java浼佷笟闈㈣瘯锛堝洓锛�

1銆侀潰鍚戝璞＄殑鐗瑰緛鏈夊摢浜涙柟闈�

1.鎶借薄锛氭娊璞″氨鏄拷鐣ヤ竴涓富棰樹腑涓庡綋鍓嶇洰鏍囨棤鍏崇殑閭ｄ簺鏂归潰锛屼互渚挎洿鍏呭垎鍦版敞鎰忎笌褰撳墠鐩爣鏈夊叧鐨勬柟闈€�傛娊璞″苟涓嶆墦绠椾簡瑙ｅ叏閮ㄩ棶棰橈紝鑰屽彧鏄�夋嫨鍏朵腑鐨勪竴閮ㄥ垎锛屾殏鏃朵笉鐢ㄩ儴鍒嗙粏鑺傘�傛娊璞″寘鎷袱涓柟闈紝涓�鏄繃绋嬫娊璞★紝浜屾槸鏁版嵁鎶借薄銆�

2.缁ф壙锛氱户鎵挎槸涓�绉嶈仈缁撶被鐨勫眰娆℃ā鍨嬶紝骞朵笖鍏佽鍜岄紦鍔辩被鐨勯噸鐢紝瀹冩彁渚涗簡涓�绉嶆槑纭〃杩板叡鎬х殑鏂规硶銆傚璞＄殑涓�涓柊绫诲彲浠ヤ粠鐜版湁鐨勭被涓淳鐢燂紝杩欎釜杩囩▼绉颁负绫荤户鎵裤�傛柊绫荤户鎵夸簡鍘熷绫荤殑鐗规�э紝鏂扮被绉颁负鍘熷绫荤殑娲剧敓绫伙紙瀛愮被锛夛紝鑰屽師濮嬬被绉颁负鏂扮被鐨勫熀绫伙紙鐖剁被锛夈�傛淳鐢熺被鍙互浠庡畠鐨勫熀绫婚偅閲岀户鎵挎柟娉曞拰瀹炰緥鍙橀噺锛屽苟涓旂被鍙互淇敼鎴栧鍔犳柊鐨勬柟娉曚娇涔嬫洿閫傚悎鐗规畩鐨勯渶瑕併��

3.灏佽锛氬皝瑁呮槸鎶婅繃绋嬪拰鏁版嵁鍖呭洿璧锋潵锛屽鏁版嵁鐨勮闂彧鑳介�氳繃宸插畾涔夌殑鐣岄潰銆傞潰鍚戝璞¤绠楀浜庤繖涓熀鏈蹇碉紝鍗崇幇瀹炰笘鐣屽彲浠ヨ鎻忕粯鎴愪竴绯诲垪瀹屽叏鑷不銆佸皝瑁呯殑瀵硅薄锛岃繖浜涘璞￠�氳繃涓�涓彈淇濇姢鐨勬帴鍙ｈ闂叾浠栧璞°��

4. 澶氭�佹�э細澶氭�佹�ф槸鎸囧厑璁镐笉鍚岀被鐨勫璞″鍚屼竴娑堟伅浣滃嚭鍝嶅簲銆傚鎬佹�у寘鎷弬鏁板寲澶氭�佹�у拰鍖呭惈澶氭�佹�с�傚鎬佹�ц瑷�鍏锋湁鐏垫椿銆佹娊璞°�佽涓哄叡浜�佷唬鐮佸叡浜殑浼樺娍锛屽緢濂界殑瑙ｅ喅浜嗗簲鐢ㄧ▼搴忓嚱鏁板悓鍚嶉棶棰樸��

2銆丼tring鏄渶鍩烘湰鐨勬暟鎹被鍨嬪悧?

鍩烘湰鏁版嵁绫诲瀷鍖呮嫭byte銆乮nt銆乧har銆乴ong銆乫loat銆乨ouble銆乥oolean鍜宻hort銆�

java.lang.String绫绘槸final绫诲瀷鐨勶紝鍥犳涓嶅彲浠ョ户鎵胯繖涓被銆佷笉鑳戒慨鏀硅繖涓被銆備负浜嗘彁楂樻晥鐜囪妭鐪佺┖闂达紝鎴戜滑搴旇鐢⊿tringBuffer绫�

3銆乮nt 鍜� Integer 鏈変粈涔堝尯鍒�

Java 鎻愪緵涓ょ涓嶅悓鐨勭被鍨嬶細寮曠敤绫诲瀷鍜屽師濮嬬被鍨嬶紙鎴栧唴缃被鍨嬶級銆侷nt鏄痡ava鐨勫師濮嬫暟鎹被鍨嬶紝Integer鏄痡ava涓篿nt鎻愪緵鐨勫皝瑁呯被銆侸ava涓烘瘡涓師濮嬬被鍨嬫彁渚涗簡灏佽绫汇��

鍘熷绫诲瀷灏佽绫籦ooleanBooleancharCharacterbyteByteshortShortintIntegerlongLongfloatFloatdoubleDouble

寮曠敤绫诲瀷鍜屽師濮嬬被鍨嬬殑琛屼负瀹屽叏涓嶅悓锛屽苟涓斿畠浠叿鏈変笉鍚岀殑璇箟銆傚紩鐢ㄧ被鍨嬪拰鍘熷绫诲瀷鍏锋湁涓嶅悓鐨勭壒寰佸拰鐢ㄦ硶锛屽畠浠寘鎷細澶у皬鍜岄�熷害闂锛岃繖绉嶇被鍨嬩互鍝绫诲瀷鐨勬暟鎹粨鏋勫瓨鍌紝褰撳紩鐢ㄧ被鍨嬪拰鍘熷绫诲瀷鐢ㄤ綔鏌愪釜绫荤殑瀹炰緥鏁版嵁鏃舵墍鎸囧畾鐨勭己鐪佸�笺�傚璞″紩鐢ㄥ疄渚嬪彉閲忕殑缂虹渷鍊间负null锛岃�屽師濮嬬被鍨嬪疄渚嬪彉閲忕殑缂虹渷鍊间笌瀹冧滑鐨勭被鍨嬫湁鍏炽��

4銆丼tring 鍜孲tringBuffer鐨勫尯鍒�

JAVA骞冲彴鎻愪緵浜嗕袱涓被锛歋tring鍜孲tringBuffer锛屽畠浠彲浠ュ偍瀛樺拰鎿嶄綔瀛楃涓诧紝鍗冲寘鍚涓瓧绗︾殑瀛楃鏁版嵁銆傝繖涓猄tring绫绘彁渚涗簡鏁板�间笉鍙敼鍙樼殑瀛楃涓层�傝�岃繖涓猄tringBuffer绫绘彁渚涚殑瀛楃涓茶繘琛屼慨鏀广�傚綋浣犵煡閬撳瓧绗︽暟鎹鏀瑰彉鐨勬椂鍊欎綘灏卞彲浠ヤ娇鐢⊿tringBuffer銆傚吀鍨嬪湴锛屼綘鍙互浣跨敤StringBuffers鏉ュ姩鎬佹瀯閫犲瓧绗︽暟鎹��

5銆佽繍琛屾椂寮傚父涓庝竴鑸紓甯告湁浣曞紓鍚岋紵

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6銆佽鍑篠ervlet鐨勭敓鍛藉懆鏈燂紝骞惰鍑篠ervlet鍜孋GI鐨勫尯鍒��

Servlet琚湇鍔″櫒瀹炰緥鍖栧悗锛屽鍣ㄨ繍琛屽叾init鏂规硶锛岃姹傚埌杈炬椂杩愯鍏秙ervice鏂规硶锛宻ervice鏂规硶鑷姩娲鹃仯杩愯涓庤姹傚搴旂殑doXXX鏂规硶锛坉oGet锛宒oPost锛夌瓑锛屽綋鏈嶅姟鍣ㄥ喅瀹氬皢瀹炰緥閿�姣佺殑鏃跺�欒皟鐢ㄥ叾destroy鏂规硶銆�

涓巆gi鐨勫尯鍒湪浜巗ervlet澶勪簬鏈嶅姟鍣ㄨ繘绋嬩腑锛屽畠閫氳繃澶氱嚎绋嬫柟寮忚繍琛屽叾service鏂规硶锛屼竴涓疄渚嬪彲浠ユ湇鍔′簬澶氫釜璇锋眰锛屽苟涓斿叾瀹炰緥涓�鑸笉浼氶攢姣侊紝鑰孋GI瀵规瘡涓姹傞兘浜х敓鏂扮殑杩涚▼锛屾湇鍔″畬鎴愬悗灏遍攢姣侊紝鎵�浠ユ晥鐜囦笂浣庝簬servlet銆�

7銆佽鍑篈rrayList,Vector, LinkedList鐨勫瓨鍌ㄦ�ц兘鍜岀壒鎬�

ArrayList鍜孷ector閮芥槸浣跨敤鏁扮粍鏂瑰紡瀛樺偍鏁版嵁锛屾鏁扮粍鍏冪礌鏁板ぇ浜庡疄闄呭瓨鍌ㄧ殑鏁版嵁浠ヤ究澧炲姞鍜屾彃鍏ュ厓绱狅紝瀹冧滑閮藉厑璁哥洿鎺ユ寜搴忓彿绱㈠紩鍏冪礌锛屼絾鏄彃鍏ュ厓绱犺娑夊強鏁扮粍鍏冪礌绉诲姩绛夊唴瀛樻搷浣滐紝鎵�浠ョ储寮曟暟鎹揩鑰屾彃鍏ユ暟鎹參锛孷ector鐢变簬浣跨敤浜唖ynchronized鏂规硶锛堢嚎绋嬪畨鍏級锛岄�氬父鎬ц兘涓婅緝ArrayList宸紝鑰孡inkedList浣跨敤鍙屽悜閾捐〃瀹炵幇瀛樺偍锛屾寜搴忓彿绱㈠紩鏁版嵁闇�瑕佽繘琛屽墠鍚戞垨鍚庡悜閬嶅巻锛屼絾鏄彃鍏ユ暟鎹椂鍙渶瑕佽褰曟湰椤圭殑鍓嶅悗椤瑰嵆鍙紝鎵�浠ユ彃鍏ラ�熷害杈冨揩銆�

8銆丒JB鏄熀浜庡摢浜涙妧鏈疄鐜扮殑锛熷苟璇村嚭SessionBean鍜孍ntityBean鐨勫尯鍒紝StatefulBean鍜孲tatelessBean鐨勫尯鍒��

EJB鍖呮嫭Session Bean銆丒ntity Bean銆丮essage Driven Bean锛屽熀浜嶫NDI銆丷MI銆丣AT绛夋妧鏈疄鐜般��

SessionBean鍦↗2EE搴旂敤绋嬪簭涓鐢ㄦ潵瀹屾垚涓�浜涙湇鍔″櫒绔殑涓氬姟鎿嶄綔锛屼緥濡傝闂暟鎹簱銆佽皟鐢ㄥ叾浠朎JB缁勪欢銆侲ntityBean琚敤鏉ヤ唬琛ㄥ簲鐢ㄧ郴缁熶腑鐢ㄥ埌鐨勬暟鎹��

瀵逛簬瀹㈡埛鏈猴紝SessionBean鏄竴绉嶉潪鎸佷箙鎬у璞★紝瀹冨疄鐜版煇浜涘湪鏈嶅姟鍣ㄤ笂杩愯鐨勪笟鍔￠�昏緫銆�

瀵逛簬瀹㈡埛鏈猴紝EntityBean鏄竴绉嶆寔涔呮�у璞★紝瀹冧唬琛ㄤ竴涓瓨鍌ㄥ湪鎸佷箙鎬у瓨鍌ㄥ櫒涓殑瀹炰綋鐨勫璞¤鍥撅紝鎴栨槸涓�涓敱鐜版湁浼佷笟搴旂敤绋嬪簭瀹炵幇鐨勫疄浣撱��

Session Bean 杩樺彲浠ュ啀缁嗗垎涓� Stateful Session Bean 涓� Stateless Session Bean 锛岃繖涓ょ鐨� Session Bean閮藉彲浠ュ皢绯荤粺閫昏緫鏀惧湪 method涔嬩腑鎵ц锛屼笉鍚岀殑鏄� Stateful Session Bean 鍙互璁板綍鍛煎彨鑰呯殑鐘舵�侊紝鍥犳閫氬父鏉ヨ锛屼竴涓娇鐢ㄨ�呬細鏈変竴涓浉瀵瑰簲鐨� Stateful Session Bean 鐨勫疄浣撱�係tateless Session Bean 铏界劧涔熸槸閫昏緫缁勪欢锛屼絾鏄粬鍗翠笉璐熻矗璁板綍浣跨敤鑰呯姸鎬侊紝涔熷氨鏄褰撲娇鐢ㄨ�呭懠鍙� Stateless Session Bean 鐨勬椂鍊欙紝EJB Container 骞朵笉浼氭壘瀵荤壒瀹氱殑 Stateless Session Bean 鐨勫疄浣撴潵鎵ц杩欎釜 method銆傛崲瑷�涔嬶紝寰堝彲鑳芥暟涓娇鐢ㄨ�呭湪鎵ц鏌愪釜 Stateless Session Bean 鐨� methods 鏃讹紝浼氭槸鍚屼竴涓� Bean 鐨� Instance 鍦ㄦ墽琛屻�備粠鍐呭瓨鏂归潰鏉ョ湅锛� Stateful Session Bean 涓� Stateless Session Bean 姣旇緝锛� Stateful Session Bean 浼氭秷鑰� J2EE Server 杈冨鐨勫唴瀛橈紝鐒惰�� Stateful Session Bean 鐨勪紭鍔垮嵈鍦ㄤ簬浠栧彲浠ョ淮鎸佷娇鐢ㄨ�呯殑鐘舵�併��

9銆丆ollection 鍜� Collections鐨勫尯鍒��Collection鏄泦鍚堢被鐨勪笂绾ф帴鍙ｏ紝缁ф壙涓庝粬鐨勬帴鍙ｄ富瑕佹湁Set 鍜孡ist.

Collections鏄拡瀵归泦鍚堢被鐨勪竴涓府鍔╃被锛屼粬鎻愪緵涓�绯诲垪闈欐�佹柟娉曞疄鐜板鍚勭闆嗗悎鐨勬悳绱€�佹帓搴忋�佺嚎绋嬪畨鍏ㄥ寲绛夋搷浣溿��

10銆�&鍜�&&鐨勫尯鍒��&鏄綅杩愮畻绗︼紝琛ㄧず鎸変綅涓庤繍绠楋紝&&鏄�昏緫杩愮畻绗︼紝琛ㄧず閫昏緫涓庯紙and锛夈��

11銆丠ashMap鍜孒ashtable鐨勫尯鍒��HashMap鏄疕ashtable鐨勮交閲忕骇瀹炵幇锛堥潪绾跨▼瀹夊叏鐨勫疄鐜帮級锛屼粬浠兘瀹屾垚浜哅ap鎺ュ彛锛屼富瑕佸尯鍒湪浜嶩ashMap鍏佽绌猴紙null锛夐敭鍊硷紙key锛�,鐢变簬闈炵嚎绋嬪畨鍏紝鏁堢巼涓婂彲鑳介珮浜嶩ashtable銆�

HashMap鍏佽灏唍ull浣滀负涓�涓猠ntry鐨刱ey鎴栬�卾alue锛岃�孒ashtable涓嶅厑璁搞��

HashMap鎶奌ashtable鐨刢ontains鏂规硶鍘绘帀浜嗭紝鏀规垚containsvalue鍜宑ontainsKey銆傚洜涓篶ontains鏂规硶瀹规槗璁╀汉寮曡捣璇В銆� Hashtable缁ф壙鑷狣ictionary绫伙紝鑰孒ashMap鏄疛ava1.2寮曡繘鐨凪ap interface鐨勪竴涓疄鐜般��

鏈�澶х殑涓嶅悓鏄紝Hashtable鐨勬柟娉曟槸Synchronize鐨勶紝鑰孒ashMap涓嶆槸锛屽湪澶氫釜绾跨▼璁块棶Hashtable鏃讹紝涓嶉渶瑕佽嚜宸变负瀹冪殑鏂规硶瀹炵幇鍚屾锛岃�孒ashMap 灏卞繀椤讳负涔嬫彁渚涘鍚屾銆�

Hashtable鍜孒ashMap閲囩敤鐨刪ash/rehash绠楁硶閮藉ぇ姒備竴鏍凤紝鎵�浠ユ�ц兘涓嶄細鏈夊緢澶х殑宸紓銆�

12銆乫inal, finally, finalize鐨勫尯鍒��final 鐢ㄤ簬澹版槑灞炴�э紝鏂规硶鍜岀被锛屽垎鍒〃绀哄睘鎬т笉鍙彉锛屾柟娉曚笉鍙鐩栵紝绫讳笉鍙户鎵裤�俧inally鏄紓甯稿鐞嗚鍙ョ粨鏋勭殑涓�閮ㄥ垎锛岃〃绀烘�绘槸鎵ц銆俧inalize鏄疧bject绫荤殑涓�涓柟娉曪紝鍦ㄥ瀮鍦炬敹闆嗗櫒鎵ц鐨勬椂鍊欎細璋冪敤琚洖鏀跺璞＄殑姝ゆ柟娉曪紝鍙互瑕嗙洊姝ゆ柟娉曟彁渚涘瀮鍦炬敹闆嗘椂鐨勫叾浠栬祫婧愬洖鏀讹紝渚嬪鍏抽棴鏂囦欢绛夈��

13銆乻leep() 鍜� wait() 鏈変粈涔堝尯鍒�?sleep鏄嚎绋嬬被锛圱hread锛夌殑鏂规硶锛屽鑷存绾跨▼鏆傚仠鎵ц鎸囧畾鏃堕棿锛岀粰鎵ц鏈轰細缁欏叾浠栫嚎绋嬶紝浣嗘槸鐩戞帶鐘舵�佷緷鐒朵繚鎸侊紝鍒版椂鍚庝細鑷姩鎭㈠銆傝皟鐢╯leep涓嶄細閲婃斁瀵硅薄閿併�倃ait鏄疧bject绫荤殑鏂规硶锛屽姝ゅ璞¤皟鐢╳ait鏂规硶瀵艰嚧鏈嚎绋嬫斁寮冨璞￠攣锛岃繘鍏ョ瓑寰呮瀵硅薄鐨勭瓑寰呴攣瀹氭睜锛屽彧鏈夐拡瀵规瀵硅薄鍙戝嚭notify鏂规硶锛堟垨notifyAll锛夊悗鏈嚎绋嬫墠杩涘叆瀵硅薄閿佸畾姹犲噯澶囪幏寰楀璞￠攣杩涘叆杩愯鐘舵�併��

14銆丱verload鍜孫verride鐨勫尯鍒�侽verloaded鐨勬柟娉曟槸鍚﹀彲浠ユ敼鍙樿繑鍥炲�肩殑绫诲瀷?

鏂规硶鐨勯噸鍐橭verriding鍜岄噸杞絆verloading鏄疛ava澶氭�佹�х殑涓嶅悓琛ㄧ幇銆傞噸鍐橭verriding鏄埗绫讳笌瀛愮被涔嬮棿澶氭�佹�х殑涓�绉嶈〃鐜帮紝閲嶈浇Overloading鏄竴涓被涓鎬佹�х殑涓�绉嶈〃鐜般�傚鏋滃湪瀛愮被涓畾涔夋煇鏂规硶涓庡叾鐖剁被鏈夌浉鍚岀殑鍚嶇О鍜屽弬鏁帮紝鎴戜滑璇磋鏂规硶琚噸鍐� (Overriding)銆傚瓙绫荤殑瀵硅薄浣跨敤杩欎釜鏂规硶鏃讹紝灏嗚皟鐢ㄥ瓙绫讳腑鐨勫畾涔夛紝瀵瑰畠鑰岃█锛岀埗绫讳腑鐨勫畾涔夊鍚岃鈥滃睆钄解�濅簡銆傚鏋滃湪涓�涓被涓畾涔変簡澶氫釜鍚屽悕鐨勬柟娉曪紝瀹冧滑鎴栨湁涓嶅悓鐨勫弬鏁颁釜鏁版垨鏈変笉鍚岀殑鍙傛暟绫诲瀷锛屽垯绉颁负鏂规硶鐨勯噸杞�(Overloading)銆侽verloaded鐨勬柟娉曟槸鍙互鏀瑰彉杩斿洖鍊肩殑绫诲瀷銆�

15銆乪rror鍜宔xception鏈変粈涔堝尯鍒�?

error 琛ㄧず鎭㈠涓嶆槸涓嶅彲鑳戒絾寰堝洶闅剧殑鎯呭喌涓嬬殑涓�绉嶄弗閲嶉棶棰樸�傛瘮濡傝鍐呭瓨婧㈠嚭銆備笉鍙兘鎸囨湜绋嬪簭鑳藉鐞嗚繖鏍风殑鎯呭喌銆�

exception 琛ㄧず涓�绉嶈璁℃垨瀹炵幇闂銆備篃灏辨槸璇达紝瀹冭〃绀哄鏋滅▼搴忚繍琛屾甯革紝浠庝笉浼氬彂鐢熺殑鎯呭喌銆�

16銆佸悓姝ュ拰寮傛鏈変綍寮傚悓锛屽湪浠�涔堟儏鍐典笅鍒嗗埆浣跨敤浠栦滑锛熶妇渚嬭鏄庛��

濡傛灉鏁版嵁灏嗗湪绾跨▼闂村叡浜�備緥濡傛鍦ㄥ啓鐨勬暟鎹互鍚庡彲鑳借鍙︿竴涓嚎绋嬭鍒帮紝鎴栬�呮鍦ㄨ鐨勬暟鎹彲鑳藉凡缁忚鍙︿竴涓嚎绋嬪啓杩囦簡锛岄偅涔堣繖浜涙暟鎹氨鏄叡浜暟鎹紝蹇呴』杩涜鍚屾瀛樺彇銆傚綋搴旂敤绋嬪簭鍦ㄥ璞′笂璋冪敤浜嗕竴涓渶瑕佽姳璐瑰緢闀挎椂闂存潵鎵ц鐨勬柟娉曪紝骞朵笖涓嶅笇鏈涜绋嬪簭绛夊緟鏂规硶鐨勮繑鍥炴椂锛屽氨搴旇浣跨敤寮傛缂栫▼锛屽湪寰堝鎯呭喌涓嬮噰鐢ㄥ紓姝ラ�斿緞寰�寰�鏇存湁鏁堢巼銆�

17銆乤bstract class鍜宨nterface鏈変粈涔堝尯鍒�?澹版槑鏂规硶鐨勫瓨鍦ㄨ�屼笉鍘诲疄鐜板畠鐨勭被琚彨鍋氭娊璞＄被锛坅bstract class锛夛紝瀹冪敤浜庤鍒涘缓涓�涓綋鐜版煇浜涘熀鏈涓虹殑绫伙紝骞朵负璇ョ被澹版槑鏂规硶锛屼絾涓嶈兘鍦ㄨ绫讳腑瀹炵幇璇ョ被鐨勬儏鍐点�備笉鑳藉垱寤篴bstract 绫荤殑瀹炰緥銆傜劧鑰屽彲浠ュ垱寤轰竴涓彉閲忥紝鍏剁被鍨嬫槸涓�涓娊璞＄被锛屽苟璁╁畠鎸囧悜鍏蜂綋瀛愮被鐨勪竴涓疄渚嬨�備笉鑳芥湁鎶借薄鏋勯�犲嚱鏁版垨鎶借薄闈欐�佹柟娉曘�侫bstract 绫荤殑瀛愮被涓哄畠浠埗绫讳腑鐨勬墍鏈夋娊璞℃柟娉曟彁渚涘疄鐜帮紝鍚﹀垯瀹冧滑涔熸槸鎶借薄绫讳负銆傚彇鑰屼唬涔嬶紝鍦ㄥ瓙绫讳腑瀹炵幇璇ユ柟娉曘�傜煡閬撳叾琛屼负鐨勫叾瀹冪被鍙互鍦ㄧ被涓疄鐜拌繖浜涙柟娉曘�傛帴鍙ｏ紙interface锛夋槸鎶借薄绫荤殑鍙樹綋銆傚湪鎺ュ彛涓紝鎵�鏈夋柟娉曢兘鏄娊璞＄殑銆傚缁ф壙鎬у彲閫氳繃瀹炵幇杩欐牱鐨勬帴鍙ｈ�岃幏寰椼�傛帴鍙ｄ腑鐨勬墍鏈夋柟娉曢兘鏄娊璞＄殑锛屾病鏈変竴涓湁绋嬪簭浣撱�傛帴鍙ｅ彧鍙互瀹氫箟static final鎴愬憳鍙橀噺銆傛帴鍙ｇ殑瀹炵幇涓庡瓙绫荤浉浼硷紝闄や簡璇ュ疄鐜扮被涓嶈兘浠庢帴鍙ｅ畾涔変腑缁ф壙琛屼负銆傚綋绫诲疄鐜扮壒娈婃帴鍙ｆ椂锛屽畠瀹氫箟锛堝嵆灏嗙▼搴忎綋缁欎簣锛夋墍鏈夎繖绉嶆帴鍙ｇ殑鏂规硶銆傜劧鍚庯紝瀹冨彲浠ュ湪瀹炵幇浜嗚鎺ュ彛鐨勭被鐨勪换浣曞璞′笂璋冪敤鎺ュ彛鐨勬柟娉曘�傜敱浜庢湁鎶借薄绫伙紝瀹冨厑璁镐娇鐢ㄦ帴鍙ｅ悕浣滀负寮曠敤鍙橀噺鐨勭被鍨嬨�傞�氬父鐨勫姩鎬佽仈缂栧皢鐢熸晥銆傚紩鐢ㄥ彲浠ヨ浆鎹㈠埌鎺ュ彛绫诲瀷鎴栦粠鎺ュ彛绫诲瀷杞崲锛宨nstanceof 杩愮畻绗﹀彲浠ョ敤鏉ュ喅瀹氭煇瀵硅薄鐨勭被鏄惁瀹炵幇浜嗘帴鍙ｃ��

18銆乭eap鍜宻tack鏈変粈涔堝尯鍒��鏍堟槸涓�绉嶇嚎褰㈤泦鍚堬紝鍏舵坊鍔犲拰鍒犻櫎鍏冪礌鐨勬搷浣滃簲鍦ㄥ悓涓�娈靛畬鎴愩�傛爤鎸夌収鍚庤繘鍏堝嚭鐨勬柟寮忚繘琛屽鐞嗐�傚爢鏄爤鐨勪竴涓粍鎴愬厓绱�

19銆乫orward 鍜宺edirect鐨勫尯鍒�forward鏄湇鍔″櫒璇锋眰璧勬簮锛屾湇鍔″櫒鐩存帴璁块棶鐩爣鍦板潃鐨刄RL锛屾妸閭ｄ釜URL鐨勫搷搴斿唴瀹硅鍙栬繃鏉ワ紝鐒跺悗鎶婅繖浜涘唴瀹瑰啀鍙戠粰娴忚鍣紝娴忚鍣ㄦ牴鏈笉鐭ラ亾鏈嶅姟鍣ㄥ彂閫佺殑鍐呭鏄粠鍝効鏉ョ殑锛屾墍浠ュ畠鐨勫湴鍧�鏍忎腑杩樻槸鍘熸潵鐨勫湴鍧�銆� redirect灏辨槸鏈嶅姟绔牴鎹�昏緫,鍙戦�佷竴涓姸鎬佺爜,鍛婅瘔娴忚鍣ㄩ噸鏂板幓璇锋眰閭ｄ釜鍦板潃锛屼竴鑸潵璇存祻瑙堝櫒浼氱敤鍒氭墠璇锋眰鐨勬墍鏈夊弬鏁伴噸鏂拌姹傦紝鎵�浠ession,request鍙傛暟閮藉彲浠ヨ幏鍙栥��

20銆丒JB涓嶫AVA BEAN鐨勫尯鍒紵Java Bean 鏄彲澶嶇敤鐨勭粍浠讹紝瀵笿ava Bean骞舵病鏈変弗鏍肩殑瑙勮寖锛岀悊璁轰笂璁诧紝浠讳綍涓�涓狫ava绫婚兘鍙互鏄竴涓狟ean銆備絾閫氬父鎯呭喌涓嬶紝鐢变簬Java Bean鏄瀹瑰櫒鎵�鍒涘缓锛堝Tomcat锛夌殑锛屾墍浠ava Bean搴斿叿鏈変竴涓棤鍙傜殑鏋勯�犲櫒锛屽彟澶栵紝閫氬父Java Bean杩樿瀹炵幇Serializable鎺ュ彛鐢ㄤ簬瀹炵幇Bean鐨勬寔涔呮�с�侸ava Bean瀹為檯涓婄浉褰撲簬寰蒋COM妯″瀷涓殑鏈湴杩涚▼鍐匔OM缁勪欢锛屽畠鏄笉鑳借璺ㄨ繘绋嬭闂殑銆侲nterprise Java Bean 鐩稿綋浜嶥COM锛屽嵆鍒嗗竷寮忕粍浠躲�傚畠鏄熀浜嶫ava鐨勮繙绋嬫柟娉曡皟鐢紙RMI锛夋妧鏈殑锛屾墍浠JB鍙互琚繙绋嬭闂紙璺ㄨ繘绋嬨�佽法璁＄畻鏈猴級銆備絾EJB蹇呴』琚竷缃插湪璇稿Webspere銆乄ebLogic杩欐牱鐨勫鍣ㄤ腑锛孍JB瀹㈡埛浠庝笉鐩存帴璁块棶鐪熸鐨凟JB缁勪欢锛岃�屾槸閫氳繃鍏跺鍣ㄨ闂�侲JB瀹瑰櫒鏄疎JB缁勪欢鐨勪唬鐞嗭紝EJB缁勪欢鐢卞鍣ㄦ墍鍒涘缓鍜岀鐞嗐�傚鎴烽�氳繃瀹瑰櫒鏉ヨ闂湡姝ｇ殑EJB缁勪欢銆�

21銆丼tatic Nested Class 鍜� Inner Class鐨勪笉鍚屻��Static Nested Class鏄澹版槑涓洪潤鎬侊紙static锛夌殑鍐呴儴绫伙紝瀹冨彲浠ヤ笉渚濊禆浜庡閮ㄧ被瀹炰緥琚疄渚嬪寲銆傝�岄�氬父鐨勫唴閮ㄧ被闇�瑕佸湪澶栭儴绫诲疄渚嬪寲鍚庢墠鑳藉疄渚嬪寲銆�

22銆丣SP涓姩鎬両NCLUDE涓庨潤鎬両NCLUDE鐨勫尯鍒紵鍔ㄦ�両NCLUDE鐢╦sp:include鍔ㄤ綔瀹炵幇 瀹冩�绘槸浼氭鏌ユ墍鍚枃浠朵腑鐨勫彉鍖栵紝閫傚悎鐢ㄤ簬鍖呭惈鍔ㄦ�侀〉闈紝骞朵笖鍙互甯﹀弬鏁般�傞潤鎬両NCLUDE鐢╥nclude浼爜瀹炵幇,瀹氫笉浼氭鏌ユ墍鍚枃浠剁殑鍙樺寲锛岄�傜敤浜庡寘鍚潤鎬侀〉闈�<%@ include file="included.htm" %>

23銆佷粈涔堟椂鍊欑敤assert銆�assertion(鏂█)鍦ㄨ蒋浠跺紑鍙戜腑鏄竴绉嶅父鐢ㄧ殑璋冭瘯鏂瑰紡锛屽緢澶氬紑鍙戣瑷�涓兘鏀寔杩欑鏈哄埗銆傚湪瀹炵幇涓紝assertion灏辨槸鍦ㄧ▼搴忎腑鐨勪竴鏉¤鍙ワ紝瀹冨涓�涓猙oolean琛ㄨ揪寮忚繘琛屾鏌ワ紝涓�涓纭▼搴忓繀椤讳繚璇佽繖涓猙oolean琛ㄨ揪寮忕殑鍊间负true锛涘鏋滆鍊间负false锛岃鏄庣▼搴忓凡缁忓浜庝笉姝ｇ‘鐨勭姸鎬佷笅锛岀郴缁熷皢缁欏嚭璀﹀憡鎴栭��鍑恒�備竴鑸潵璇达紝assertion鐢ㄤ簬淇濊瘉绋嬪簭鏈�鍩烘湰銆佸叧閿殑姝ｇ‘鎬с�俛ssertion妫�鏌ラ�氬父鍦ㄥ紑鍙戝拰娴嬭瘯鏃跺紑鍚�備负浜嗘彁楂樻�ц兘锛屽湪杞欢鍙戝竷鍚庯紝assertion妫�鏌ラ�氬父鏄叧闂殑銆�

24銆丟C鏄粈涔�? 涓轰粈涔堣鏈塆C?GC鏄瀮鍦炬敹闆嗙殑鎰忔�濓紙Gabage Collection锛�,鍐呭瓨澶勭悊鏄紪绋嬩汉鍛樺鏄撳嚭鐜伴棶棰樼殑鍦版柟锛屽繕璁版垨鑰呴敊璇殑鍐呭瓨鍥炴敹浼氬鑷寸▼搴忔垨绯荤粺鐨勪笉绋冲畾鐢氳嚦宕╂簝锛孞ava鎻愪緵鐨凣C鍔熻兘鍙互鑷姩鐩戞祴瀵硅薄鏄惁瓒呰繃浣滅敤鍩熶粠鑰岃揪鍒拌嚜鍔ㄥ洖鏀跺唴瀛樼殑鐩殑锛孞ava璇█娌℃湁鎻愪緵閲婃斁宸插垎閰嶅唴瀛樼殑鏄剧ず鎿嶄綔鏂规硶銆�

25銆乻hort s1 = 1; s1 = s1 + 1;鏈変粈涔堥敊? short s1 = 1; s1 += 1;鏈変粈涔堥敊?short s1 = 1; s1 = s1 + 1; 锛坰1+1杩愮畻缁撴灉鏄痠nt鍨嬶紝闇�瑕佸己鍒惰浆鎹㈢被鍨嬶級聽 short s1 = 1; s1 += 1;锛堝彲浠ユ纭紪璇戯級

26銆丮ath.round(11.5)绛夋柤澶氬皯? Math.round(-11.5)绛夋柤澶氬皯?Math.round(11.5)==12Math.round(-11.5)==-11round鏂规硶杩斿洖涓庡弬鏁版渶鎺ヨ繎鐨勯暱鏁存暟锛屽弬鏁板姞1/2鍚庢眰鍏秄loor.

27銆丼tring s = new String("xyz");鍒涘缓浜嗗嚑涓猄tring Object?涓や釜

28銆佽璁�4涓嚎绋嬶紝鍏朵腑涓や釜绾跨▼姣忔瀵筳澧炲姞1锛屽彟澶栦袱涓嚎绋嬪j姣忔鍑忓皯1銆傚啓鍑虹▼搴忋��

浠ヤ笅绋嬪簭浣跨敤鍐呴儴绫诲疄鐜扮嚎绋嬶紝瀵筳澧炲噺鐨勬椂鍊欐病鏈夎�冭檻椤哄簭闂銆�

public class ThreadTest1{private int j;public static void main(String args[]){ThreadTest1 tt=new ThreadTest1();Inc inc=tt.new Inc();Dec dec=tt.new Dec();for(int i=0;i<2;i++){Thread t=new Thread(inc);t.start();t=new Thread(dec);t.start();}}private synchronized void inc(){j++;System.out.println(Thread.currentThread().getName()+"-inc:"+j);}

private synchronized void dec(){j--;System.out.println(Thread.currentThread().getName()+"-dec:"+j);聽 }

class Inc implements Runnable{public void run(){for(int i=0;i<100;i++){inc();}}聽 } class Dec implements Runnable{public void run(){for(int i=0;i<100;i++){dec();}}聽 }}

29銆丣ava鏈夋病鏈塯oto?java涓殑淇濈暀瀛楋紝鐜板湪娌℃湁鍦╦ava涓娇鐢ㄣ��

30銆佸惎鍔ㄤ竴涓嚎绋嬫槸鐢╮un()杩樻槸start()?鍚姩涓�涓嚎绋嬫槸璋冪敤start()鏂规硶锛屼娇绾跨▼鎵�浠ｈ〃鐨勮櫄鎷熷鐞嗘満澶勪簬鍙繍琛岀姸鎬侊紝杩欐剰鍛崇潃瀹冨彲浠ョ敱JVM璋冨害骞舵墽琛屻�傝繖骞朵笉鎰忓懗鐫�绾跨▼灏变細绔嬪嵆杩愯銆俽un()鏂规硶鍙互浜х敓蹇呴』閫�鍑虹殑鏍囧織鏉ュ仠姝竴涓嚎绋嬨��

31銆丒JB鍖呮嫭锛圫essionBean,EntityBean锛夎鍑轰粬浠殑鐢熷懡鍛ㄦ湡锛屽強濡備綍绠＄悊浜嬪姟鐨勶紵

SessionBean锛歋tateless Session Bean 鐨勭敓鍛藉懆鏈熸槸鐢卞鍣ㄥ喅瀹氱殑锛屽綋瀹㈡埛鏈哄彂鍑鸿姹傝寤虹珛涓�涓狟ean鐨勫疄渚嬫椂锛孍JB瀹瑰櫒涓嶄竴瀹氳鍒涘缓涓�涓柊鐨凚ean鐨勫疄渚嬩緵瀹㈡埛鏈鸿皟鐢紝鑰屾槸闅忎究鎵句竴涓幇鏈夌殑瀹炰緥鎻愪緵缁欏鎴锋満銆傚綋瀹㈡埛鏈虹涓�娆¤皟鐢ㄤ竴涓猄tateful Session Bean 鏃讹紝瀹瑰櫒蹇呴』绔嬪嵆鍦ㄦ湇鍔″櫒涓垱寤轰竴涓柊鐨凚ean瀹炰緥锛屽苟鍏宠仈鍒板鎴锋満涓婏紝浠ュ悗姝ゅ鎴锋満璋冪敤Stateful Session Bean 鐨勬柟娉曟椂瀹瑰櫒浼氭妸璋冪敤鍒嗘淳鍒颁笌姝ゅ鎴锋満鐩稿叧鑱旂殑Bean瀹炰緥銆侲ntityBean锛欵ntity Beans鑳藉瓨娲荤浉瀵硅緝闀跨殑鏃堕棿锛屽苟涓旂姸鎬佹槸鎸佺画鐨勩�傚彧瑕佹暟鎹簱涓殑鏁版嵁瀛樺湪锛孍ntity beans灏变竴鐩村瓨娲汇�傝�屼笉鏄寜鐓у簲鐢ㄧ▼搴忔垨鑰呮湇鍔¤繘绋嬫潵璇寸殑銆傚嵆浣縀JB瀹瑰櫒宕╂簝浜嗭紝Entity beans涔熸槸瀛樻椿鐨勩�侲ntity Beans鐢熷懡鍛ㄦ湡鑳藉琚鍣ㄦ垨鑰� Beans鑷繁绠＄悊銆侲JB閫氳繃浠ヤ笅鎶�鏈鐞嗗疄鍔★細瀵硅薄绠＄悊缁勭粐锛圤MG锛夌殑瀵硅薄瀹炲姟鏈嶅姟锛圤TS锛夛紝Sun Microsystems鐨凾ransaction Service锛圝TS锛夈�丣ava Transaction API锛圝TA锛夛紝寮�鍙戠粍锛圶/Open锛夌殑XA鎺ュ彛銆�

32銆佸簲鐢ㄦ湇鍔″櫒鏈夐偅浜涳紵

BEA WebLogic Server锛孖BM WebSphere Application Server锛孫racle9i Application Server锛宩Boss锛孴omcat

33銆佺粰鎴戜竴涓綘鏈�甯歌鍒扮殑runtime exception銆�

ArithmeticException, ArrayStoreException, BufferOverflowException, BufferUnderflowException, CannotRedoException, CannotUndoException, ClassCastException, CMMException, ConcurrentModificationException, DOMException, EmptyStackException, IllegalArgumentException, IllegalMonitorStateException, IllegalPathStateException, IllegalStateException, ImagingOpException, IndexOutOfBoundsException, MissingResourceException, NegativeArraySizeException, NoSuchElementException, NullPointerException, ProfileDataException, ProviderException, RasterFormatException, SecurityException, SystemException, UndeclaredThrowableException, UnmodifiableSetException, UnsupportedOperationException

34銆佹帴鍙ｆ槸鍚﹀彲缁ф壙鎺ュ彛? 鎶借薄绫绘槸鍚﹀彲瀹炵幇(implements)鎺ュ彛? 鎶借薄绫绘槸鍚﹀彲缁ф壙瀹炰綋绫�(concrete class)?

鎺ュ彛鍙互缁ф壙鎺ュ彛銆傛娊璞＄被鍙互瀹炵幇(implements)鎺ュ彛锛屾娊璞＄被鏄惁鍙户鎵垮疄浣撶被锛屼絾鍓嶆彁鏄疄浣撶被蹇呴』鏈夋槑纭殑鏋勯�犲嚱鏁般��

35銆丩ist, Set, Map鏄惁缁ф壙鑷狢ollection鎺ュ彛?List锛孲et鏄紝Map涓嶆槸

36銆佽鍑烘暟鎹繛鎺ユ睜鐨勫伐浣滄満鍒舵槸浠�涔�?

J2EE鏈嶅姟鍣ㄥ惎鍔ㄦ椂浼氬缓绔嬩竴瀹氭暟閲忕殑姹犺繛鎺ワ紝骞朵竴鐩寸淮鎸佷笉灏戜簬姝ゆ暟鐩殑姹犺繛鎺ャ�傚鎴风绋嬪簭闇�瑕佽繛鎺ユ椂锛屾睜椹卞姩绋嬪簭浼氳繑鍥炰竴涓湭浣跨敤鐨勬睜杩炴帴骞跺皢鍏惰〃璁颁负蹇欍�傚鏋滃綋鍓嶆病鏈夌┖闂茶繛鎺ワ紝姹犻┍鍔ㄧ▼搴忓氨鏂板缓涓�瀹氭暟閲忕殑杩炴帴锛屾柊寤鸿繛鎺ョ殑鏁伴噺鏈夐厤缃弬鏁板喅瀹氥�傚綋浣跨敤鐨勬睜杩炴帴璋冪敤瀹屾垚鍚庯紝姹犻┍鍔ㄧ▼搴忓皢姝よ繛鎺ヨ〃璁颁负绌洪棽锛屽叾浠栬皟鐢ㄥ氨鍙互浣跨敤杩欎釜杩炴帴銆�

37銆乤bstract鐨刴ethod鏄惁鍙悓鏃舵槸static,鏄惁鍙悓鏃舵槸native锛屾槸鍚﹀彲鍚屾椂鏄痵ynchronized?閮戒笉鑳�

38銆佹暟缁勬湁娌℃湁length()杩欎釜鏂规硶? String鏈夋病鏈塴ength()杩欎釜鏂规硶锛�鏁扮粍娌℃湁length()杩欎釜鏂规硶锛屾湁length鐨勫睘鎬с�係tring鏈夋湁length()杩欎釜鏂规硶銆�

39銆丼et閲岀殑鍏冪礌鏄笉鑳介噸澶嶇殑锛岄偅涔堢敤浠�涔堟柟娉曟潵鍖哄垎閲嶅涓庡惁鍛�? 鏄敤==杩樻槸equals()? 瀹冧滑鏈変綍鍖哄埆?

Set閲岀殑鍏冪礌鏄笉鑳介噸澶嶇殑锛岄偅涔堢敤iterator()鏂规硶鏉ュ尯鍒嗛噸澶嶄笌鍚︺�俥quals()鏄垽璇讳袱涓猄et鏄惁鐩哥瓑銆俥quals()鍜�==鏂规硶鍐冲畾寮曠敤鍊兼槸鍚︽寚鍚戝悓涓�瀵硅薄equals()鍦ㄧ被涓瑕嗙洊锛屼负鐨勬槸褰撲袱涓垎绂荤殑瀵硅薄鐨勫唴瀹瑰拰绫诲瀷鐩搁厤鐨勮瘽锛岃繑鍥炵湡鍊笺��

40銆佹瀯閫犲櫒Constructor鏄惁鍙override?鏋勯�犲櫒Constructor涓嶈兘琚户鎵匡紝鍥犳涓嶈兘閲嶅啓Overriding锛屼絾鍙互琚噸杞絆verloading銆�

41銆佹槸鍚﹀彲浠ョ户鎵縎tring绫�?String绫绘槸final绫绘晠涓嶅彲浠ョ户鎵裤��

42銆乻wtich鏄惁鑳戒綔鐢ㄥ湪byte涓婏紝鏄惁鑳戒綔鐢ㄥ湪long涓婏紝鏄惁鑳戒綔鐢ㄥ湪String涓�?switch锛坋xpr1锛変腑锛宔xpr1鏄竴涓暣鏁拌〃杈惧紡銆傚洜姝や紶閫掔粰 switch 鍜� case 璇彞鐨勫弬鏁板簲璇ユ槸 int銆� short銆� char 鎴栬�� byte銆俵ong,string 閮戒笉鑳戒綔鐢ㄤ簬swtich銆�

43銆乼ry {}閲屾湁涓�涓猺eturn璇彞锛岄偅涔堢揣璺熷湪杩欎釜try鍚庣殑finally {}閲岀殑code浼氫笉浼氳鎵ц锛屼粈涔堟椂鍊欒鎵ц锛屽湪return鍓嶈繕鏄悗?浼氭墽琛岋紝鍦╮eturn鍓嶆墽琛屻��

44銆佺紪绋嬮: 鐢ㄦ渶鏈夋晥鐜囩殑鏂规硶绠楀嚭2涔樹互8绛夋柤鍑�?2 << 3

45銆佷袱涓璞″�肩浉鍚�(x.equals(y) == true)锛屼絾鍗村彲鏈変笉鍚岀殑hash code锛岃繖鍙ヨ瘽瀵逛笉瀵�?涓嶅锛屾湁鐩稿悓鐨刪ash code銆�

46銆佸綋涓�涓璞¤褰撲綔鍙傛暟浼犻�掑埌涓�涓柟娉曞悗锛屾鏂规硶鍙敼鍙樿繖涓璞＄殑灞炴�э紝骞跺彲杩斿洖鍙樺寲鍚庣殑缁撴灉锛岄偅涔堣繖閲屽埌搴曟槸鍊间紶閫掕繕鏄紩鐢ㄤ紶閫�?鏄�间紶閫掋�侸ava 缂栫▼璇█鍙湁鍊间紶閫掑弬鏁般�傚綋涓�涓璞″疄渚嬩綔涓轰竴涓弬鏁拌浼犻�掑埌鏂规硶涓椂锛屽弬鏁扮殑鍊煎氨鏄璇ュ璞＄殑寮曠敤銆傚璞＄殑鍐呭鍙互鍦ㄨ璋冪敤鐨勬柟娉曚腑鏀瑰彉锛屼絾瀵硅薄鐨勫紩鐢ㄦ槸姘歌繙涓嶄細鏀瑰彉鐨勩��

47銆佸綋涓�涓嚎绋嬭繘鍏ヤ竴涓璞＄殑涓�涓猻ynchronized鏂规硶鍚庯紝鍏跺畠绾跨▼鏄惁鍙繘鍏ユ瀵硅薄鐨勫叾瀹冩柟娉�?

涓嶈兘锛屼竴涓璞＄殑涓�涓猻ynchronized鏂规硶鍙兘鐢变竴涓嚎绋嬭闂��

48銆佺紪绋嬮: 鍐欎竴涓猄ingleton鍑烘潵銆�

Singleton妯″紡涓昏浣滅敤鏄繚璇佸湪Java搴旂敤绋嬪簭涓紝涓�涓被Class鍙湁涓�涓疄渚嬪瓨鍦ㄣ�備竴鑸琒ingleton妯″紡閫氬父鏈夊嚑绉嶇褰㈠紡:绗竴绉嶅舰寮�: 瀹氫箟涓�涓被锛屽畠鐨勬瀯閫犲嚱鏁颁负private鐨勶紝瀹冩湁涓�涓猻tatic鐨刾rivate鐨勮绫诲彉閲忥紝鍦ㄧ被鍒濆鍖栨椂瀹炰緥璇濓紝閫氳繃涓�涓猵ublic鐨刧etInstance鏂规硶鑾峰彇瀵瑰畠鐨勫紩鐢�,缁ц�岃皟鐢ㄥ叾涓殑鏂规硶銆俻ublic class Singleton {private Singleton(){}private static Singleton instance = new Singleton();聽 public static Singleton getInstance() {聽 return instance; 銆�銆�}}绗簩绉嶅舰寮�:public class Singleton {private static Singleton instance = null;聽 public static synchronized Singleton getInstance() {銆�if (instance==null)銆�instance锛漬ew Singleton();

return instance; 銆�銆�}}鍏朵粬褰㈠紡:聽 瀹氫箟涓�涓被锛屽畠鐨勬瀯閫犲嚱鏁颁负private鐨勶紝鎵�鏈夋柟娉曚负static鐨勩�備竴鑸涓虹涓�绉嶅舰寮忚鏇村姞瀹夊叏浜�

49銆丣ava鐨勬帴鍙ｅ拰C++鐨勮櫄绫荤殑鐩稿悓鍜屼笉鍚屽銆�

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getCookies()锛氳繑鍥炲鎴风鐨勬墍鏈塁ookie瀵硅薄锛岀粨鏋滄槸涓�涓狢ookie鏁扮粍

getCharacterEncoding()锛氳繑鍥炶姹備腑鐨勫瓧绗︾紪鐮佹柟寮�

getContentLength()锛氳繑鍥炶姹傜殑Body鐨勯暱搴�

getHeader(String name)锛氳幏寰桯TTP鍗忚瀹氫箟鐨勬枃浠跺ご淇℃伅

getHeaders(String name)锛氳繑鍥炴寚瀹氬悕瀛楃殑request Header鐨勬墍鏈夊�硷紝缁撴灉鏄竴涓灇涓剧殑瀹炰緥

getHeaderNames()锛氳繑鍥炴墍浠equest Header鐨勫悕瀛楋紝缁撴灉鏄竴涓灇涓剧殑瀹炰緥

getInputStream()锛氳繑鍥炶姹傜殑杈撳叆娴侊紝鐢ㄤ簬鑾峰緱璇锋眰涓殑鏁版嵁

getMethod()锛氳幏寰楀鎴风鍚戞湇鍔″櫒绔紶閫佹暟鎹殑鏂规硶

getParameter(String name)锛氳幏寰楀鎴风浼犻�佺粰鏈嶅姟鍣ㄧ鐨勬湁name鎸囧畾鐨勫弬鏁板��

getParameterNames()锛氳幏寰楀鎴风浼犻�佺粰鏈嶅姟鍣ㄧ鐨勬墍鏈夊弬鏁扮殑鍚嶅瓧锛岀粨鏋滄槸涓�涓灇涓剧殑瀹炰緥

getParameterValues(String name)锛氳幏寰楁湁name鎸囧畾鐨勫弬鏁扮殑鎵�鏈夊��

getProtocol()锛氳幏鍙栧鎴风鍚戞湇鍔″櫒绔紶閫佹暟鎹墍渚濇嵁鐨勫崗璁悕绉�

getQueryString()锛氳幏寰楁煡璇㈠瓧绗︿覆

getRequestURI()锛氳幏鍙栧彂鍑鸿姹傚瓧绗︿覆鐨勫鎴风鍦板潃

getRemoteAddr()锛氳幏鍙栧鎴风鐨処P鍦板潃

getRemoteHost()锛氳幏鍙栧鎴风鐨勫悕瀛�

getSession([Boolean create])锛氳繑鍥炲拰璇锋眰鐩稿叧Session

getServerName()锛氳幏鍙栨湇鍔″櫒鐨勫悕瀛�

getServletPath()锛氳幏鍙栧鎴风鎵�璇锋眰鐨勮剼鏈枃浠剁殑璺緞

getServerPort()锛氳幏鍙栨湇鍔″櫒鐨勭鍙ｅ彿

removeAttribute(String name)锛氬垹闄よ姹備腑鐨勪竴涓睘鎬�

67銆丣2EE鏄妧鏈繕鏄钩鍙拌繕鏄鏋讹紵J2EE鏈韩鏄竴涓爣鍑嗭紝涓�涓负浼佷笟鍒嗗竷寮忓簲鐢ㄧ殑寮�鍙戞彁渚涚殑鏍囧噯骞冲彴銆�

J2EE涔熸槸涓�涓鏋讹紝鍖呮嫭JDBC銆丣NDI銆丷MI銆丣MS銆丒JB銆丣TA绛夋妧鏈��

68銆佹垜浠湪web搴旂敤寮�鍙戣繃绋嬩腑缁忓父閬囧埌杈撳嚭鏌愮缂栫爜鐨勫瓧绗︼紝濡俰so8859-1绛夛紝濡備綍杈撳嚭涓�涓煇绉嶇紪鐮佺殑瀛楃涓诧紵

Public String translate (String str) {String tempStr = "";try { tempStr = new String(str.getBytes("ISO-8859-1"), "GBK");tempStr = tempStr.trim();} catch (Exception e) {聽 System.err.println(e.getMessage());聽 } return tempStr;聽 }

69銆佺畝杩伴�昏緫鎿嶄綔(&,|,^)涓庢潯浠舵搷浣�(&&,||)鐨勫尯鍒��鍖哄埆涓昏绛斾袱鐐癸細a.鏉′欢鎿嶄綔鍙兘鎿嶄綔甯冨皵鍨嬬殑,鑰岄�昏緫鎿嶄綔涓嶄粎鍙互鎿嶄綔甯冨皵鍨�,鑰屼笖鍙互鎿嶄綔鏁板�煎瀷b.閫昏緫鎿嶄綔涓嶄細浜х敓鐭矾

70銆乆ML鏂囨。瀹氫箟鏈夊嚑绉嶅舰寮忥紵瀹冧滑涔嬮棿鏈変綍鏈川鍖哄埆锛熻В鏋怷ML鏂囨。鏈夊摢鍑犵鏂瑰紡锛�

a: 涓ょ褰㈠紡 dtd聽 schema锛宐: 鏈川鍖哄埆:schema鏈韩鏄痻ml鐨勶紝鍙互琚玐ML瑙ｆ瀽鍣ㄨВ鏋�(杩欎篃鏄粠DTD涓婂彂灞晄chema鐨勬牴鏈洰鐨�)锛宑:鏈塂OM,SAX,STAX绛壜� DOM:澶勭悊澶у瀷鏂囦欢鏃跺叾鎬ц兘涓嬮檷鐨勯潪甯稿帀瀹炽�傝繖涓棶棰樻槸鐢盌OM鐨勬爲缁撴瀯鎵�閫犳垚鐨勶紝杩欑缁撴瀯鍗犵敤鐨勫唴瀛樿緝澶氾紝鑰屼笖DOM蹇呴』鍦ㄨВ鏋愭枃浠朵箣鍓嶆妸鏁翠釜鏂囨。瑁呭叆鍐呭瓨,閫傚悎瀵筙ML鐨勯殢鏈鸿闂� SAX:涓嶇幇浜嶥OM,SAX鏄簨浠堕┍鍔ㄥ瀷鐨刋ML瑙ｆ瀽鏂瑰紡銆傚畠椤哄簭璇诲彇XML鏂囦欢锛屼笉闇�瑕佷竴娆″叏閮ㄨ杞芥暣涓枃浠躲�傚綋閬囧埌鍍忔枃浠跺紑澶达紝鏂囨。缁撴潫锛屾垨鑰呮爣绛惧紑澶翠笌鏍囩缁撴潫鏃讹紝瀹冧細瑙﹀彂涓�涓簨浠讹紝鐢ㄦ埛閫氳繃鍦ㄥ叾鍥炶皟浜嬩欢涓啓鍏ュ鐞嗕唬鐮佹潵澶勭悊XML鏂囦欢锛岄�傚悎瀵筙ML鐨勯『搴忚闂甋TAX:Streaming API for XML (StAX)

71銆佺畝杩皊ynchronized鍜宩ava.util.concurrent.locks.Lock鐨勫紓鍚� 锛�

涓昏鐩稿悓鐐癸細Lock鑳藉畬鎴恠ynchronized鎵�瀹炵幇鐨勬墍鏈夊姛鑳戒富瑕佷笉鍚岀偣锛歀ock鏈夋瘮synchronized鏇寸簿纭殑绾跨▼璇箟鍜屾洿濂界殑鎬ц兘銆俿ynchronized浼氳嚜鍔ㄩ噴鏀鹃攣锛岃�孡ock涓�瀹氳姹傜▼搴忓憳鎵嬪伐閲婃斁锛屽苟涓斿繀椤诲湪finally浠庡彞涓噴鏀俱��

72銆丒JB鐨勮鑹插拰涓変釜瀵硅薄

涓�涓畬鏁寸殑鍩轰簬EJB鐨勫垎甯冨紡璁＄畻缁撴瀯鐢卞叚涓鑹茬粍鎴愶紝杩欏叚涓鑹插彲浠ョ敱涓嶅悓鐨勫紑鍙戝晢鎻愪緵锛屾瘡涓鑹叉墍浣滅殑宸ヤ綔蹇呴』閬靛惊Sun鍏徃鎻愪緵鐨凟JB瑙勮寖锛屼互淇濊瘉褰兼涔嬮棿鐨勫吋瀹规�с�傝繖鍏釜瑙掕壊鍒嗗埆鏄疎JB缁勪欢寮�鍙戣�咃紙Enterprise Bean Provider锛� 銆佸簲鐢ㄧ粍鍚堣�咃紙Application Assembler锛夈�侀儴缃茶�咃紙Deployer锛夈�丒JB 鏈嶅姟鍣ㄦ彁渚涜�咃紙EJB Server Provider锛夈�丒JB 瀹瑰櫒鎻愪緵鑰咃紙EJB Container Provider锛夈�佺郴缁熺鐞嗗憳锛圫ystem Administrator锛変笁涓璞℃槸Remote锛圠ocal锛夋帴鍙ｃ�丠ome锛圠ocalHome锛夋帴鍙ｏ紝Bean绫�

73銆丒JB瀹瑰櫒鎻愪緵鐨勬湇鍔�涓昏鎻愪緵澹版槑鍛ㄦ湡绠＄悊銆佷唬鐮佷骇鐢熴�佹寔缁�х鐞嗐�佸畨鍏ㄣ�佷簨鍔＄鐞嗐�侀攣鍜屽苟鍙戣绠＄悊绛夋湇鍔°��

74銆丒JB瑙勮寖瑙勫畾EJB涓姝㈢殑鎿嶄綔鏈夊摢浜涳紵1.涓嶈兘鎿嶄綔绾跨▼鍜岀嚎绋婣PI(绾跨▼API鎸囬潪绾跨▼瀵硅薄鐨勬柟娉曞notify,wait绛�)锛�2.涓嶈兘鎿嶄綔awt锛�3.涓嶈兘瀹炵幇鏈嶅姟鍣ㄥ姛鑳斤紝4.涓嶈兘瀵归潤鎬佸睘鐢熷瓨鍙栵紝5.涓嶈兘浣跨敤IO鎿嶄綔鐩存帴瀛樺彇鏂囦欢绯荤粺锛�6.涓嶈兘鍔犺浇鏈湴搴�.锛�7.涓嶈兘灏唗his浣滀负鍙橀噺鍜岃繑鍥烇紝8.涓嶈兘寰幆璋冪敤銆�

75銆乺emote鎺ュ彛鍜宧ome鎺ュ彛涓昏浣滅敤remote鎺ュ彛瀹氫箟浜嗕笟鍔℃柟娉曪紝鐢ㄤ簬EJB瀹㈡埛绔皟鐢ㄤ笟鍔℃柟娉曘�俬ome鎺ュ彛鏄疎JB宸ュ巶鐢ㄤ簬鍒涘缓鍜岀Щ闄ゆ煡鎵綞JB瀹炰緥

76銆乥ean 瀹炰緥鐨勭敓鍛藉懆鏈�瀵逛簬Stateless Session Bean銆丒ntity Bean銆丮essage Driven Bean涓�鑸瓨鍦ㄧ紦鍐叉睜绠＄悊锛岃�屽浜嶦ntity Bean鍜孲tatefull Session Bean瀛樺湪Cache绠＄悊锛岄�氬父鍖呭惈鍒涘缓瀹炰緥锛岃缃笂涓嬫枃銆佸垱寤篍JB Object锛坈reate锛夈�佷笟鍔℃柟娉曡皟鐢ㄣ�乺emove绛夎繃绋嬶紝瀵逛簬瀛樺湪缂撳啿姹犵鐞嗙殑Bean锛屽湪create涔嬪悗瀹炰緥骞朵笉浠庡唴瀛樻竻闄わ紝鑰屾槸閲囩敤缂撳啿姹犺皟搴︽満鍒朵笉鏂噸鐢ㄥ疄渚嬶紝鑰屽浜庡瓨鍦–ache绠＄悊鐨凚ean鍒欓�氳繃婵�娲诲拰鍘绘縺娲绘満鍒朵繚鎸丅ean鐨勭姸鎬佸苟闄愬埗鍐呭瓨涓疄渚嬫暟閲忋��

77銆丒JB鐨勬縺娲绘満鍒�浠tateful Session Bean 涓轰緥锛氬叾Cache澶у皬鍐冲畾浜嗗唴瀛樹腑鍙互鍚屾椂瀛樺湪鐨凚ean瀹炰緥鐨勬暟閲忥紝鏍规嵁MRU鎴朜RU绠楁硶锛屽疄渚嬪湪婵�娲诲拰鍘绘縺娲荤姸鎬佷箣闂磋縼绉伙紝婵�娲绘満鍒舵槸褰撳鎴风璋冪敤鏌愪釜EJB瀹炰緥涓氬姟鏂规硶鏃讹紝濡傛灉瀵瑰簲EJB Object鍙戠幇鑷繁娌℃湁缁戝畾瀵瑰簲鐨凚ean瀹炰緥鍒欎粠鍏跺幓婵�娲籅ean瀛樺偍涓紙閫氳繃搴忓垪鍖栨満鍒跺瓨鍌ㄥ疄渚嬶級鍥炲锛堟縺娲伙級姝ゅ疄渚嬨�傜姸鎬佸彉杩佸墠浼氳皟鐢ㄥ搴旂殑ejbActive鍜宔jbPassivate鏂规硶銆�

78銆丒JB鐨勫嚑绉嶇被鍨�浼氳瘽锛圫ession锛塀ean 锛屽疄浣擄紙Entity锛塀ean 娑堟伅椹卞姩鐨勶紙Message Driven锛塀ean聽 锛涗細璇滲ean鍙堝彲鍒嗕负鏈夌姸鎬侊紙Stateful锛夊拰鏃犵姸鎬侊紙Stateless锛変袱绉嶏紱瀹炰綋Bean鍙垎涓築ean绠＄悊鐨勬寔缁�э紙BMP锛夊拰瀹瑰櫒绠＄悊鐨勬寔缁�э紙CMP锛変袱绉�

79銆佸鏈嶇璋冪敤EJB瀵硅薄鐨勫嚑涓熀鏈楠�璁剧疆JNDI鏈嶅姟宸ュ巶浠ュ強JNDI鏈嶅姟鍦板潃绯荤粺灞炴�э紝鏌ユ壘Home鎺ュ彛锛屼粠Home鎺ュ彛璋冪敤Create鏂规硶鍒涘缓Remote鎺ュ彛锛岄�氳繃Remote鎺ュ彛璋冪敤鍏朵笟鍔℃柟娉曘��

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81銆佸浣曡瀹氱殑weblogic鐨勭儹鍚姩妯″紡(寮�鍙戞ā寮�)涓庝骇鍝佸彂甯冩ā寮�?鍙互鍦ㄧ鐞嗘帶鍒跺彴涓慨鏀瑰搴旀湇鍔″櫒鐨勫惎鍔ㄦā寮忎负寮�鍙戞垨浜у搧妯″紡涔嬩竴銆傛垨鑰呬慨鏀规湇鍔＄殑鍚姩鏂囦欢鎴栬�卌ommenv鏂囦欢锛屽鍔爏et PRODUCTION_MODE=true銆�

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