枫垮扮按垮涔瓒楂

1烘娉

杩staticfinaltransient绛抽浣foreach寰绛绛浠澶╅㈣static抽浣 濡浣绛static淇グ淇グ规浼璁や负浣硷绛洪锛浼璁や负浣涓锛绛洪ㄧ被浼璁や负浣寰濂斤绛洪瀵煎浼瀵逛寰婊 涓鸿界轰甯哥》绌舵

娣卞ョ涓娆★璁板㈣瀹存颁Volatile 搴灞瀹锛椤轰究涓锛㈣琚㈣韩灏辨稿锛㈣瀹介涓朵璁╅㈣瑙伴㈣瀹涔涓辩绌舵浜猴澧浜㈣瀵 濂芥锛缁╃灏辨杩涓锛锛涓瑕瑙寰杩澶规姹典-瓒绠瓒界轰涓汉姘村钩锛汉瀵逛澶у伴芥互娣卞害浼骞垮害娆′涓烘锛璁般

2

甯搁瑕锛涔瀹广烘灏辨ListMapSet锛绉瀹绫荤搴灞瀹锛瀹绫荤浼缂虹广

瑕ArrayListLinkedListHashtableHashMapConcurrentHashMap HashSet瀹锛芥╀绛锛褰惰芥CopyOnWrite瀹瑰ㄥQueue濂戒杩浜澶澶璇翠 锛ConcurrentHashMapㄩ㈣涓瑰锛澶ф涓鸿涓被浠ヨ洪甯稿锛充ConcurrentHashMap锛 缁缃浠渚涓瑰绛绌舵瑰锛

锛1锛ConcurrentHashMap娈垫

锛2锛ConcurrentHashMap璇绘锛涓轰涔

锛3锛ConcurrentHashMap杩唬ㄦ己涓存х杩唬ㄨ急涓存х杩唬ㄣ

3璁捐妯″

ヤ互涓鸿瑕涓瀹癸缁ㄩ块宸村反B2B浜涓ㄩ㈣跺琚涓娆★褰堕楗板ㄦā寮

褰跺变滑涓借涔╋涓轰㈣瀛锛璁捐妯″ㄥ伐浣涓甯搁瑕甯告ㄧ锛23绉璁捐妯″腑圭绌跺父ㄧョ灏卞浠ヤ锛㈣涓充璁℃ā寮涓昏涓瑰锛

锛1锛浣椤圭腑ㄥ颁璁捐妯″濡浣浣跨ㄣ

锛2锛ラ甯哥ㄨ璁℃ā寮浼缂虹广

锛3锛界诲哄父ㄨ璁℃ā寮UML俱

4澶绾跨

杩涔涓浜涓轰骞村伐浣缁锛浠ュ烘涓浼瀹澶绾跨浜锛浼娣卞ヤ浜姣濡璇ThreadRunnable哄 绯汇澶娆start涓涓嚎绋浼枫绾跨舵褰惰烘锛轰帮娆￠㈣涔借堕颁涓涓锛涓灏界稿

荤璧锋ユ 杩涔涓涓锛

濡Thread1Thread2ThreaD3Thread4＄嚎绋璁CDEF涓澶у绾跨界璁″姣浜ょThread5绾跨姹伙搴褰濡浣瀹锛

缃浠杩涓绛妗涓撅java.util.concurrent涓灏辨绫诲浠ヤ娇ㄣ

澶锛绾跨姹涔杈甯搁涓锛甯哥ㄧ绾跨姹绉锛杩绉绾跨姹涔存浠涔哄绯伙绾跨姹瀹风锛瀹涓浜锛浼缁浣涓浜蜂烘璁╀绛杩绉烘浣跨ㄤ涔风绾跨姹姣杈

界惰娆￠㈣涓澶锛浣绾跨姝ャ杩涔广synchronizedReentrantLock哄 synchronized规规姝婚ユ规绛绛

5JDK婧

瑕虫块宸ヨ锛JDK婧涓涓璇汇涓㈢瀹瑰借蜂烘绯昏捣ワJDK婧灏辨瀹扮浣骞虫舵遍荤浜㈣杩绋涓涓 灏JDK婧锛朵腑荤涓涓锛StringhashCode()规瀹锛骞稿ソ骞虫String婧浠ｇ寰澶锛绛浜涓ぇ 姒

JDK婧跺娌′涔濂芥荤锛绾补涓汉锛荤涓涓姣杈瑕婧锛

锛1锛ListMapSet瀹绫荤婧浠ｇ

锛2锛ReentrantLockAQS婧浠ｇ

锛3锛AtomicInteger瀹锛涓昏借娓妤CAS哄跺苟涓AtomicInteger浣╃CAS哄跺

锛4锛绾跨姹瀹

锛5锛Object绫讳腑规浠ュ姣釜规浣

杩浜跺瑕姹锛骞翠村勾烘JDK涓瑕绫荤婧浠ｇ绌朵涓锛辫垂堕淬辫垂绮惧锛褰跺澶寸锛煎-涓浠浠负浜搴浠㈣

6妗

甯歌锛㈣蹇涓瑗裤涓ヨ浼涓涓浣浠」腑浣跨ㄧ妗讹跺浣涓浜烘ㄦ舵锛姣濡宠Spring濮bean 跺涓浜浜璇ユ宠bean姣跺涓浜浜璇ユMyBatis涓$#哄绛锛杩浜芥杈瀹浜锛骞虫剁Н绱濂姐澶瀛 妗剁浣跨ㄧ堕戒

濡涓绛寰濂斤㈣瀹寰寰浼娣卞ュ伴浜妗剁瀹澶灏辨Spring AOP瀹锛褰惰涓绠涓ゅ璇灏辨瀹浜匡充娇浣涓浼澶涓涓灏卞ソ浜扮讳涓SpringBean宸ュ瀹 UML撅褰堕㈠杩蜂涓娣卞害锛瀵圭涓烘ョ/(o)/~~

7版

版涔戒般涓浜烘unionunion all哄left join绉绱㈠跺哄氨涓璋浜锛姣杈瑕灏辨版ц界浼锛濡瀵逛版ц戒涓绐涓锛ｄ堕达杩缓璁ㄩ㈣变涓ゅぉ涓 SQL虹SQL浼瀹瑰澶涓涓

涓杩版ㄦ蹇锛涓瀹跺寰寰寰澶ㄩ濡浣瀵规版涓烘甯稿ソ锛涔芥瑕浣锛浼拌浼浣惧板版浣跨ㄤ姹甯搁ㄩㄩ荤间涓

8版绠娉

版绠娉锛瀵逛绋搴ヨ锛浼姣涓浼濂借涓ㄥ伐浣涓瀵硅芥淳涓ㄥ恒扮捐〃虹锛娣卞ヤ浜浣涔涓撅洪瑕锛姣杈 瑕AVL绾㈤锛浠ヤ浜瑙ｅ浠蜂瀹锛浣ラ浠涔ユ炬浠涔钩琛℃锛AVL绾㈤哄璁板娆￠㈣锛涓㈣瀹 颁版绱㈠锛浠锛浣ラ绱㈠浣跨ㄧ版瀹锛

绛扮ㄧHash琛ㄥэ绛浠浣ラ涓轰涔瑕浣跨ㄦ锛绛板涓Hash琛ㄥ戒虹姣杈澶茬锛ㄥ涓虫浜跨骇版 锛浼澶уぇ澧ユ剧堕村搴姣杈绋冲锛烘璇澶浜涓娆″氨芥惧版宠版瀵规硅涓瀹ㄥ锛浠氦娴浜涓涓杩涓锛涔戒 涓轰涔瑕浣跨ㄦ锛杩涓璇达缃浠寰绱㈠涓轰涔瑕浣跨ㄦュ

充娉锛涓浼涓崇绌跺氨绠浜锛璁板娆￠㈣瀵规归锛Collections.sort规浣跨ㄧ搴规锛棰锛琛涓褰朵负浜 剧ず瀛瀵圭娉涔涓瀹绌(锕)b锛杩‖澶寸浜涓芥娉℃搴с褰剁妗涓磋叮缃浠浠ュ涓涓 Collections.sort规婧浠ｇ锛ㄧ绉TimSort搴锛涔灏辨寮哄褰骞舵搴

9Java

轰锛Java哄璇ユ瑕涓瀹癸缁ㄨ瀹跺涓扮姒涔负0瑕ラ锛骞村变澶ч堕村绌Java虹锛ㄥ甯娣卞ョ瑙Java猴JVM楂绾х规т浣冲璺点锛灏辫浜涓涓浜

瑷褰姝ｄ锛界Java烘病帮浣瑙寰杩蹇瑕绌剁锛灏辩板涓涓绾插э璋璋Java轰腑姣杈瑕瀹癸

锛1锛Java虹瀛甯灞

锛2锛GC绠娉绉炬堕

锛3锛绫诲杞芥哄讹涔灏辨浜插娲炬ā

锛4锛Java瀛妯″

锛5锛happens-before瑙

锛6锛volatile抽浣跨ㄨ

涔璁搁㈣浣ㄨ蛋澶х璺锛涓涓浼

10Web归㈢涓浜

Java涓昏㈠Web绔姝Web涓浜涔

纰板拌澶涓や釜

璋璋甯寮Session绉瀹瑰

甯哥ㄧ绉界烘ヨ舵㈣瀹甯告弧

澶涓涓父璁蹭涓SessionCookie哄绯讳互Session瀹杩涓や釜涔澶锛web.xml㈢瀹规癸FilterServletListener锛涓璇村瀹浠瀹涓娓浜妤э冲藉瀹浠浣跨ㄧユ圭ュ澶锛涓浜缁归㈡濡get/post哄forward/瀹哄HTTPS瀹涔藉戒琚瀵般

濡磋叮堕达寤鸿瀛绌朵涓SOARPC锛㈠′绯伙澶у甯寮舵蹇澶锛借广娌荤剧灞¤涓姐