锘??xml version="1.0" encoding="utf-8" standalone="yes"?>亚洲国产精品久久久久婷婷老年,亚洲精品永久www忘忧草,中文字幕久久亚洲一区http://m.tkk7.com/pts/category/13438.htmlediter by sunzh-cnTue, 27 Feb 2007 18:45:44 GMTTue, 27 Feb 2007 18:45:44 GMT60teach yourself jsp with tomcat in 24hhttp://m.tkk7.com/pts/articles/60065.htmlptsptsTue, 29 Mar 2005 22:29:00 GMThttp://m.tkk7.com/pts/articles/60065.htmlhttp://m.tkk7.com/pts/comments/60065.htmlhttp://m.tkk7.com/pts/articles/60065.html#Feedback0http://m.tkk7.com/pts/comments/commentRss/60065.htmlhttp://m.tkk7.com/pts/services/trackbacks/60065.html浠?鏈?9鏃ュ紑濮嬬湅錛屽彂鐜頒綔鑰呭啓鐨勫緢涓嶉敊錛岃娉ㄦ剰鐨勫湴鏂瑰拰閲嶇偣鍐呭閮芥湁寮鴻皟錛屾枃瀛椾篃姣旇緝瀹規槗鎳傦紝涓鏃舵湁浜嗙炕璇戝嚭鏉ョ殑鎯蟲硶錛岀湅鏃墮棿浜嗗惂銆?/p>

29鏃?2錛?2TO:h2.using the request object



pts 2005-03-30 06:29 鍙戣〃璇勮
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鍙互鏀瑰杽 eclipse 鏁堣兘鐨?plugin http://m.tkk7.com/pts/articles/60069.htmlptsptsThu, 17 Mar 2005 23:25:00 GMThttp://m.tkk7.com/pts/articles/60069.htmlhttp://m.tkk7.com/pts/comments/60069.htmlhttp://m.tkk7.com/pts/articles/60069.html#Feedback0http://m.tkk7.com/pts/comments/commentRss/60069.htmlhttp://m.tkk7.com/pts/services/trackbacks/60069.html閫欏?plugin 鍙仛 KeepResident

澧炲姞鏁堣兘鐨勫師鐞嗕富瑕佹槸鍒╃敤鍏╁?Windows API - SetProcessWorkingSetSize 鑸?VirtualLock (鎵浠ュ彧閬╃敤鏂?Windows 騫沖彴)錛岃畵 Windows 淇濈暀鏇村鐨勮鎲墮珨緄?BR>eclipse 鐨?java process銆?BR>
鑷繁瑭︾敤鐨勭祼鏋滐紝閫熷害鐪熺殑鏈夎畩蹇紝鍒囨彌闋侀潰 lag 鐨勬儏褰㈠ソ寰堝錛屼互寰灝?eclipse
瑕栫獥鏈灝忓寲寰岃鎲墮珨鏈冭閲嬫斁錛屾墍浠ラ倓鍘熻紿楀氨鏈?delay錛岀従鍦ㄤ篃涓嶆渻浜?(鍥犵偤璦樻喍楂斾笉鏈冮噵鏀撅紝濡傛灉浣犲嬀閬鎬簡VirtualLock 鐨勯伕闋呯殑瑭?銆?BR>
浣跨敤鍓嶆垜鐨?eclipse 鐨?java process (javaw.exe) 鏈澶?5MB錛屼絾鏄?VM size 涓婄櫨 MB錛涗嬌鐢ㄥ緦鐝懼湪 javaw.exe 鎵浣跨敤鐨勮鎲墮珨綞寔鍦?70~100MB 涔嬮枔錛屽皪鎴戦欏彴闆昏叇鐨勮鎲墮珨(768MB)渚嗚閭勭畻閬庡緱鍘匯傚畼鏂圭殑鏂囦歡寤鴻鏈灝忓艱ō瀹氬湪 100 MB錛屾渶澶у?250 MB 宸﹀彸銆?BR>
鑷蟲柤絀╁畾鎬э紝鐩墠鎴戞槸闁嬪暉 VirtualLock錛屾渶灝忓?128錛屾渶澶у?256錛屽浜嗗ぇ姒?BR>浜斿皬鏅傜殑紼嬪紡錛岀洰鍓嶆矑鏈夐亣鍒頒粈楹煎晱欏岋紝浣嗘槸鎴戠殑 project 涓嶅錛屼篃娌掓湁瀹夎
鍏朵粬鐨?plugin錛屾墍浠ュ儏渚涘弮鑰冦?BR>
濡傛灉浣犵殑闆昏叇璦樻喍楂旇凍澶犵殑瑭憋紝閫欏?plugin 鎴栬ū鍙互鍦?eclipse 鐨勬晥鑳戒笂灝嶄綘鏈夋墍騫姪銆?/SPAN>

鏇村鐨凱lugin鍦細
http://www.eclipse-plugins.info/eclipse/index.jsp



pts 2005-03-18 07:25 鍙戣〃璇勮
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jdk1.5 winhelp鏍煎紡http://m.tkk7.com/pts/articles/60070.htmlptsptsTue, 15 Mar 2005 18:49:00 GMThttp://m.tkk7.com/pts/articles/60070.htmlhttp://m.tkk7.com/pts/comments/60070.htmlhttp://m.tkk7.com/pts/articles/60070.html#Feedback0http://m.tkk7.com/pts/comments/commentRss/60070.htmlhttp://m.tkk7.com/pts/services/trackbacks/60070.htmlFrom: http://www.allimant.org/javadoc/indexe.html

down link:
http://javadocs.planetmirror.com/dist/jdk150-wh.zip



pts 2005-03-16 02:49 鍙戣〃璇勮
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緇忓吀java闂,浣犺兘絳斿嚭鍑犱釜?http://m.tkk7.com/pts/articles/60077.htmlptsptsThu, 03 Feb 2005 21:51:00 GMThttp://m.tkk7.com/pts/articles/60077.htmlhttp://m.tkk7.com/pts/comments/60077.htmlhttp://m.tkk7.com/pts/articles/60077.html#Feedback0http://m.tkk7.com/pts/comments/commentRss/60077.htmlhttp://m.tkk7.com/pts/services/trackbacks/60077.html

緇忓吀java闂,浣犺兘絳斿嚭鍑犱釜? 鏉ヨ瘯璇曠湅鍚э紝涓鍏辨湁32閬撻鐩摝锝烇綖^_^

絎竴錛岃皥璋坒inal, finally, finalize鐨勫尯鍒?/strong>

銆銆final鈥斾慨楗扮錛堝叧閿瓧錛夊鏋滀竴涓被琚0鏄庝負final錛屾剰鍛崇潃瀹冧笉鑳藉啀媧劇敓鍑烘柊鐨勫瓙綾伙紝涓嶈兘浣滀負鐖剁被琚戶鎵褲傚洜姝や竴涓被涓嶈兘鏃㈣澹版槑涓?abstract鐨勶紝鍙堣澹版槑涓篺inal鐨勩傚皢鍙橀噺鎴栨柟娉曞0鏄庝負final錛屽彲浠ヤ繚璇佸畠浠湪浣跨敤涓笉琚敼鍙樸傝澹版槑涓篺inal鐨勫彉閲忓繀欏誨湪澹版槑鏃剁粰瀹氬垵鍊鹼紝鑰屽湪浠ュ悗鐨勫紩鐢ㄤ腑鍙兘璇誨彇錛屼笉鍙慨鏀廣傝澹版槑涓篺inal鐨勬柟娉曚篃鍚屾牱鍙兘浣跨敤錛屼笉鑳介噸杞姐?

銆銆finally鈥斿啀寮傚父澶勭悊鏃舵彁渚?finally 鍧楁潵鎵ц浠諱綍娓呴櫎鎿嶄綔銆傚鏋滄姏鍑轟竴涓紓甯革紝閭d箞鐩稿尮閰嶇殑 catch 瀛愬彞灝變細鎵ц錛岀劧鍚庢帶鍒跺氨浼氳繘鍏?finally 鍧楋紙濡傛灉鏈夌殑璇濓級銆?

銆銆finalize鈥旀柟娉曞悕銆侸ava 鎶鏈厑璁鎬嬌鐢?finalize() 鏂規硶鍦ㄥ瀮鍦炬敹闆嗗櫒灝嗗璞′粠鍐呭瓨涓竻闄ゅ嚭鍘諱箣鍓嶅仛蹇呰鐨勬竻鐞嗗伐浣溿傝繖涓柟娉曟槸鐢卞瀮鍦炬敹闆嗗櫒鍦ㄧ‘瀹氳繖涓璞℃病鏈夎寮曠敤鏃跺榪欎釜瀵硅薄璋冪敤鐨勩傚畠鏄湪 Object 綾諱腑瀹氫箟鐨勶紝鍥犳鎵鏈夌殑綾婚兘緇ф壙浜嗗畠銆傚瓙綾昏鐩?finalize() 鏂規硶浠ユ暣鐞嗙郴緇熻祫婧愭垨鑰呮墽琛屽叾浠栨竻鐞嗗伐浣溿俧inalize() 鏂規硶鏄湪鍨冨溇鏀墮泦鍣ㄥ垹闄ゅ璞′箣鍓嶅榪欎釜瀵硅薄璋冪敤鐨勩?

銆絎簩錛孉nonymous Inner Class (鍖垮悕鍐呴儴綾? 鏄惁鍙互extends(緇ф壙)鍏跺畠綾伙紝鏄惁鍙互implements(瀹炵幇)interface(鎺ュ彛)?

銆銆鍖垮悕鐨勫唴閮ㄧ被鏄病鏈夊悕瀛楃殑鍐呴儴綾匯備笉鑳絜xtends(緇ф壙) 鍏跺畠綾伙紝浣嗕竴涓唴閮ㄧ被鍙互浣滀負涓涓帴鍙o紝鐢卞彟涓涓唴閮ㄧ被瀹炵幇銆?

銆銆絎笁錛孲tatic Nested Class 鍜?Inner Class鐨勪笉鍚岋紝璇村緱瓚婂瓚婂ソ(闈㈣瘯棰樻湁鐨勫緢絎肩粺)銆?/strong>

銆銆Nested Class 錛堜竴鑸槸C++鐨勮娉曪級錛孖nner Class (涓鑸槸JAVA鐨勮娉?銆侸ava鍐呴儴綾諱笌C++宓屽綾繪渶澶х殑涓嶅悓灝卞湪浜庢槸鍚︽湁鎸囧悜澶栭儴鐨勫紩鐢ㄤ笂銆傚叿浣撳彲瑙乭ttp: //www.frontfree.net/articles/services/view.asp?id=704&page=1

銆銆娉細 闈欐佸唴閮ㄧ被錛圛nner Class錛夋剰鍛崇潃1鍒涘緩涓涓猻tatic鍐呴儴綾葷殑瀵硅薄錛屼笉闇瑕佷竴涓閮ㄧ被瀵硅薄錛?涓嶈兘浠庝竴涓猻tatic鍐呴儴綾葷殑涓涓璞¤闂竴涓閮ㄧ被瀵硅薄

銆銆絎洓錛?amp;鍜?amp;&鐨勫尯鍒?/strong>

銆銆&鏄綅榪愮畻絎︺?amp;&鏄竷灝旈昏緫榪愮畻絎︺?

銆銆絎簲錛孒ashMap鍜孒ashtable鐨勫尯鍒?/strong>

銆銆閮藉睘浜嶮ap鎺ュ彛鐨勭被錛屽疄鐜頒簡灝嗘儫涓閿槧灝勫埌鐗瑰畾鐨勫間笂銆?
銆銆HashMap 綾繪病鏈夊垎綾繪垨鑰呮帓搴忋傚畠鍏佽涓涓?null 閿拰澶氫釜 null 鍊箋?
銆銆Hashtable 綾諱技浜?HashMap錛屼絾鏄笉鍏佽 null 閿拰 null 鍊箋傚畠涔熸瘮 HashMap 鎱紝鍥犱負瀹冩槸鍚屾鐨勩?

銆絎叚錛孋ollection 鍜?Collections鐨勫尯鍒?/strong>

銆銆Collections鏄釜java.util涓嬬殑綾伙紝瀹冨寘鍚湁鍚勭鏈夊叧闆嗗悎鎿嶄綔鐨勯潤鎬佹柟娉曘?
銆銆Collection鏄釜java.util涓嬬殑鎺ュ彛錛屽畠鏄悇縐嶉泦鍚堢粨鏋勭殑鐖舵帴鍙c?

銆銆絎竷錛屼粈涔堟椂鍊欑敤assert銆?/strong>

銆銆鏂█鏄竴涓寘鍚竷灝旇〃杈懼紡鐨勮鍙ワ紝鍦ㄦ墽琛岃繖涓鍙ユ椂鍋囧畾璇ヨ〃杈懼紡涓?true銆傚鏋滆〃杈懼紡璁$畻涓?false錛岄偅涔堢郴緇熶細鎶ュ憡涓涓?Assertionerror銆傚畠鐢ㄤ簬璋冭瘯鐩殑錛?


銆銆assert(a > 0); // throws an Assertionerror if a <= 0

銆銆鏂█鍙互鏈変袱縐嶅艦寮忥細
銆銆assert Expression1 ;
銆銆assert Expression1 : Expression2 ;
銆銆Expression1 搴旇鎬繪槸浜х敓涓涓竷灝斿箋?
銆銆Expression2 鍙互鏄緱鍑轟竴涓肩殑浠繪剰琛ㄨ揪寮忋傝繖涓肩敤浜庣敓鎴愭樉紺烘洿澶氳皟璇曚俊鎭殑 String 娑堟伅銆?
銆銆鏂█鍦ㄩ粯璁ゆ儏鍐典笅鏄鐢ㄧ殑銆傝鍦ㄧ紪璇戞椂鍚敤鏂█錛岄渶瑕佷嬌鐢?source 1.4 鏍囪錛?
銆銆javac -source 1.4 Test.java
銆銆瑕佸湪榪愯鏃跺惎鐢ㄦ柇璦錛屽彲浣跨敤 -enableassertions 鎴栬?-ea 鏍囪銆?
銆銆瑕佸湪榪愯鏃墮夋嫨紱佺敤鏂█錛屽彲浣跨敤 -da 鎴栬?-disableassertions 鏍囪銆?
銆銆瑕佺郴緇熺被涓惎鐢ㄦ柇璦錛屽彲浣跨敤 -esa 鎴栬?-dsa 鏍囪銆傝繕鍙互鍦ㄥ寘鐨勫熀紜涓婂惎鐢ㄦ垨鑰呯鐢ㄦ柇璦銆?

銆銆鍙互鍦ㄩ璁℃甯告儏鍐典笅涓嶄細鍒拌揪鐨勪換浣曚綅緗笂鏀劇疆鏂█銆傛柇璦鍙互鐢ㄤ簬楠岃瘉浼犻掔粰縐佹湁鏂規硶鐨勫弬鏁般備笉榪囷紝鏂█涓嶅簲璇ョ敤浜庨獙璇佷紶閫掔粰鍏湁鏂規硶鐨勫弬鏁幫紝鍥犱負涓嶇鏄惁鍚敤浜嗘柇璦錛屽叕鏈夋柟娉曢兘蹇呴』媯鏌ュ叾鍙傛暟銆備笉榪囷紝鏃㈠彲浠ュ湪鍏湁鏂規硶涓紝涔熷彲浠ュ湪闈炲叕鏈夋柟娉曚腑鍒╃敤鏂█嫻嬭瘯鍚庣疆鏉′歡銆傚彟澶栵紝鏂█涓嶅簲璇ヤ互浠諱綍鏂瑰紡鏀瑰彉紼嬪簭鐨勭姸鎬併?

銆銆絎叓錛孏C鏄粈涔? 涓轟粈涔堣鏈塆C? (鍩虹)銆?

銆銆GC鏄瀮鍦炬敹闆嗗櫒銆侸ava 紼嬪簭鍛樹笉鐢ㄦ媴蹇冨唴瀛樼鐞嗭紝鍥犱負鍨冨溇鏀墮泦鍣ㄤ細鑷姩榪涜綆$悊銆傝璇鋒眰鍨冨溇鏀墮泦錛屽彲浠ヨ皟鐢ㄤ笅闈㈢殑鏂規硶涔嬩竴錛?


銆銆System.gc()
銆銆Runtime.getRuntime().gc()

銆銆絎節錛孲tring s = new String("xyz");鍒涘緩浜嗗嚑涓猄tring Object?

銆銆涓や釜瀵硅薄錛屼竴涓槸"xyx",涓涓槸鎸囧悜"xyx"鐨勫紩鐢ㄥ璞銆?

銆銆絎崄錛孧ath.round(11.5)絳夋柤澶氬皯? Math.round(-11.5)絳夋柤澶氬皯?
銆銆
銆銆Math.round(11.5)榪斿洖錛坙ong錛?2錛孧ath.round(-11.5)榪斿洖錛坙ong錛?11;

銆銆絎崄涓錛宻hort s1 = 1; s1 = s1 + 1;鏈変粈涔堥敊? short s1 = 1; s1 += 1;鏈変粈涔堥敊?

銆銆short s1 = 1; s1 = s1 + 1;鏈夐敊錛宻1鏄痵hort鍨嬶紝s1+1鏄痠nt鍨?涓嶈兘鏄懼紡杞寲涓簊hort鍨嬨傚彲淇敼涓簊1 =(short)(s1 + 1) 銆俿hort s1 = 1; s1 += 1姝g‘銆?

銆銆絎崄浜岋紝sleep() 鍜?wait() 鏈変粈涔堝尯鍒? 鎼炵嚎紼嬬殑鏈鐖?/strong>

銆銆sleep()鏂規硶鏄嬌綰跨▼鍋滄涓孌墊椂闂寸殑鏂規硶銆傚湪sleep 鏃墮棿闂撮殧鏈熸弧鍚庯紝綰跨▼涓嶄竴瀹氱珛鍗蟲仮澶嶆墽琛屻傝繖鏄洜涓哄湪閭d釜鏃跺埢錛屽叾瀹冪嚎紼嬪彲鑳芥鍦ㄨ繍琛岃屼笖娌℃湁琚皟搴︿負鏀懼純鎵ц錛岄櫎闈?a)"閱掓潵"鐨勭嚎紼嬪叿鏈夋洿楂樼殑浼樺厛綰с?br />
銆銆(b)姝e湪榪愯鐨勭嚎紼嬪洜涓哄叾瀹冨師鍥犺岄樆濉炪?
銆銆wait()鏄嚎紼嬩氦浜掓椂錛屽鏋滅嚎紼嬪涓涓悓姝ュ璞 鍙戝嚭涓涓獁ait()璋冪敤錛岃綰跨▼浼氭殏鍋滄墽琛岋紝琚皟瀵硅薄榪涘叆絳夊緟鐘舵侊紝鐩村埌琚敜閱掓垨絳夊緟鏃墮棿鍒般?

銆銆絎崄涓夛紝Java鏈夋病鏈塯oto?

銆銆Goto鈥攋ava涓殑淇濈暀瀛楋紝鐜板湪娌℃湁鍦╦ava涓嬌鐢ㄣ?

銆銆絎崄鍥涳紝鏁扮粍鏈夋病鏈塴ength()榪欎釜鏂規硶? String鏈夋病鏈塴ength()榪欎釜鏂規硶錛?/strong>

銆銆鏁扮粍娌℃湁length()榪欎釜鏂規硶錛屾湁length鐨勫睘鎬с?
銆銆String鏈夋湁length()榪欎釜鏂規硶銆?

銆銆絎崄浜旓紝Overload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綾誨瀷?

銆銆鏂規硶鐨勯噸鍐橭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埗綾諱笌瀛愮被涔嬮棿澶氭佹х殑涓縐嶈〃鐜幫紝閲嶈澆Overloading鏄竴涓被涓鎬佹х殑涓縐嶈〃鐜般傚鏋滃湪瀛愮被涓畾涔夋煇鏂規硶涓庡叾鐖剁被鏈夌浉鍚岀殑鍚嶇О鍜屽弬鏁幫紝鎴戜滑璇磋鏂規硶琚噸鍐?(Overriding)銆傚瓙綾葷殑瀵硅薄浣跨敤榪欎釜鏂規硶鏃訛紝灝嗚皟鐢ㄥ瓙綾諱腑鐨勫畾涔夛紝瀵瑰畠鑰岃█錛岀埗綾諱腑鐨勫畾涔夊鍚岃"灞忚斀"浜嗐傚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頒釜鏁版垨鏈変笉鍚岀殑鍙傛暟綾誨瀷錛屽垯縐頒負鏂規硶鐨勯噸杞?Overloading)銆侽verloaded鐨勬柟娉曟槸鍙互鏀瑰彉榪斿洖鍊肩殑綾誨瀷銆?

銆銆絎崄鍏紝Set閲岀殑鍏冪礌鏄笉鑳介噸澶嶇殑錛岄偅涔堢敤浠涔堟柟娉曟潵鍖哄垎閲嶅涓庡惁鍛? 鏄敤==榪樻槸equals()? 瀹冧滑鏈変綍鍖哄埆?

銆銆Set閲岀殑鍏冪礌鏄笉鑳介噸澶嶇殑錛岄偅涔堢敤iterator()鏂規硶鏉ュ尯鍒嗛噸澶嶄笌鍚︺俥quals()鏄垽璇諱袱涓猄et鏄惁鐩哥瓑銆?
銆銆equals()鍜?=鏂規硶鍐沖畾寮曠敤鍊兼槸鍚︽寚鍚戝悓涓瀵硅薄equals()鍦ㄧ被涓瑕嗙洊錛屼負鐨勬槸褰撲袱涓垎紱葷殑瀵硅薄鐨勫唴瀹瑰拰綾誨瀷鐩擱厤鐨勮瘽錛岃繑鍥炵湡鍊箋?

銆銆絎崄涓冿紝緇欐垜涓涓綘鏈甯歌鍒扮殑runtime exception銆?/strong>

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

銆銆絎崄鍏紝error鍜宔xception鏈変粈涔堝尯鍒?

銆銆error 琛ㄧず鎭㈠涓嶆槸涓嶅彲鑳戒絾寰堝洶闅劇殑鎯呭喌涓嬬殑涓縐嶄弗閲嶉棶棰樸傛瘮濡傝鍐呭瓨婧㈠嚭銆備笉鍙兘鎸囨湜紼嬪簭鑳藉鐞嗚繖鏍風殑鎯呭喌銆?
銆銆exception 琛ㄧず涓縐嶈璁℃垨瀹炵幇闂銆備篃灝辨槸璇達紝瀹冭〃紺哄鏋滅▼搴忚繍琛屾甯革紝浠庝笉浼氬彂鐢熺殑鎯呭喌銆?

銆銆絎崄涔濓紝List, Set, Map鏄惁緇ф壙鑷狢ollection鎺ュ彛?

銆銆List錛孲et鏄?

銆銆Map涓嶆槸

銆絎簩鍗侊紝abstract class鍜宨nterface鏈変粈涔堝尯鍒?

銆銆澹版槑鏂規硶鐨勫瓨鍦ㄨ屼笉鍘誨疄鐜板畠鐨勭被琚彨鍋氭娊璞$被錛坅bstract class錛夛紝瀹冪敤浜庤鍒涘緩涓涓綋鐜版煇浜涘熀鏈涓虹殑綾伙紝騫朵負璇ョ被澹版槑鏂規硶錛屼絾涓嶈兘鍦ㄨ綾諱腑瀹炵幇璇ョ被鐨勬儏鍐點備笉鑳藉垱寤篴bstract 綾葷殑瀹炰緥銆傜劧鑰屽彲浠ュ垱寤轟竴涓彉閲忥紝鍏剁被鍨嬫槸涓涓娊璞$被錛屽茍璁╁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 綾葷殑瀛愮被涓哄畠浠埗綾諱腑鐨勬墍鏈夋娊璞℃柟娉曟彁渚涘疄鐜幫紝鍚﹀垯瀹冧滑涔熸槸鎶借薄綾諱負銆傚彇鑰屼唬涔嬶紝鍦ㄥ瓙綾諱腑瀹炵幇璇ユ柟娉曘傜煡閬撳叾琛屼負鐨勫叾瀹冪被鍙互鍦ㄧ被涓疄鐜拌繖浜涙柟娉曘?

銆銆鎺ュ彛錛坕nterface錛夋槸鎶借薄綾葷殑鍙樹綋銆傚湪鎺ュ彛涓紝鎵鏈夋柟娉曢兘鏄娊璞$殑銆傚緇ф壙鎬у彲閫氳繃瀹炵幇榪欐牱鐨勬帴鍙h岃幏寰椼傛帴鍙d腑鐨勬墍鏈夋柟娉曢兘鏄娊璞$殑錛屾病鏈変竴涓湁紼嬪簭浣撱傛帴鍙e彧鍙互瀹氫箟static final鎴愬憳鍙橀噺銆傛帴鍙g殑瀹炵幇涓庡瓙綾葷浉浼鹼紝闄や簡璇ュ疄鐜扮被涓嶈兘浠庢帴鍙e畾涔変腑緇ф壙琛屼負銆傚綋綾誨疄鐜扮壒孌婃帴鍙f椂錛屽畠瀹氫箟錛堝嵆灝嗙▼搴忎綋緇欎簣錛夋墍鏈夎繖縐嶆帴鍙g殑鏂規硶銆傜劧鍚庯紝瀹冨彲浠ュ湪瀹炵幇浜嗚鎺ュ彛鐨勭被鐨勪換浣曞璞′笂璋冪敤鎺ュ彛鐨勬柟娉曘傜敱浜庢湁鎶借薄綾伙紝瀹冨厑璁鎬嬌鐢ㄦ帴鍙e悕浣滀負寮曠敤鍙橀噺鐨勭被鍨嬨傞氬父鐨勫姩鎬佽仈緙栧皢鐢熸晥銆傚紩鐢ㄥ彲浠ヨ漿鎹㈠埌鎺ュ彛綾誨瀷鎴栦粠鎺ュ彛綾誨瀷杞崲錛宨nstanceof 榪愮畻絎﹀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?

銆銆絎簩鍗佷竴錛宎bstract鐨刴ethod鏄惁鍙悓鏃舵槸static,鏄惁鍙悓鏃舵槸native錛屾槸鍚﹀彲鍚屾椂鏄痵ynchronized?

銆銆閮戒笉鑳?

銆銆絎簩鍗佷簩錛屾帴鍙f槸鍚﹀彲緇ф壙鎺ュ彛? 鎶借薄綾繪槸鍚﹀彲瀹炵幇(implements)鎺ュ彛? 鎶借薄綾繪槸鍚﹀彲緇ф壙瀹炰綋綾?concrete class)?

銆銆鎺ュ彛鍙互緇ф壙鎺ュ彛銆傛娊璞$被鍙互瀹炵幇(implements)鎺ュ彛錛屾娊璞$被鏄惁鍙戶鎵垮疄浣撶被錛屼絾鍓嶆彁鏄疄浣撶被蹇呴』鏈夋槑紜殑鏋勯犲嚱鏁般?

銆銆絎簩鍗佷笁錛屽惎鍔ㄤ竴涓嚎紼嬫槸鐢╮un()榪樻槸start()?

銆銆鍚姩涓涓嚎紼嬫槸璋冪敤start()鏂規硶錛屼嬌綰跨▼鎵浠h〃鐨勮櫄鎷熷鐞嗘満澶勪簬鍙繍琛岀姸鎬侊紝榪欐剰鍛崇潃瀹冨彲浠ョ敱JVM璋冨害騫舵墽琛屻傝繖騫朵笉鎰忓懗鐫綰跨▼灝變細绔嬪嵆榪愯銆俽un()鏂規硶鍙互浜х敓蹇呴』閫鍑虹殑鏍囧織鏉ュ仠姝竴涓嚎紼嬨?

銆銆絎簩鍗佸洓錛屾瀯閫犲櫒Constructor鏄惁鍙override?

銆銆鏋勯犲櫒Constructor涓嶈兘琚戶鎵匡紝鍥犳涓嶈兘閲嶅啓Overriding錛屼絾鍙互琚噸杞絆verloading銆?

銆銆絎簩鍗佷簲錛屾槸鍚﹀彲浠ョ戶鎵縎tring綾?

銆銆String綾繪槸final綾繪晠涓嶅彲浠ョ戶鎵褲?

銆銆絎簩鍗佸叚錛屽綋涓涓嚎紼嬭繘鍏ヤ竴涓璞$殑涓涓猻ynchronized鏂規硶鍚庯紝鍏跺畠綰跨▼鏄惁鍙繘鍏ユ瀵硅薄鐨勫叾瀹冩柟娉?

銆銆涓嶈兘錛屼竴涓璞$殑涓涓猻ynchronized鏂規硶鍙兘鐢變竴涓嚎紼嬭闂?

銆銆絎簩鍗佷竷錛宼ry {}閲屾湁涓涓猺eturn璇彞錛岄偅涔堢揣璺熷湪榪欎釜try鍚庣殑finally {}閲岀殑code浼氫笉浼氳鎵ц錛屼粈涔堟椂鍊欒鎵ц錛屽湪return鍓嶈繕鏄悗?

銆銆浼氭墽琛岋紝鍦╮eturn鍓嶆墽琛屻?

銆銆絎簩鍗佸叓錛岀紪紼嬮: 鐢ㄦ渶鏈夋晥鐜囩殑鏂規硶綆楀嚭2涔樹互8絳夋柤鍑?

銆銆鏈塁鑳屾櫙鐨勭▼搴忓憳鐗瑰埆鍠滄闂繖縐嶉棶棰樸?

銆銆絎簩鍗佷節錛屼袱涓璞″肩浉鍚?x.equals(y) == true)錛屼絾鍗村彲鏈変笉鍚岀殑hash code錛岃繖鍙ヨ瘽瀵逛笉瀵?

銆銆涓嶅錛屾湁鐩稿悓鐨刪ash code銆?

銆銆絎笁鍗侊紝褰撲竴涓璞¤褰撲綔鍙傛暟浼犻掑埌涓涓柟娉曞悗錛屾鏂規硶鍙敼鍙樿繖涓璞$殑灞炴э紝騫跺彲榪斿洖鍙樺寲鍚庣殑緇撴灉錛岄偅涔堣繖閲屽埌搴曟槸鍊間紶閫掕繕鏄紩鐢ㄤ紶閫?

銆銆鏄間紶閫掋侸ava 緙栫▼璇█鍙敱鍊間紶閫掑弬鏁般傚綋涓涓璞″疄渚嬩綔涓轟竴涓弬鏁拌浼犻掑埌鏂規硶涓椂錛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錛屼絾瀵硅薄鐨勫紩鐢ㄦ槸姘歌繙涓嶄細鏀瑰彉鐨勩?

銆銆絎笁鍗佷竴錛宻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?

銆銆switch錛坋xpr1錛変腑錛宔xpr1鏄竴涓暣鏁拌〃杈懼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?

銆銆絎笁鍗佷簩錛岀紪紼嬮: 鍐欎竴涓猄ingleton鍑烘潵銆?/strong>

銆銆Singleton妯″紡涓昏浣滅敤鏄繚璇佸湪Java搴旂敤紼嬪簭涓紝涓涓被Class鍙湁涓涓疄渚嬪瓨鍦ㄣ?

銆銆涓鑸琒ingleton妯″紡閫氬父鏈夊嚑縐嶇褰㈠紡:

銆銆絎竴縐嶅艦寮? 瀹氫箟涓涓被錛屽畠鐨勬瀯閫犲嚱鏁頒負private鐨勶紝瀹冩湁涓涓猻tatic鐨刾rivate鐨勮綾誨彉閲忥紝鍦ㄧ被鍒濆鍖栨椂瀹炰緥璇濓紝閫氳繃涓涓猵ublic鐨刧etInstance鏂規硶鑾峰彇瀵瑰畠鐨勫紩鐢?緇ц岃皟鐢ㄥ叾涓殑鏂規硶銆?


銆銆public class Singleton {
銆銆private Singleton(){}
銆銆//鍦ㄨ嚜宸卞唴閮ㄥ畾涔夎嚜宸變竴涓疄渚嬶紝鏄笉鏄緢濂囨紵
銆銆//娉ㄦ剰榪欐槸private 鍙緵鍐呴儴璋冪敤
銆銆private static Singleton instance = new Singleton();
銆銆//榪欓噷鎻愪緵浜嗕竴涓緵澶栭儴璁塊棶鏈琧lass鐨勯潤鎬佹柟娉曪紝鍙互鐩存帴璁塊棶銆銆
銆銆public static Singleton getInstance() {
銆銆return instance; 銆銆
銆銆}
銆銆}

銆銆絎簩縐嶅艦寮?


銆銆public class Singleton {
銆銆private static Singleton instance = null;
銆銆public static synchronized Singleton getInstance() {
銆銆//榪欎釜鏂規硶姣斾笂闈㈡湁鎵鏀硅繘錛屼笉鐢ㄦ瘡嬈¢兘榪涜鐢熸垚瀵硅薄錛屽彧鏄涓嬈°銆銆 銆
銆銆//浣跨敤鏃剁敓鎴愬疄渚嬶紝鎻愰珮浜嗘晥鐜囷紒
銆銆if (instance==null)
銆銆instance錛漬ew Singleton();
銆銆return instance; 銆銆}
銆銆}

銆銆鍏朵粬褰㈠紡:

銆銆瀹氫箟涓涓被錛屽畠鐨勬瀯閫犲嚱鏁頒負private鐨勶紝鎵鏈夋柟娉曚負static鐨勩?
銆銆涓鑸涓虹涓縐嶅艦寮忚鏇村姞瀹夊叏浜?

銆銆Hashtable鍜孒ashMap
銆銆Hashtable緇ф壙鑷狣ictionary綾伙紝鑰孒ashMap鏄疛ava1.2寮曡繘鐨凪ap interface鐨勪竴涓疄鐜?

銆銆HashMap鍏佽灝唍ull浣滀負涓涓猠ntry鐨刱ey鎴栬卾alue錛岃孒ashtable涓嶅厑璁?

銆銆榪樻湁灝辨槸錛孒ashMap鎶奌ashtable鐨刢ontains鏂規硶鍘繪帀浜嗭紝鏀規垚containsvalue鍜宑ontainsKey銆傚洜涓篶ontains鏂規硶瀹規槗璁╀漢寮曡搗璇В銆?

銆銆鏈澶х殑涓嶅悓鏄紝Hashtable鐨勬柟娉曟槸Synchronize鐨勶紝鑰孒ashMap涓嶆槸錛屽湪
銆銆澶氫釜綰跨▼璁塊棶Hashtable鏃訛紝涓嶉渶瑕佽嚜宸變負瀹冪殑鏂規硶瀹炵幇鍚屾錛岃孒ashMap
銆銆灝卞繀欏諱負涔嬫彁渚涘鍚屾銆?

銆銆Hashtable鍜孒ashMap閲囩敤鐨刪ash/rehash綆楁硶閮藉ぇ姒備竴鏍鳳紝鎵浠ユц兘涓嶄細鏈夊緢澶х殑宸紓銆?br />


inclear 浜?3 : 51 鍙戣〃

pts 2005-02-04 05:51 鍙戣〃璇勮
]]>
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