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<script type="text/javascript" src="http://wujunlove.googlepages.com/bigstaticeyes.js"></script>zh-cnWed, 28 Feb 2007 20:29:47 GMTWed, 28 Feb 2007 20:29:47 GMT60- JAVA紼嬪簭鍛橀潰璇?2闂?杞琭rom Java涓枃绔? http://www.tkk7.com/ltc603/archive/2006/01/18/28499.html闃挎垚闃挎垚Wed, 18 Jan 2006 07:36:00 GMThttp://www.tkk7.com/ltc603/archive/2006/01/18/28499.htmlhttp://www.tkk7.com/ltc603/comments/28499.htmlhttp://www.tkk7.com/ltc603/archive/2006/01/18/28499.html#Feedback0http://www.tkk7.com/ltc603/comments/commentRss/28499.htmlhttp://www.tkk7.com/ltc603/services/trackbacks/28499.html
聽聽聽聽絎簩錛孉nonymous聽Inner聽Class聽錛堝尶鍚嶅唴閮ㄧ被錛壜犳槸鍚﹀彲浠xtends錛堢戶鎵匡級鍏跺畠綾伙紝鏄惁鍙互implements錛堝疄鐜幫級interface錛堟帴鍙o級錛?
聽聽聽聽絎笁錛孲tatic聽Nested聽Class聽鍜屄營nner聽Class鐨勪笉鍚岋紝璇村緱瓚婂瓚婂ソ錛堥潰璇曢鏈夌殑寰堢緇燂級銆?
聽聽聽聽絎洓錛?amp;鍜?amp;&鐨勫尯鍒?
聽聽聽聽絎簲錛孒ashMap鍜孒ashtable鐨勫尯鍒?
聽聽聽聽絎叚錛孋ollection聽鍜屄燙ollections鐨勫尯鍒?
聽聽聽聽絎竷錛屼粈涔堟椂鍊欑敤assert.
聽聽聽聽絎叓錛孏C鏄粈涔堬紵聽涓轟粈涔堣鏈塆C錛?
聽聽聽聽絎節錛孲tring聽s聽=聽new聽String錛?xyz"錛夛紱鍒涘緩浜嗗嚑涓猄tring聽Object錛?
聽聽聽聽絎崄錛孧ath.round錛?1.5錛夌瓑鏂煎灝戯紵聽Math.round錛?11.5錛夌瓑鏂煎灝戯紵
聽聽聽聽絎崄涓錛宻hort聽s1聽=聽1錛浡爏1聽=聽s1聽+聽1錛涙湁浠涔堥敊錛熉爏hort聽s1聽=聽1錛浡爏1聽+=聽1錛涙湁浠涔堥敊錛?
聽聽聽聽絎崄浜岋紝sleep錛堬級聽鍜屄爓ait錛堬級聽鏈変粈涔堝尯鍒紵
聽聽聽聽絎崄涓夛紝Java鏈夋病鏈塯oto錛?
聽聽聽聽絎崄鍥涳紝鏁扮粍鏈夋病鏈塴ength錛堬級榪欎釜鏂規硶錛熉燬tring鏈夋病鏈塴ength錛堬級榪欎釜鏂規硶錛?
聽聽聽聽絎崄浜旓紝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錛?
聽聽聽聽絎崄鍏紝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紵聽鏄敤==榪樻槸equals錛堬級錛熉犲畠浠湁浣曞尯鍒紵
聽聽聽聽絎崄涓冿紝緇欐垜涓涓綘鏈甯歌鍒扮殑runtime聽exception.
聽聽聽聽絎崄鍏紝error鍜宔xception鏈変粈涔堝尯鍒紵
聽聽聽聽絎崄涔濓紝List錛屄燬et錛屄燤ap鏄惁緇ф壙鑷狢ollection鎺ュ彛錛?
聽聽聽聽絎簩鍗侊紝abstract聽class鍜宨nterface鏈変粈涔堝尯鍒紵
聽聽聽聽絎簩鍗佷竴錛宎bstract鐨刴ethod鏄惁鍙悓鏃舵槸static錛屾槸鍚﹀彲鍚屾椂鏄痭ative錛屾槸鍚﹀彲鍚屾椂鏄痵ynchronized錛?
聽聽聽聽絎簩鍗佷簩錛屾帴鍙f槸鍚﹀彲緇ф壙鎺ュ彛錛熉犳娊璞$被鏄惁鍙疄鐜幫紙implements錛夋帴鍙o紵聽鎶借薄綾繪槸鍚﹀彲緇ф壙瀹炰綋綾伙紙concrete聽class錛夛紵
聽聽聽聽絎簩鍗佷笁錛屽惎鍔ㄤ竴涓嚎紼嬫槸鐢╮un錛堬級榪樻槸start錛堬級錛?
聽聽聽聽絎簩鍗佸洓錛屾瀯閫犲櫒Constructor鏄惁鍙override錛?
聽聽聽聽絎簩鍗佷簲錛屾槸鍚﹀彲浠ョ戶鎵縎tring綾伙紵
聽聽聽聽絎簩鍗佸叚錛屽綋涓涓嚎紼嬭繘鍏ヤ竴涓璞$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曪紵
聽聽聽聽絎簩鍗佷竷錛宼ry聽{}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聽{}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鍓嶈繕鏄悗錛?
聽聽聽聽絎簩鍗佸叓錛岀紪紼嬮錛毬犵敤鏈鏈夋晥鐜囩殑鏂規硶綆楀嚭2涔樹互8絳夋柤鍑狅紵
聽聽聽聽絎簩鍗佷節錛屼袱涓璞″肩浉鍚岋紙x.equals錛坹錛壜?=聽true錛夛紝浣嗗嵈鍙湁涓嶅悓鐨刪ash聽code錛岃繖鍙ヨ瘽瀵逛笉瀵癸紵
聽聽聽聽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$殑灞炴э紝騫跺彲榪斿洖鍙樺寲鍚庣殑緇撴灉錛岄偅涔堣繖閲屽埌搴曟槸鍊間紶閫掕繕鏄紩鐢ㄤ紶閫掞紵
聽聽聽聽絎笁鍗佷竴錛宻wtich鏄惁鑳戒綔鐢ㄥ湪byte涓婏紝鏄惁鑳戒綔鐢ㄥ湪long涓婏紝鏄惁鑳戒綔鐢ㄥ湪String涓婏紵
聽聽聽聽絎笁鍗佷簩錛岀紪紼嬮錛毬犲啓涓涓猄ingleton鍑烘潵銆?
浠ヤ笅鏄瓟妗?
聽聽聽聽絎竴錛岃皥璋坒inal錛屄爁inally錛屄爁inalize鐨勫尯鍒?
聽聽聽聽final錛熶慨楗扮錛堝叧閿瓧錛夊鏋滀竴涓被琚0鏄庝負final錛屾剰鍛崇潃瀹冧笉鑳藉啀媧劇敓鍑烘柊鐨勫瓙綾伙紝涓嶈兘浣滀負鐖剁被琚戶鎵褲傚洜姝や竴涓被涓嶈兘鏃㈣澹版槑涓郝燼bstract鐨勶紝鍙堣澹版槑涓篺inal鐨勩傚皢鍙橀噺鎴栨柟娉曞0鏄庝負final錛屽彲浠ヤ繚璇佸畠浠湪浣跨敤涓笉琚敼鍙樸傝澹版槑涓篺inal鐨勫彉閲忓繀欏誨湪澹版槑鏃剁粰瀹氬垵鍊鹼紝鑰屽湪浠ュ悗鐨勫紩鐢ㄤ腑鍙兘璇誨彇錛屼笉鍙慨鏀廣傝澹版槑涓篺inal鐨勬柟娉曚篃鍚屾牱鍙兘浣跨敤錛屼笉鑳介噸杞絝inally錛熷啀寮傚父澶勭悊鏃舵彁渚浡爁inally聽鍧楁潵鎵ц浠諱綍娓呴櫎鎿嶄綔銆傚鏋滄姏鍑轟竴涓紓甯革紝閭d箞鐩稿尮閰嶇殑聽catch聽瀛愬彞灝變細鎵ц錛岀劧鍚庢帶鍒跺氨浼氳繘鍏ヂ爁inally聽鍧楋紙濡傛灉鏈夌殑璇濓級銆?
聽聽聽聽finalize錛熸柟娉曞悕銆侸ava聽鎶鏈厑璁鎬嬌鐢爁inalize錛堬級聽鏂規硶鍦ㄥ瀮鍦炬敹闆嗗櫒灝嗗璞′粠鍐呭瓨涓竻闄ゅ嚭鍘諱箣鍓嶅仛蹇呰鐨勬竻鐞嗗伐浣溿傝繖涓柟娉曟槸鐢卞瀮鍦炬敹闆嗗櫒鍦ㄧ‘瀹氳繖涓璞℃病鏈夎寮曠敤鏃跺榪欎釜瀵硅薄璋冪敤鐨勩傚畠鏄湪聽Object聽綾諱腑瀹氫箟鐨勶紝鍥犳鎵鏈夌殑綾婚兘緇ф壙浜嗗畠銆傚瓙綾昏鐩柭爁inalize錛堬級聽鏂規硶浠ユ暣鐞嗙郴緇熻祫婧愭垨鑰呮墽琛屽叾浠栨竻鐞嗗伐浣溿俧inalize錛堬級聽鏂規硶鏄湪鍨冨溇鏀墮泦鍣ㄥ垹闄ゅ璞′箣鍓嶅榪欎釜瀵硅薄璋冪敤鐨勩?
聽聽聽聽絎簩錛孉nonymous聽Inner聽Class聽錛堝尶鍚嶅唴閮ㄧ被錛壜犳槸鍚﹀彲浠xtends錛堢戶鎵匡級鍏跺畠綾伙紝鏄惁鍙互implements錛堝疄鐜幫級interface錛堟帴鍙o級錛?
聽聽聽聽鍖垮悕鐨勫唴閮ㄧ被鏄病鏈夊悕瀛楃殑鍐呴儴綾匯備笉鑳絜xtends錛堢戶鎵匡級聽鍏跺畠綾伙紝浣嗕竴涓唴閮ㄧ被鍙互浣滀負涓涓帴鍙o紝鐢卞彟涓涓唴閮ㄧ被瀹炵幇銆?
聽聽聽聽絎笁錛孲tatic聽Nested聽Class聽鍜屄營nner聽Class鐨勪笉鍚岋紝璇村緱瓚婂瓚婂ソ錛堥潰璇曢鏈夌殑寰堢緇燂級銆?
聽聽聽聽Nested聽Class聽錛堜竴鑸槸C++鐨勮娉曪級錛孖nner聽Class聽錛堜竴鑸槸JAVA鐨勮娉曪級銆侸ava鍐呴儴綾諱笌C++宓屽綾繪渶澶х殑涓嶅悓灝卞湪浜庢槸鍚︽湁鎸囧悜澶栭儴鐨勫紩鐢ㄤ笂銆傚叿浣撳彲瑙乭ttp錛毬?/www.frontfree.net/articles/services/view.asp錛焛d=704&page=1
聽聽聽聽娉細聽闈欐佸唴閮ㄧ被錛圛nner聽Class錛夋剰鍛崇潃1鍒涘緩涓涓猻tatic鍐呴儴綾葷殑瀵硅薄錛屼笉闇瑕佷竴涓閮ㄧ被瀵硅薄錛?涓嶈兘浠庝竴涓猻tatic鍐呴儴綾葷殑涓涓璞¤闂竴涓閮ㄧ被瀵硅薄
聽聽聽聽絎洓錛?amp;鍜?amp;&鐨勫尯鍒?
聽聽聽聽&鏄綅榪愮畻絎︺?amp;&鏄竷灝旈昏緫榪愮畻絎︺?
聽聽聽聽絎簲錛孒ashMap鍜孒ashtable鐨勫尯鍒?
聽聽聽聽閮藉睘浜嶮ap鎺ュ彛鐨勭被錛屽疄鐜頒簡灝嗘儫涓閿槧灝勫埌鐗瑰畾鐨勫間笂銆?
聽聽聽聽HashMap聽綾繪病鏈夊垎綾繪垨鑰呮帓搴忋傚畠鍏佽涓涓爊ull聽閿拰澶氫釜聽null聽鍊箋?
聽聽聽聽Hashtable聽綾諱技浜幝燞ashMap錛屼絾鏄笉鍏佽聽null聽閿拰聽null聽鍊箋傚畠涔熸瘮聽HashMap聽鎱紝鍥犱負瀹冩槸鍚屾鐨勩?
聽聽聽聽絎叚錛孋ollection聽鍜屄燙ollections鐨勫尯鍒?
聽聽聽聽Collections鏄釜java.util涓嬬殑綾伙紝瀹冨寘鍚湁鍚勭鏈夊叧闆嗗悎鎿嶄綔鐨勯潤鎬佹柟娉曘?
聽聽聽聽Collection鏄釜java.util涓嬬殑鎺ュ彛錛屽畠鏄悇縐嶉泦鍚堢粨鏋勭殑鐖舵帴鍙c?
絎竷錛屼粈涔堟椂鍊欑敤assert銆偮?
銆銆鏂█鏄竴涓寘鍚竷灝旇〃杈懼紡鐨勮鍙ワ紝鍦ㄦ墽琛岃繖涓鍙ユ椂鍋囧畾璇ヨ〃杈懼紡涓郝爐rue銆傚鏋滆〃杈懼紡璁$畻涓郝爁alse錛岄偅涔堢郴緇熶細鎶ュ憡涓涓燗ssertionError銆傚畠鐢ㄤ簬璋冭瘯鐩殑錛毬?
assert(a聽>聽0);聽//聽throws聽an聽AssertionError聽if聽a聽<=聽0聽
銆銆鏂█鍙互鏈変袱縐嶅艦寮忥細聽
銆銆assert聽Expression1聽;聽
銆銆assert聽Expression1聽:聽Expression2聽;聽
銆銆Expression1聽搴旇鎬繪槸浜х敓涓涓竷灝斿箋偮?
銆銆Expression2聽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聽String聽娑堟伅銆偮?
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█錛岄渶瑕佷嬌鐢爏ource聽1.4聽鏍囪錛毬?
銆銆javac聽-source聽1.4聽Test.java聽
銆銆瑕佸湪榪愯鏃跺惎鐢ㄦ柇璦錛屽彲浣跨敤聽-enableassertions聽鎴栬吢?ea聽鏍囪銆偮?
銆銆瑕佸湪榪愯鏃墮夋嫨紱佺敤鏂█錛屽彲浣跨敤聽-da聽鎴栬吢?disableassertions聽鏍囪銆偮?
銆銆瑕佺郴緇熺被涓惎鐢ㄦ柇璦錛屽彲浣跨敤聽-esa聽鎴栬吢?dsa聽鏍囪銆傝繕鍙互鍦ㄥ寘鐨勫熀紜涓婂惎鐢ㄦ垨鑰呯鐢ㄦ柇璦銆偮?
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偮?
銆銆絎叓錛孏C鏄粈涔?聽涓轟粈涔堣鏈塆C?聽(鍩虹)銆偮?
銆銆GC鏄瀮鍦炬敹闆嗗櫒銆侸ava聽紼嬪簭鍛樹笉鐢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殑鏂規硶涔嬩竴錛毬?
銆銆System.gc()聽
銆銆Runtime.getRuntime().gc()聽
銆銆絎節錛孲tring聽s聽=聽new聽String("xyz");鍒涘緩浜嗗嚑涓猄tring聽Object?聽
銆銆涓や釜瀵硅薄錛屼竴涓槸鈥渪yx鈥?涓涓槸鎸囧悜鈥渪yx鈥濈殑寮曠敤瀵硅薄s銆偮?
銆銆絎崄錛孧ath.round(11.5)絳夋柤澶氬皯?聽Math.round(-11.5)絳夋柤澶氬皯?聽
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;聽
銆銆絎崄涓錛宻hort聽s1聽=聽1;聽s1聽=聽s1聽+聽1;鏈変粈涔堥敊?聽short聽s1聽=聽1;聽s1聽+=聽1;鏈変粈涔堥敊?聽
銆銆short聽s1聽=聽1;聽s1聽=聽s1聽+聽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聽=(short)(s1聽+聽1)聽銆俿hort聽s1聽=聽1;聽s1聽+=聽1姝g‘銆偮?
銆銆絎崄浜岋紝sleep()聽鍜屄爓ait()聽鏈変粈涔堝尯鍒?聽鎼炵嚎紼嬬殑鏈鐖甭?
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聽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)鈥滈啋鏉モ濈殑綰跨▼鍏鋒湁鏇撮珮鐨勪紭鍏堢駭錛?b)姝e湪榪愯鐨勭嚎紼嬪洜涓哄叾瀹冨師鍥犺岄樆濉炪偮?
銆銆wait()鏄嚎紼嬩氦浜掓椂錛屽鏋滅嚎紼嬪涓涓悓姝ュ璞聽鍙戝嚭涓涓獁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偮?
銆銆絎崄涓夛紝Java鏈夋病鏈塯oto?聽
銆銆Goto?java涓殑淇濈暀瀛楋紝鐜板湪娌℃湁鍦╦ava涓嬌鐢ㄣ偮?
銆銆絎崄鍥涳紝鏁扮粍鏈夋病鏈塴ength()榪欎釜鏂規硶?聽String鏈夋病鏈塴ength()榪欎釜鏂規硶錛熉?
銆銆鏁扮粍娌℃湁length()榪欎釜鏂規硶錛屾湁length鐨勫睘鎬с偮?
銆銆String鏈夋湁length()榪欎釜鏂規硶銆偮?
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?聽
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櫬?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偮?
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?聽鏄敤==榪樻槸equals()?聽瀹冧滑鏈変綍鍖哄埆?聽
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鏄惁鐩哥瓑銆偮?
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偮?
銆銆絎崄涓冿紝緇欐垜涓涓綘鏈甯歌鍒扮殑runtime聽exception銆偮?
銆銆ArithmeticException,聽ArrayStoreException,聽BufferOverflowException,聽BufferUnderflowException,聽聽CannotRedoException,聽聽聽
CannotUndoException,聽聽ClassCastException,聽CMMException,聽聽聽ConcurrentModificationException,聽聽
DOMException,聽EmptyStackException,聽IllegalArgumentException,聽聽IllegalMonitorStateException,聽聽
IllegalPathStateException,聽聽IllegalStateException,聽聽
ImagingOpException,聽聽
IndexOutOfBoundsException,聽聽MissingResourceException,聽聽NegativeArraySizeException,聽聽NoSuchElementException,聽聽
NullPointerException,聽聽ProfileDataException,聽ProviderException,聽
聽RasterFormatException,聽聽SecurityException,聽SystemException,
聽UndeclaredThrowableException,聽聽
UnmodifiableSetException,聽聽UnsupportedOperationException聽聽
銆銆絎崄鍏紝error鍜宔xception鏈変粈涔堝尯鍒?聽
銆銆error聽琛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聽琛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偮?
銆銆絎崄涔濓紝List,聽Set,聽Map鏄惁緇ф壙鑷狢ollection鎺ュ彛?聽
銆銆List錛孲et鏄?
銆銆Map涓嶆槸聽
銆銆絎簩鍗侊紝abstract聽class鍜宨nterface鏈変粈涔堝尯鍒?聽
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聽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聽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$被錛屽茍璁╁畠鎸囧悜鍏蜂綋瀛愮被鐨勪竴涓疄渚嬨備笉鑳芥湁鎶借薄鏋勯犲嚱鏁版垨鎶借薄闈欐佹柟娉曘侫bstract聽綾葷殑瀛愮被涓哄畠浠埗綾諱腑鐨勬墍鏈夋娊璞℃柟娉曟彁渚涘疄鐜幫紝鍚﹀垯瀹冧滑涔熸槸鎶借薄綾諱負銆傚彇鑰屼唬涔嬶紝鍦ㄥ瓙綾諱腑瀹炵幇璇ユ柟娉曘傜煡閬撳叾琛屼負鐨勫叾瀹冪被鍙互鍦ㄧ被涓疄鐜拌繖浜涙柟娉曘偮?
銆銆鎺ュ彛錛坕nterface錛夋槸鎶借薄綾葷殑鍙樹綋銆傚湪鎺ュ彛涓紝鎵鏈夋柟娉曢兘鏄娊璞$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$殑錛屾病鏈変竴涓湁紼嬪簭浣撱傛帴鍙e彧鍙互瀹氫箟static聽final鎴愬憳鍙橀噺銆傛帴鍙g殑瀹炵幇涓庡瓙綾葷浉浼鹼紝闄や簡璇ュ疄鐜扮被涓嶈兘浠庢帴鍙e畾涔変腑緇ф壙琛屼負銆傚綋綾誨疄鐜扮壒孌婃帴鍙f椂錛屽畠瀹氫箟錛堝嵆灝嗙▼搴忎綋緇欎簣錛夋墍鏈夎繖縐嶆帴鍙g殑鏂規硶銆傜劧鍚庯紝瀹冨彲浠ュ湪瀹炵幇浜嗚鎺ュ彛鐨勭被鐨勪換浣曞璞′笂璋冪敤鎺ュ彛鐨勬柟娉曘傜敱浜庢湁鎶借薄綾伙紝瀹冨厑璁鎬嬌鐢ㄦ帴鍙e悕浣滀負寮曠敤鍙橀噺鐨勭被鍨嬨傞氬父鐨勫姩鎬佽仈緙栧皢鐢熸晥銆傚紩鐢ㄥ彲浠ヨ漿鎹㈠埌鎺ュ彛綾誨瀷鎴栦粠鎺ュ彛綾誨瀷杞崲錛宨nstanceof聽榪愮畻絎﹀彲浠ョ敤鏉ュ喅瀹氭煇瀵硅薄鐨勭被鏄惁瀹炵幇浜嗘帴鍙c偮?
銆銆絎簩鍗佷竴錛宎bstract鐨刴ethod鏄惁鍙悓鏃舵槸static,鏄惁鍙悓鏃舵槸native錛屾槸鍚﹀彲鍚屾椂鏄痵ynchronized?聽
銆銆閮戒笉鑳鉸?
銆銆絎簩鍗佷簩錛屾帴鍙f槸鍚﹀彲緇ф壙鎺ュ彛?聽鎶借薄綾繪槸鍚﹀彲瀹炵幇(implements)鎺ュ彛?聽鎶借薄綾繪槸鍚﹀彲緇ф壙瀹炰綋綾?concrete聽class)?聽
銆銆鎺ュ彛鍙互緇ф壙鎺ュ彛銆傛娊璞$被鍙互瀹炵幇(implements)鎺ュ彛錛屾娊璞$被鏄惁鍙戶鎵垮疄浣撶被錛屼絾鍓嶆彁鏄疄浣撶被蹇呴』鏈夋槑紜殑鏋勯犲嚱鏁般偮?
銆銆絎簩鍗佷笁錛屽惎鍔ㄤ竴涓嚎紼嬫槸鐢╮un()榪樻槸start()?聽
銆銆鍚姩涓涓嚎紼嬫槸璋冪敤start()鏂規硶錛屼嬌綰跨▼鎵浠h〃鐨勮櫄鎷熷鐞嗘満澶勪簬鍙繍琛岀姸鎬侊紝榪欐剰鍛崇潃瀹冨彲浠ョ敱JVM璋冨害騫舵墽琛屻傝繖騫朵笉鎰忓懗鐫綰跨▼灝變細绔嬪嵆榪愯銆俽un()鏂規硶鍙互浜х敓蹇呴』閫鍑虹殑鏍囧織鏉ュ仠姝竴涓嚎紼嬨偮?
銆銆絎簩鍗佸洓錛屾瀯閫犲櫒Constructor鏄惁鍙override?聽
銆銆鏋勯犲櫒Constructor涓嶈兘琚戶鎵匡紝鍥犳涓嶈兘閲嶅啓Overriding錛屼絾鍙互琚噸杞絆verloading銆偮?
銆銆絎簩鍗佷簲錛屾槸鍚﹀彲浠ョ戶鎵縎tring綾?聽
銆銆String綾繪槸final綾繪晠涓嶅彲浠ョ戶鎵褲偮?
銆銆絎簩鍗佸叚錛屽綋涓涓嚎紼嬭繘鍏ヤ竴涓璞$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?聽
銆銆涓嶈兘錛屼竴涓璞$殑涓涓猻ynchronized鏂規硶鍙兘鐢變竴涓嚎紼嬭闂偮?
銆銆絎簩鍗佷竷錛宼ry聽{}閲屾湁涓涓猺eturn璇彞錛岄偅涔堢揣璺熷湪榪欎釜try鍚庣殑finally聽{}閲岀殑code浼氫笉浼氳鎵ц錛屼粈涔堟椂鍊欒鎵ц錛屽湪return鍓嶈繕鏄悗?聽
銆銆浼氭墽琛岋紝鍦╮eturn鍓嶆墽琛屻偮?
銆銆絎簩鍗佸叓錛岀紪紼嬮:聽鐢ㄦ渶鏈夋晥鐜囩殑鏂規硶綆楀嚭2涔樹互8絳夋柤鍑?聽
銆銆鏈塁鑳屾櫙鐨勭▼搴忓憳鐗瑰埆鍠滄闂繖縐嶉棶棰樸偮?
銆銆2聽<<聽3聽
銆銆絎簩鍗佷節錛屼袱涓璞″肩浉鍚?x.equals(y)聽==聽true)錛屼絾鍗村彲鏈変笉鍚岀殑hash聽code錛岃繖鍙ヨ瘽瀵逛笉瀵?聽
銆銆涓嶅錛屾湁鐩稿悓鐨刪ash聽code銆偮?
銆銆絎笁鍗侊紝褰撲竴涓璞¤褰撲綔鍙傛暟浼犻掑埌涓涓柟娉曞悗錛屾鏂規硶鍙敼鍙樿繖涓璞$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?聽
銆銆鏄間紶閫掋侸ava聽緙栫▼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偮?
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?聽
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聽switch聽鍜屄燾ase聽璇彞鐨勫弬鏁板簲璇ユ槸聽int銆伮爏hort銆伮燾har聽鎴栬吢燽yte銆俵ong,string聽閮戒笉鑳戒綔鐢ㄤ簬swtich銆偮?
銆銆絎笁鍗佷簩錛岀紪紼嬮:聽鍐欎竴涓猄ingleton鍑烘潵銆?
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偮?
銆銆涓鑸琒ingleton妯″紡閫氬父鏈夊嚑縐嶇褰㈠紡:聽
銆銆絎竴縐嶅艦寮?聽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叾涓殑鏂規硶銆偮?
public聽class聽Singleton聽{聽
銆銆private聽Singleton(){}聽
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聽
銆銆//娉ㄦ剰榪欐槸private聽鍙緵鍐呴儴璋冪敤聽
銆銆private聽static聽Singleton聽instance聽=聽new聽Singleton();聽
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聽
銆銆public聽static聽Singleton聽getInstance()聽{聽
銆銆銆銆return聽instance;聽銆銆聽
銆銆聽}聽
}聽
銆銆絎簩縐嶅艦寮?聽
public聽class聽Singleton聽{聽
銆銆private聽static聽Singleton聽instance聽=聽null;聽
銆銆public聽static聽synchronized聽Singleton聽getInstance()聽{聽
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°銆銆聽銆聽
銆銆//浣跨敤鏃剁敓鎴愬疄渚嬶紝鎻愰珮浜嗘晥鐜囷紒聽
銆銆if聽(instance==null)聽
銆銆銆銆instance錛漬ew聽Singleton();聽
return聽instance;聽銆銆}聽
}聽
銆銆鍏朵粬褰㈠紡:聽
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鐨勩偮?
銆銆涓鑸涓虹涓縐嶅艦寮忚鏇村姞瀹夊叏浜浡?
銆銆絎笁鍗佷笁聽Hashtable鍜孒ashMap聽
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聽interface鐨勪竴涓疄鐜奧?
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涓嶅厑璁嘎?
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銆偮?
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灝卞繀欏諱負涔嬫彁渚涘鍚屾銆偮?
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?

]]>
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