锘??xml version="1.0" encoding="utf-8" standalone="yes"?>亚洲国产乱码最新视频 ,亚洲av日韩av天堂影片精品,亚洲成AV人在线观看网址http://www.tkk7.com/channing/zh-cnMon, 12 May 2025 11:32:35 GMTMon, 12 May 2025 11:32:35 GMT60姣忎釜鍒濆鑰呴兘搴旇鎼炴噦鐨勯棶棰?/title><link>http://www.tkk7.com/channing/archive/2005/02/14/1168.html</link><dc:creator>channing</dc:creator><author>channing</author><pubDate>Mon, 14 Feb 2005 06:37:00 GMT</pubDate><guid>http://www.tkk7.com/channing/archive/2005/02/14/1168.html</guid><wfw:comment>http://www.tkk7.com/channing/comments/1168.html</wfw:comment><comments>http://www.tkk7.com/channing/archive/2005/02/14/1168.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/channing/comments/commentRss/1168.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/channing/services/trackbacks/1168.html</trackback:ping><description><![CDATA[<P>銆愮粡鍏告帹鑽愩戞瘡涓垵瀛﹁呴兘搴旇鎼炴噦鐨勯棶棰橈紒 <BR>瀵逛簬榪欎釜緋誨垪閲岀殑闂錛屾瘡涓Java鐨勪漢閮藉簲璇ユ悶鎳傘傚綋鐒訛紝濡傛灉鍙槸瀛ava鐜╃帺灝辨棤鎵璋撲簡銆傚鏋滀綘璁や負鑷繁宸茬粡瓚呰秺鍒濆鑰呬簡錛屽嵈涓嶅緢鎳傝繖浜涢棶棰橈紝璇峰皢浣犺嚜宸遍噸褰掑垵瀛﹁呰鍒椼傚唴瀹瑰潎鏉ヨ嚜浜嶤SDN鐨勭粡鍏歌佽創銆?/P> <P>闂涓錛氭垜澹版槑浜嗕粈涔堬紒</P> <P>String s = "Hello world!";</P> <P>璁稿浜洪兘鍋氳繃榪欐牱鐨勪簨鎯咃紝浣嗘槸錛屾垜浠埌搴曞０鏄庝簡浠涔堬紵鍥炵瓟閫氬父鏄細涓涓猄tring錛屽唴瀹規槸鈥淗ello world!鈥濄傝繖鏍鋒ā緋婄殑鍥炵瓟閫氬父鏄蹇典笉娓呯殑鏍規簮銆傚鏋滆鍑嗙‘鐨勫洖絳旓紝涓鍗婄殑浜哄ぇ姒備細鍥炵瓟閿欒銆?BR>榪欎釜璇彞澹版槑鐨勬槸涓涓寚鍚戝璞＄殑寮曠敤錛屽悕涓衡渟鈥濓紝鍙互鎸囧悜綾誨瀷涓篠tring鐨勪換浣曞璞★紝鐩墠鎸囧悜"Hello world!"榪欎釜String綾誨瀷鐨勫璞°傝繖灝辨槸鐪熸鍙戠敓鐨勪簨鎯呫傛垜浠茍娌℃湁澹版槑涓涓猄tring瀵硅薄錛屾垜浠彧鏄０鏄庝簡涓涓彧鑳芥寚鍚慡tring瀵硅薄鐨勫紩鐢ㄥ彉閲忋傛墍浠ワ紝濡傛灉鍦ㄥ垰鎵嶉偅鍙ヨ鍙ュ悗闈紝濡傛灉鍐嶈繍琛屼竴鍙ワ細</P> <P>String string = s;</P> <P>鎴戜滑鏄０鏄庝簡鍙﹀涓涓彧鑳芥寚鍚慡tring瀵硅薄鐨勫紩鐢紝鍚嶄負string錛屽茍娌℃湁絎簩涓璞′駭鐢燂紝string榪樻槸鎸囧悜鍘熸潵閭ｄ釜瀵硅薄錛屼篃灝辨槸錛屽拰s鎸囧悜鍚屼竴涓璞°?/P> <P>闂浜岋細"=="鍜宔quals鏂規硶絀剁珶鏈変粈涔堝尯鍒紵</P> <P>==鎿嶄綔絎︿笓闂ㄧ敤鏉ユ瘮杈冨彉閲忕殑鍊兼槸鍚︾浉絳夈傛瘮杈冨ソ鐞嗚В鐨勪竴鐐規槸錛?BR>int a=10;<BR>int b=10;<BR>鍒檃==b灝嗘槸true銆?BR>浣嗕笉濂界悊瑙ｇ殑鍦版柟鏄細<BR>String a=new String("foo");<BR>String b=new String("foo");<BR>鍒檃==b灝嗚繑鍥瀎alse銆?/P> <P>鏍規嵁鍓嶄竴甯栬榪囷紝瀵硅薄鍙橀噺鍏跺疄鏄竴涓紩鐢紝瀹冧滑鐨勫兼槸鎸囧悜瀵硅薄鎵鍦ㄧ殑鍐呭瓨鍦板潃錛岃屼笉鏄璞℃湰韜俛鍜宐閮戒嬌鐢ㄤ簡new鎿嶄綔絎︼紝鎰忓懗鐫灝嗗湪鍐呭瓨涓駭鐢熶袱涓唴瀹逛負"foo"鐨勫瓧絎︿覆錛屾棦鐒舵槸鈥滀袱涓濓紝瀹冧滑鑷劧浣嶄簬涓嶅悓鐨勫唴瀛樺湴鍧銆俛鍜宐鐨勫煎叾瀹炴槸涓や釜涓嶅悓鐨勫唴瀛樺湴鍧鐨勫鹼紝鎵浠ヤ嬌鐢?=="鎿嶄綔絎︼紝緇撴灉浼氭槸false銆傝瘹鐒訛紝a鍜宐鎵鎸囩殑瀵硅薄錛屽畠浠殑鍐呭閮芥槸"foo"錛屽簲璇ユ槸鈥滅浉絳夆濓紝浣嗘槸==鎿嶄綔絎﹀茍涓嶆秹鍙婂埌瀵硅薄鍐呭鐨勬瘮杈冦?BR>瀵硅薄鍐呭鐨勬瘮杈冿紝姝ｆ槸equals鏂規硶鍋氱殑浜嬨?/P> <P>鐪嬩竴涓婳bject瀵硅薄鐨別quals鏂規硶鏄浣曞疄鐜扮殑錛?BR>boolean equals(Object o){</P> <P>return this==o;</P> <P>}<BR>Object瀵硅薄榛樿浣跨敤浜?=鎿嶄綔絎︺傛墍浠ュ鏋滀綘鑷垱鐨勭被娌℃湁瑕嗙洊equals鏂規硶錛岄偅浣犵殑綾諱嬌鐢╡quals鍜屼嬌鐢?=浼氬緱鍒板悓鏍風殑緇撴灉銆傚悓鏍蜂篃鍙互鐪嬪嚭錛孫bject鐨別quals鏂規硶娌℃湁杈懼埌equals鏂規硶搴旇杈懼埌鐨勭洰鏍囷細姣旇緝涓や釜瀵硅薄鍐呭鏄惁鐩哥瓑銆傚洜涓虹瓟妗堝簲璇ョ敱綾葷殑鍒涘緩鑰呭喅瀹氾紝鎵浠bject鎶婅繖涓換鍔＄暀緇欎簡綾葷殑鍒涘緩鑰呫?/P> <P>鐪嬩竴涓嬩竴涓瀬绔殑綾伙細<BR>Class Monster{<BR>private String content;<BR>...<BR>boolean equals(Object another){ return true;}</P> <P>}<BR>鎴戣鐩栦簡equals鏂規硶銆傝繖涓疄鐜頒細瀵艱嚧鏃犺Monster瀹炰緥鍐呭濡備綍錛屽畠浠箣闂寸殑姣旇緝姘歌繙榪斿洖true銆?/P> <P>鎵浠ュ綋浣犳槸鐢╡quals鏂規硶鍒ゆ柇瀵硅薄鐨勫唴瀹規槸鍚︾浉絳夛紝璇蜂笉瑕佹兂褰撶劧銆傚洜涓哄彲鑳戒綘璁や負鐩哥瓑錛岃岃繖涓被鐨勪綔鑰呬笉榪欐牱璁や負錛岃岀被鐨別quals鏂規硶鐨勫疄鐜版槸鐢變粬鎺屾彙鐨勩傚鏋滀綘闇瑕佷嬌鐢╡quals鏂規硶錛屾垨鑰呬嬌鐢ㄤ換浣曞熀浜庢暎鍒楃爜鐨勯泦鍚堬紙HashSet,HashMap,HashTable錛夛紝璇峰療鐪嬩竴涓媕ava doc浠ョ‘璁よ繖涓被鐨別quals閫昏緫鏄浣曞疄鐜扮殑銆?/P> <P>闂涓夛細String鍒板簳鍙樹簡娌℃湁錛?/P> <P>娌℃湁銆傚洜涓篠tring琚璁℃垚涓嶅彲鍙?immutable)綾伙紝鎵浠ュ畠鐨勬墍鏈夊璞￠兘鏄笉鍙彉瀵硅薄銆傝鐪嬩笅鍒椾唬鐮侊細</P> <P>String s = "Hello";<BR>s = s + " world!";</P> <P>s鎵鎸囧悜鐨勫璞℃槸鍚︽敼鍙樹簡鍛紵浠庢湰緋誨垪絎竴綃囩殑緇撹寰堝鏄撳鍑鴻繖涓粨璁恒傛垜浠潵鐪嬬湅鍙戠敓浜嗕粈涔堜簨鎯呫傚湪榪欐浠ｇ爜涓紝s鍘熷厛鎸囧悜涓涓猄tring瀵硅薄錛屽唴瀹規槸"Hello"錛岀劧鍚庢垜浠s榪涜浜?鎿嶄綔錛岄偅涔坰鎵鎸囧悜鐨勯偅涓璞℃槸鍚﹀彂鐢熶簡鏀瑰彉鍛紵絳旀鏄病鏈夈傝繖鏃訛紝s涓嶆寚鍚戝師鏉ラ偅涓璞′簡錛岃屾寚鍚戜簡鍙︿竴涓猄tring瀵硅薄錛屽唴瀹逛負"Hello world!"錛屽師鏉ラ偅涓璞¤繕瀛樺湪浜庡唴瀛樹箣涓紝鍙槸s榪欎釜寮曠敤鍙橀噺涓嶅啀鎸囧悜瀹冧簡銆?BR>閫氳繃涓婇潰鐨勮鏄庯紝鎴戜滑寰堝鏄撳鍑哄彟涓涓粨璁猴紝濡傛灉緇忓父瀵瑰瓧絎︿覆榪涜鍚勭鍚勬牱鐨勪慨鏀癸紝鎴栬呰錛屼笉鍙瑙佺殑淇敼錛岄偅涔堜嬌鐢⊿tring鏉ヤ唬琛ㄥ瓧絎︿覆鐨勮瘽浼氬紩璧峰緢澶х殑鍐呭瓨寮閿銆傚洜涓篠tring瀵硅薄寤虹珛涔嬪悗涓嶈兘鍐嶆敼鍙橈紝鎵浠ュ浜庢瘡涓涓笉鍚岀殑瀛楃涓詫紝閮介渶瑕佷竴涓猄tring瀵硅薄鏉ヨ〃紺恒傝繖鏃訛紝搴旇鑰冭檻浣跨敤StringBuffer綾伙紝瀹冨厑璁鎬慨鏀癸紝鑰屼笉鏄瘡涓笉鍚岀殑瀛楃涓查兘瑕佺敓鎴愪竴涓柊鐨勫璞°傚茍涓旓紝榪欎袱縐嶇被鐨勫璞¤漿鎹㈠崄鍒嗗鏄撱?BR>鍚屾椂錛屾垜浠繕鍙互鐭ラ亾錛屽鏋滆浣跨敤鍐呭鐩稿悓鐨勫瓧絎︿覆錛屼笉蹇呮瘡嬈￠兘new涓涓猄tring銆備緥濡傛垜浠鍦ㄦ瀯閫犲櫒涓涓涓悕鍙玸鐨凷tring寮曠敤鍙橀噺榪涜鍒濆鍖栵紝鎶婂畠璁劇疆涓哄垵濮嬪鹼紝搴斿綋榪欐牱鍋氾細<BR>public class Demo {<BR>  private String s;<BR>  ...<BR>  public Demo {<BR>    s = "Initial value";<BR>  }<BR>  ...<BR>}<BR>鑰岄潪<BR>s = new String("Initial value");<BR>鍚庤呮瘡嬈￠兘浼氳皟鐢ㄦ瀯閫犲櫒錛岀敓鎴愭柊瀵硅薄錛屾ц兘浣庝笅涓斿唴瀛樺紑閿澶э紝騫朵笖娌℃湁鎰忎箟錛屽洜涓篠tring瀵硅薄涓嶅彲鏀瑰彉錛屾墍浠ュ浜庡唴瀹圭浉鍚岀殑瀛楃涓詫紝鍙涓涓猄tring瀵硅薄鏉ヨ〃紺哄氨鍙互浜嗐備篃灝辮錛屽嬈¤皟鐢ㄤ笂闈㈢殑鏋勯犲櫒鍒涘緩澶氫釜瀵硅薄錛屼粬浠殑String綾誨瀷灞炴閮芥寚鍚戝悓涓涓璞°?BR>涓婇潰鐨勭粨璁鴻繕鍩轟簬榪欐牱涓涓簨瀹烇細瀵逛簬瀛楃涓插父閲忥紝濡傛灉鍐呭鐩稿悓錛孞ava璁や負瀹冧滑浠ｈ〃鍚屼竴涓猄tring瀵硅薄銆傝岀敤鍏抽敭瀛梟ew璋冪敤鏋勯犲櫒錛屾繪槸浼氬垱寤轟竴涓柊鐨勫璞★紝鏃犺鍐呭鏄惁鐩稿悓銆?BR>鑷充簬涓轟粈涔堣鎶奡tring綾昏璁℃垚涓嶅彲鍙樼被錛屾槸瀹冪殑鐢ㄩ斿喅瀹氱殑銆傚叾瀹炰笉鍙猄tring錛屽緢澶欽ava鏍囧噯綾誨簱涓殑綾婚兘鏄笉鍙彉鐨勩傚湪寮鍙戜竴涓郴緇熺殑鏃跺欙紝鎴戜滑鏈夋椂鍊欎篃闇瑕佽璁′笉鍙彉綾伙紝鏉ヤ紶閫掍竴緇勭浉鍏崇殑鍊鹼紝榪欎篃鏄潰鍚戝璞℃濇兂鐨勪綋鐜般備笉鍙彉綾繪湁涓浜涗紭鐐癸紝姣斿鍥犱負瀹冪殑瀵硅薄鏄彧璇葷殑錛屾墍浠ュ綰跨▼騫跺彂璁塊棶涔熶笉浼氭湁浠諱綍闂銆傚綋鐒朵篃鏈変竴浜涚己鐐癸紝姣斿姣忎釜涓嶅悓鐨勭姸鎬侀兘瑕佷竴涓璞℃潵浠ｈ〃錛屽彲鑳戒細閫犳垚鎬ц兘涓婄殑闂銆傛墍浠ava鏍囧噯綾誨簱榪樻彁渚涗簡涓涓彲鍙樼増鏈紝鍗砈tringBuffer銆?/P> <P>闂鍥涳細final鍏抽敭瀛楀埌搴曚慨楗頒簡浠涔堬紵</P> <P>final浣垮緱琚慨楗扮殑鍙橀噺"涓嶅彉"錛屼絾鏄敱浜庡璞″瀷鍙橀噺鐨勬湰璐ㄦ槸鈥滃紩鐢ㄢ濓紝浣垮緱鈥滀笉鍙樷濅篃鏈変簡涓ょ鍚箟錛氬紩鐢ㄦ湰韜殑涓嶅彉錛屽拰寮曠敤鎸囧悜鐨勫璞′笉鍙樸?/P> <P>寮曠敤鏈韓鐨勪笉鍙橈細<BR>final StringBuffer a=new StringBuffer("immutable");<BR>final StringBuffer b=new StringBuffer("not immutable");<BR>a=b;//緙栬瘧鏈熼敊璇?/P> <P>寮曠敤鎸囧悜鐨勫璞′笉鍙橈細<BR>final StringBuffer a=new StringBuffer("immutable");<BR>a.append(" broken!"); //緙栬瘧閫氳繃</P> <P>鍙錛宖inal鍙寮曠敤鐨勨滃尖?涔熷嵆瀹冩墍鎸囧悜鐨勯偅涓璞＄殑鍐呭瓨鍦板潃)鏈夋晥錛屽畠榪嬌寮曠敤鍙兘鎸囧悜鍒濆鎸囧悜鐨勯偅涓璞★紝鏀瑰彉瀹冪殑鎸囧悜浼氬鑷寸紪璇戞湡閿欒銆傝嚦浜庡畠鎵鎸囧悜鐨勫璞＄殑鍙樺寲錛宖inal鏄笉璐熻矗鐨勩傝繖寰堢被浼?=鎿嶄綔絎︼細==鎿嶄綔絎﹀彧璐熻矗寮曠敤鐨勨滃尖濈浉絳夛紝鑷充簬榪欎釜鍦板潃鎵鎸囧悜鐨勫璞″唴瀹規槸鍚︾浉絳夛紝==鎿嶄綔絎︽槸涓嶇鐨勩?/P> <P>鐞嗚Вfinal闂鏈夊緢閲嶈鐨勫惈涔夈傝澶氱▼搴忔紡媧為兘鍩轟簬姝?---final鍙兘淇濊瘉寮曠敤姘歌繙鎸囧悜鍥哄畾瀵硅薄錛屼笉鑳戒繚璇侀偅涓璞＄殑鐘舵佷笉鍙樸傚湪澶氱嚎紼嬬殑鎿嶄綔涓?涓涓璞′細琚涓嚎紼嬪叡浜垨淇敼錛屼竴涓嚎紼嬪瀵硅薄鏃犳剰璇嗙殑淇敼鍙兘浼氬鑷村彟涓涓嬌鐢ㄦ瀵硅薄鐨勭嚎紼嬪穿婧冦備竴涓敊璇殑瑙ｅ喅鏂規硶灝辨槸鍦ㄦ瀵硅薄鏂板緩鐨勬椂鍊欐妸瀹冨０鏄庝負final錛屾剰鍥句嬌寰楀畠鈥滄案榪滀笉鍙樷濄傚叾瀹為偅鏄緬鍔崇殑銆?/P> <P>闂浜旓細鍒板簳瑕佹庝箞鏍峰垵濮嬪寲錛?/P> <P>鏈棶棰樿璁哄彉閲忕殑鍒濆鍖栵紝鎵浠ュ厛鏉ョ湅涓涓婮ava涓湁鍝簺縐嶇被鐨勫彉閲忋?BR>1. 綾葷殑灞炴э紝鎴栬呭彨鍊煎煙<BR>2. 鏂規硶閲岀殑灞閮ㄥ彉閲?BR>3. 鏂規硶鐨勫弬鏁?/P> <P>瀵逛簬絎竴縐嶅彉閲忥紝Java铏氭嫙鏈轟細鑷姩榪涜鍒濆鍖栥傚鏋滅粰鍑轟簡鍒濆鍊鹼紝鍒欏垵濮嬪寲涓鴻鍒濆鍊箋傚鏋滄病鏈夌粰鍑猴紝鍒欐妸瀹冨垵濮嬪寲涓鴻綾誨瀷鍙橀噺鐨勯粯璁ゅ垵濮嬪箋?/P> <P>int綾誨瀷鍙橀噺榛樿鍒濆鍊間負0<BR>float綾誨瀷鍙橀噺榛樿鍒濆鍊間負0.0f<BR>double綾誨瀷鍙橀噺榛樿鍒濆鍊間負0.0<BR>boolean綾誨瀷鍙橀噺榛樿鍒濆鍊間負false<BR>char綾誨瀷鍙橀噺榛樿鍒濆鍊間負0(ASCII鐮?<BR>long綾誨瀷鍙橀噺榛樿鍒濆鍊間負0<BR>鎵鏈夊璞″紩鐢ㄧ被鍨嬪彉閲忛粯璁ゅ垵濮嬪間負null錛屽嵆涓嶆寚鍚戜換浣曞璞°傛敞鎰忔暟緇勬湰韜篃鏄璞★紝鎵浠ユ病鏈夊垵濮嬪寲鐨勬暟緇勫紩鐢ㄥ湪鑷姩鍒濆鍖栧悗鍏跺間篃鏄痭ull銆?/P> <P>瀵逛簬涓ょ涓嶅悓鐨勭被灞炴э紝static灞炴т笌instance灞炴э紝鍒濆鍖栫殑鏃舵満鏄笉鍚岀殑銆俰nstance灞炴у湪鍒涘緩瀹炰緥鐨勬椂鍊欏垵濮嬪寲錛宻tatic灞炴у湪綾誨姞杞斤紝涔熷氨鏄涓嬈＄敤鍒拌繖涓被鐨勬椂鍊欏垵濮嬪寲錛屽浜庡悗鏉ョ殑瀹炰緥鐨勫垱寤猴紝涓嶅啀嬈¤繘琛屽垵濮嬪寲銆傝繖涓棶棰樹細鍦ㄤ互鍚庣殑緋誨垪涓繘琛岃緇嗚璁恒?/P> <P>瀵逛簬絎簩縐嶅彉閲忥紝蹇呴』鏄庣‘鍦拌繘琛屽垵濮嬪寲銆傚鏋滃啀娌℃湁鍒濆鍖栦箣鍓嶅氨璇曞浘浣跨敤瀹冿紝緙栬瘧鍣ㄤ細鎶楄銆傚鏋滃垵濮嬪寲鐨勮鍙ュ湪try鍧椾腑鎴杋f鍧椾腑錛屼篃蹇呴』瑕佽瀹冨湪絎竴嬈′嬌鐢ㄥ墠涓瀹氳兘澶熷緱鍒拌祴鍊箋備篃灝辨槸璇達紝鎶婂垵濮嬪寲璇彞鏀懼湪鍙湁if鍧楃殑鏉′歡鍒ゆ柇璇彞涓紪璇戝櫒涔熶細鎶楄錛屽洜涓烘墽琛岀殑鏃跺欏彲鑳戒笉絎﹀悎if鍚庨潰鐨勫垽鏂潯浠訛紝濡傛涓鏉ュ垵濮嬪寲璇彞灝變笉浼氳鎵ц浜嗭紝榪欏氨榪濆弽浜嗗眬閮ㄥ彉閲忎嬌鐢ㄥ墠蹇呴』鍒濆鍖栫殑瑙勫畾銆備絾濡傛灉鍦╡lse鍧椾腑涔熸湁鍒濆鍖栬鍙ワ紝灝卞彲浠ラ氳繃緙栬瘧錛屽洜涓烘棤璁哄浣曪紝鎬繪湁鑷沖皯涓鏉″垵濮嬪寲璇彞浼氳鎵ц錛屼笉浼氬彂鐢熶嬌鐢ㄥ墠鏈鍒濆鍖栫殑浜嬫儏銆傚浜巘ry-catch涔熸槸涓鏍鳳紝濡傛灉鍙湁鍦╰ry鍧楅噷鎵嶆湁鍒濆鍖栬鍙ワ紝緙栬瘧閮ㄩ氳繃銆傚鏋滃湪catch鎴杅inally閲屼篃鏈夛紝鍒欏彲浠ラ氳繃緙栬瘧銆傛諱箣錛岃淇濊瘉灞閮ㄥ彉閲忓湪浣跨敤涔嬪墠涓瀹氳鍒濆鍖栦簡銆傛墍浠ワ紝涓涓ソ鐨勫仛娉曟槸鍦ㄥ０鏄庝粬浠殑鏃跺欏氨鍒濆鍖栦粬浠紝濡傛灉涓嶇煡閬撹鍑轟簨鍖栨垚浠涔堝煎ソ錛屽氨鐢ㄤ笂闈㈢殑榛樿鍊煎惂錛?/P> <P>鍏跺疄絎笁縐嶅彉閲忓拰絎簩縐嶆湰璐ㄤ笂鏄竴鏍風殑錛岄兘鏄柟娉曚腑鐨勫眬閮ㄥ彉閲忋傚彧涓嶈繃浣滀負鍙傛暟錛岃偗瀹氭槸琚垵濮嬪寲榪囩殑錛屼紶鍏ョ殑鍊煎氨鏄垵濮嬪鹼紝鎵浠ヤ笉闇瑕佸垵濮嬪寲銆?/P> <P>闂鍏細instanceof鏄粈涔堜笢涓滐紵</P> <P>instanceof鏄疛ava鐨勪竴涓簩鍏冩搷浣滅錛屽拰==錛?gt;錛?lt;鏄悓涓綾諱笢涓溿傜敱浜庡畠鏄敱瀛楁瘝緇勬垚鐨勶紝鎵浠ヤ篃鏄疛ava鐨勪繚鐣欏叧閿瓧銆傚畠鐨勪綔鐢ㄦ槸嫻嬭瘯瀹冨乏杈圭殑瀵硅薄鏄惁鏄畠鍙寵竟鐨勭被鐨勫疄渚嬶紝榪斿洖boolean綾誨瀷鐨勬暟鎹備婦涓緥瀛愶細</P> <P>String s = "I AM an Object!";<BR>boolean isObject = s instanceof Object;</P> <P>鎴戜滑澹版槑浜嗕竴涓猄tring瀵硅薄寮曠敤錛屾寚鍚戜竴涓猄tring瀵硅薄錛岀劧鍚庣敤instancof鏉ユ祴璇曞畠鎵鎸囧悜鐨勫璞℃槸鍚︽槸Object綾葷殑涓涓疄渚嬶紝鏄劇劧錛岃繖鏄湡鐨勶紝鎵浠ヨ繑鍥瀟rue錛屼篃灝辨槸isObject鐨勫間負True銆?BR>instanceof鏈変竴浜涚敤澶勩傛瘮濡傛垜浠啓浜嗕竴涓鐞嗚處鍗曠殑緋葷粺錛屽叾涓湁榪欐牱涓変釜綾伙細</P> <P>public class Bill {//鐪佺暐緇嗚妭}<BR>public class PhoneBill extends Bill {//鐪佺暐緇嗚妭}<BR>public class GasBill extends Bill {//鐪佺暐緇嗚妭}</P> <P>鍦ㄥ鐞嗙▼搴忛噷鏈変竴涓柟娉曪紝鎺ュ彈涓涓狟ill綾誨瀷鐨勫璞★紝璁＄畻閲戦銆傚亣璁句袱縐嶈處鍗曡綆楁柟娉曚笉鍚岋紝鑰屼紶鍏ョ殑Bill瀵硅薄鍙兘鏄袱縐嶄腑鐨勪換浣曚竴縐嶏紝鎵浠ヨ鐢╥nstanceof鏉ュ垽鏂細</P> <P>public double calculate(Bill bill) {<BR>  if (bill instanceof PhoneBill) {<BR>    //璁＄畻鐢佃瘽璐﹀崟<BR>  }<BR>  if (bill instanceof GasBill) {<BR>    //璁＄畻鐕冩皵璐﹀崟<BR>  }<BR>  ...<BR>}<BR>榪欐牱灝卞彲浠ョ敤涓涓柟娉曞鐞嗕袱縐嶅瓙綾匯?/P> <P>鐒惰岋紝榪欑鍋氭硶閫氬父琚涓烘槸娌℃湁濂藉ソ鍒╃敤闈㈠悜瀵硅薄涓殑澶氭佹с傚叾瀹炰笂闈㈢殑鍔熻兘瑕佹眰鐢ㄦ柟娉曢噸杞藉畬鍏ㄥ彲浠ュ疄鐜幫紝榪欐槸闈㈠悜瀵硅薄鍙樻垚搴旀湁鐨勫仛娉曪紝閬垮厤鍥炲埌緇撴瀯鍖栫紪紼嬫ā寮忋傚彧瑕佹彁渚涗袱涓悕瀛楀拰榪斿洖鍊奸兘鐩稿悓錛屾帴鍙楀弬鏁扮被鍨嬩笉鍚岀殑鏂規硶灝卞彲浠ヤ簡錛?/P> <P>public double calculate(PhoneBill bill) {<BR>  //璁＄畻鐢佃瘽璐﹀崟<BR>}</P> <P>public double calculate(GasBill bill) {<BR>  //璁＄畻鐕冩皵璐﹀崟<BR>}</P> <P>鎵浠ワ紝浣跨敤instanceof鍦ㄧ粷澶у鏁版儏鍐典笅騫朵笉鏄帹鑽愮殑鍋氭硶錛屽簲褰撳ソ濂藉埄鐢ㄥ鎬?<BR></P><img src ="http://www.tkk7.com/channing/aggbug/1168.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/channing/" target="_blank">channing</a> 2005-02-14 14:37 <a href="http://www.tkk7.com/channing/archive/2005/02/14/1168.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>涓嬪畾鍐沖績錛孞AVA浠庨浂寮濮嬶紒http://www.tkk7.com/channing/archive/2005/02/03/941.htmlchanningchanningThu, 03 Feb 2005 02:42:00 GMThttp://www.tkk7.com/channing/archive/2005/02/03/941.htmlhttp://www.tkk7.com/channing/comments/941.htmlhttp://www.tkk7.com/channing/archive/2005/02/03/941.html#Feedback5http://www.tkk7.com/channing/comments/commentRss/941.htmlhttp://www.tkk7.com/channing/services/trackbacks/941.html   緇堜簬瑕佹瘯涓氫簡錛岀幇鍦ㄥ湪涓瀹惰蔣浠跺叕鍙擱噷瀹炰範銆傜幇鍦ㄥ伐浣滀簡鎵嶅彂瑙夎嚜宸辨湁寰堝涓嶈凍鐨勫湴鏂廣傚洜涓烘槸灝忓叕鍙革紝鎵浠ラ兘鏄敤JAVA緙栧啓浠ｇ爜鐨勶紝鍛靛懙錛岃寰楄嚜宸辮惤浼嶅挴銆傝櫧鐒跺湪瀛︽牎瀛﹁繃鐐癸紝浣嗕篃鍙槸鍋滅暀鍦ㄨ浜嬫湰+JDK鐨勬按騫熾傚搸~~~錛屼功鍒扮敤鏃舵柟鎭ㄥ皯鍟婏紒鍐沖績鍦↗AVA鏂歸潰鏈変竴鐣綔涓猴紝甯屾湜鑳藉敖蹇啓鍑鴻嚜宸辯涓涓薄鏍風殑紼嬪簭錛屽懙鍛碉紒

channing 2005-02-03 10:42 鍙戣〃璇勮
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