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Eclipse3.1涓綋楠孞2SE5.0涔嬫硾鍨?緇勫浘)http://www.tkk7.com/xpsir/articles/21926.html灝廝灝廝Wed, 30 Nov 2005 03:36:00 GMThttp://www.tkk7.com/xpsir/articles/21926.htmlhttp://www.tkk7.com/xpsir/comments/21926.htmlhttp://www.tkk7.com/xpsir/articles/21926.html#Feedback0http://www.tkk7.com/xpsir/comments/commentRss/21926.htmlhttp://www.tkk7.com/xpsir/services/trackbacks/21926.html銆銆娉涘瀷(Generics)綆浠?/B>
銆銆
銆銆J2SE 5.0涓殑鏈鏄捐憲鐨勫彉鍖栦箣涓鏄坊鍔犲娉涘瀷綾誨瀷鐨勬敮鎸? 鍦↗2SE 1.4 浠ュ強涔嬪墠鐨勭増鏈腑, Java紼嬪簭騫朵笉鏄被鍨嬪畨鍏ㄧ殑. 渚嬪, Collection framework涓畾涔夌殑List, Map絳夊鍣ㄧ被鐨勫厓绱犻兘鏄疧bject綾誨瀷, 鍗寵繖涓被鍖呭惈鐨勫厓绱犳槸Object瀵硅薄. 浣跨敤榪欑鏂瑰紡瀹炵幇鐨勫垪琛? 鍙互鐢ㄦ潵鎿嶄綔鏁存暟, 瀹炴暟, 瀛楃涓叉垨鑰呬換浣曞璞$被鍨? 渚嬪
銆銆
銆銆娓呭崟1.1 綾誨瀷涓嶅畨鍏ㄧ殑浠g爜紺轟緥
銆銆
銆銆List stringList = new ArrayList();
銆銆stringList.add("abcde");
銆銆String str = (String)stringList.get(0);
銆銆
銆銆榪欑鏂規硶瀹炵幇鐨勫垪琛ㄩ渶瑕佷嬌鐢ㄥ己鍒剁被鍨嬭漿鎹?鍙堢О鏄劇ず閫犲瀷), 鍥犳涓嶆槸綾誨瀷瀹夊叏鐨? 鍦ㄤ笂闈㈣繖孌典唬鐮佺, 铏界劧鍙橀噺鍚嶄負stringList, 浣嗘槸鎴戜滑浠嶇劧鍙互鎶婁竴涓暣鍨嬪璞℃坊鍔犲埌榪欎釜闃熷垪涓? 渚嬪,
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銆銆娓呭崟1.2 綾誨瀷涓嶅畨鍏ㄧ殑浠g爜紺轟緥
銆銆
銆銆stringList.add(new Integer(5));
銆銆
銆銆鍦ㄨ繖縐嶆儏鍐典笅, 浠庡瓧絎﹀垪琛ㄤ腑鑾峰彇瀵硅薄鏃? 寮哄埗綾誨瀷杞崲灝變細瀵艱嚧榪愯鏃跺紓甯?
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銆銆娓呭崟1.3 綾誨瀷涓嶅畨鍏ㄧ殑浠g爜紺轟緥
銆銆
銆銆String str = (String)stringList.get(1); //runtime exception
銆銆
銆銆娉涘瀷鏄疛ava榪堝悜綾誨瀷瀹夊叏鐨勪竴涓噸瑕佹楠? 浣跨敤娉涘瀷鍙互鏋勯犲嚭綾誨瀷瀹夊叏鐨勪唬鐮?
銆銆
銆銆澹版槑娉涘瀷
銆銆
銆銆鎵璋撴硾鍨嬫槸鎸囩被鍨嬪弬鏁板寲(parameterized types). Java鏄竴縐嶅己綾誨瀷鐨勮璦, 鍦↗2SE 1.4浠ュ強浠ュ墠鐨勭増鏈腑, 鎴戜滑鍦ㄥ畾涔変竴涓狫ava綾? 鎺ュ彛鎴栬呮柟娉曠殑鏃跺? 蹇呴』鎸囧畾鍙橀噺鐨勭被鍨? 鍦ㄥ0鏄庢硾鍨嬬被銆佹帴鍙f垨鑰呭嚱鏁版椂, 瀹氫箟鍙橀噺鐨勬椂鍊欎笉鎸囧畾鏌愪簺鍙橀噺鐨勫叿浣撶被鍨? 鑰屾槸鐢ㄤ竴涓被鍨嬪弬鏁頒唬鏇? 鍦ㄤ嬌鐢ㄨ繖涓被, 鎺ュ彛, 鎴栬呮柟娉曠殑鏃跺? 榪欎釜綾誨瀷鍙傛暟鐢變竴涓叿浣撶被鍨嬫墍浠f浛.
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銆銆2.1 娉涘瀷綾?BR>銆銆
銆銆涓嬮潰鐨勪緥瀛愪腑浠嬬粛浜嗗浣曞垱寤轟竴涓渶綆鍗曟硾鍨嬬被
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銆銆娓呭崟2.1, 鏈綆鍗曠殑娉涘瀷綾?BR>銆銆
銆銆public class GenSample<T> {}
銆銆
銆銆綾誨悕鍚庨潰甯︽湁<T>琛ㄦ槑浜嗚繖涓被鏄硾鍨嬬被, 鍏朵腑T琚垚涓虹被鍨嬪弬鏁?type parameter), 鍦ㄤ嬌鐢ㄦ硾鍨嬬殑鏃跺? 綾誨瀷鍙傛暟鍙互琚浛鎹負浠諱綍鐨勭被綾誨瀷, 浣嗘槸涓嶈兘鏄師濮嬬被鍨?primitive type), 渚嬪int, double.
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銆銆涓嬮潰閫氳繃涓涓垪琛ㄧ殑渚嬪瓙鏉ュ叿浣撹鏄庡鏋滃0鏄庢硾鍨嬬被鍜岀被鍨嬪弬鏁扮殑鐢ㄦ硶.
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銆銆娓呭崟2.2, 娉涘瀷鍒楄〃
銆銆
銆銆public class GenList <T>{
銆銆private T[] elements;
銆銆private int size = 0;
銆銆private int length = 0;
銆銆
銆銆public GenList(int size) {
銆銆elements = (T[])new Object[size];
銆銆this.size = size;
銆銆}
銆銆
銆銆public T get(int i) {
銆銆if (i < length) {
銆銆return elements[i];
銆銆}
銆銆return null;
銆銆}
銆銆
銆銆public void add(T e) {
銆銆if (length < size - 1)
銆銆elements[length++] = e;
銆銆}
銆銆}
銆銆
銆銆鍦ㄥ垪琛ㄧ殑渚嬪瓙涓? 綾誨瀷鍙傛暟T琚敤鏉ヨ〃紺哄垪琛ㄤ腑鐨勫厓绱犵殑綾誨瀷, 鍗? 榪欎釜鍒楄〃涓殑鍏冪礌鏄疶綾誨瀷鐨?
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銆銆鍦ㄤ嬌鐢ㄨ繖涓垪琛ㄦ椂, 榪欎釜綾誨瀷鍙傛暟T浼氳鍏蜂綋鐨勭被鍨嬫墍鏇夸唬.
銆銆
銆銆娉ㄦ剰, 鐢變簬T鏃剁被鍨嬪弬鏁頒笉鏄叿浣撶殑綾? 鎵浠ヤ笉鑳戒嬌鐢╪ew鎿嶄綔絎﹀垱寤篢鐨勫璞?渚嬪new T(), 鎴栬? new T[10].
銆銆
銆銆2.2 娉涘瀷鎺ュ彛
銆銆
銆銆鍦↗2SE 5.0涓? 涓嶄粎浠呭彲浠ュ0鏄庢硾鍨嬬被, 涔熷彲浠ュ0鏄庢硾鍨嬫帴鍙? 澹版槑娉涘瀷鎺ュ彛鍜屽0鏄庢硾鍨嬬被鐨勮娉曠被浼? 涔熸槸鍦ㄦ帴鍙e懡縐板悗闈㈠姞涓?lt;T>. 渚嬪,
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銆銆娓呭崟3.2.3, 娉涘瀷鎺ュ彛
銆銆
銆銆public interface GenInterface<T> {
銆銆void func(T t);
銆銆}
銆銆
銆銆2.3銆佸0鏄庡涓被鍨嬪弬鏁扮殑娉涘瀷綾繪垨鑰呮帴鍙?BR>銆銆
銆銆鍦ㄥ0鏄庢硾鍨嬬被鐨勬椂鍊? 鍙槸浣跨敤澶氫釜綾誨瀷鍙傛暟. 澶氫釜綾誨瀷鍙傛暟涔嬮棿鐢ㄩ楀彿鍒嗗紑, 渚嬪,
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銆銆娓呭崟3.2.4, 澶氫釜綾誨瀷鍙傛暟鐨勬硾鍨嬬被
銆銆
銆銆public class GenMap<T, V> {}
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銆銆Eclipse 3.1鐨勭被鍒涘緩鍚戝鏀寔鍒涘緩娉涘瀷綾? 濡備笅鍥炬墍紺?
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銆銆鍥?.1 浣跨敤綾誨悜瀵煎垱寤烘硾鍨嬬被
銆銆


銆銆浣跨敤Eclipse鎺ュ彛鍚戝鍒涘緩娉涘瀷鎺ュ彛
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銆銆鍥?.2 浣跨敤鎺ュ彛鍚戝鍒涘緩娉涘瀷鎺ュ彛
銆銆


銆銆2.4 娉涘瀷鏂規硶
銆銆
銆銆綾誨瀷鍙傛暟(type parameter)涓嶄粎浠呭彲浠ョ敤鏉ュ0鏄庢硾鍨嬬被鎴栬呮硾鍨嬫帴鍙? 涔熷彲浠ョ敤鏉ュ0鏄庢硾鍨嬫柟娉? 鑰屼笖榪欑澹版槑鐨勬硾鍨嬫柟娉曞彲浠ョ敤鍦ㄩ潪娉涘瀷綾諱腑, 澹版槑娉涘瀷鏂規硶鐨勪竴鑸牸寮忔槸
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銆銆娓呭崟2.5 娉涘瀷鏂規硶鐨勪竴鑸艦寮?BR>銆銆
銆銆<type-list> return-type method-name(parameter-list) {}
銆銆
銆銆娓呭崟3.2.6 娉涘瀷鏂規硶紺轟緥
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銆銆public <T> String getString(T obj) {
銆銆return obj.toString();
銆銆}
銆銆
銆銆2.5 鍙楅檺娉涘瀷
銆銆
銆銆鍙楅檺娉涘瀷鏄寚綾誨瀷鍙傛暟鐨勫彇鍊艱寖鍥存槸鍙楀埌闄愬埗鐨? extends鍏抽敭瀛椾笉浠呬粎鍙互鐢ㄦ潵澹版槑綾葷殑緇ф壙鍏崇郴, 涔熷彲浠ョ敤鏉ュ0鏄庣被鍨嬪弬鏁?type parameter)鐨勫彈闄愬叧緋?渚嬪, 鎴戜滑鍙渶瑕佷竴涓瓨鏀炬暟瀛楃殑鍒楄〃, 鍖呮嫭鏁存暟(Long, Integer, Short), 瀹炴暟(Double, Float), 涓嶈兘鐢ㄦ潵瀛樻斁鍏朵粬綾誨瀷, 渚嬪瀛楃涓?String), 涔熷氨鏄, 瑕佹妸綾誨瀷鍙傛暟T鐨勫彇鍊兼硾鍨嬮檺鍒跺湪Number鏋佸叾瀛愮被涓?鍦ㄨ繖縐嶆儏鍐典笅, 鎴戜滑灝卞彲浠ヤ嬌鐢╡xtends鍏抽敭瀛楁妸綾誨瀷鍙傛暟(type parameter)闄愬埗涓烘暟瀛?
銆銆
銆銆娓呭崟2.7 鍙楅檺娉涘瀷紺轟緥
銆銆public class Limited<T extends Number> {
銆銆public static void main(String[] args) {
銆銆Limited<Integer> number;銆 //姝g‘
銆銆Limited<String> str;銆銆銆 //緙栬瘧閿欒
銆銆}
銆銆}
銆銆
銆銆鍦‥clipse 3.1涓? 涓婁緥涓殑緙栬瘧閿欒淇℃伅濡備笅鍥炬墍紺?BR>銆銆
銆銆鍥?.3 鐢變簬鍙楅檺娉涘瀷瀵艱嚧鐨勭紪璇戦敊璇?BR>銆銆


銆銆鍦ㄧ▼搴忎腑浣跨敤娉涘瀷
銆銆
銆銆3.1鍦ㄧ▼搴忎腑浣跨敤娉涘瀷綾?BR>銆銆
銆銆鍦ㄥ垱寤烘硾鍨嬬被鐨勫璞$殑鏃跺? 鍜屽垱寤烘櫘閫氬璞″熀鏈被浼? 蹇呴』鎻愪緵鍏蜂綋鐨勭被綾誨瀷鏉ユ浛浠g被鍨嬪弬鏁癟 (J2SE 5.0鐩墠涓嶆敮鎸佸師濮嬬被鍨嬩綔涓虹被鍨嬪弬鏁?type parameter)).
銆銆
銆銆娓呭崟3.1, 浣跨敤娉涘瀷綾?BR>銆銆
銆銆//濡傛灉闇瑕佹暣鍨嬬殑鍒楄〃
銆銆GenList<Integer> integerList = new GenList<Integer>();
銆銆//濡傛灉闇瑕佸瓧絎﹀瀷鐨勫垪琛?BR>銆銆GenList<String> strList = new GenList<String>();
銆銆//涓嶈兘浣跨敤鍘熷綾誨瀷
銆銆GenList<int> nList = new GenList<int>();銆//緙栬瘧閿欒
銆銆
銆銆3.2 浣跨敤娉涘瀷瑙e喅綾誨瀷瀹夊叏鎬ч棶棰?BR>銆銆
銆銆浣跨敤娉涘瀷瀹炵幇鐨勫垪琛ㄦ槸綾誨瀷瀹夊叏鐨? 涓嬪垪鐮村潖綾誨瀷瀹夊叏璇彞浼氬湪緙栬瘧鐨勬椂鍊欐鏌ュ嚭鏉ャ?鎶婇紶鏍囨斁鍦ㄩ敊璇爣璁頒笂錛?Eclipse 3.1涓殑閿欒鎻愮ず灝變細鏄劇ず錛屽涓嬪浘鎵紺猴細
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銆銆鍥?.3.2 鐮村潖綾誨瀷瀹夊叏寮曡搗鐨勯敊璇?BR>銆銆


銆銆3.3 浜屼箟鎬ч敊璇?BR>銆銆
銆銆GenMap鍦ㄥ0鏄庢槸浣跨敤浜?涓被鍨嬪弬鏁癟鍜孷, 鍥犳鍦ㄥ垱寤篏enMap鐨勫璞$殑鏃跺欎篃闇瑕佹彁渚?涓叿浣撶殑綾葷被鍨嬫潵鏇夸唬榪?涓被鍨嬪弬鏁? 渚嬪,
銆銆
銆銆娓呭崟9, 澶氫釜鍙傛暟鐨勬硾鍨嬬被
銆銆
銆銆GenMap<Integer, String> gm = new GenMap<Integer, String>();
銆銆GenMap<String, String> gm2 = new GenMap<String, String>();
銆銆
銆銆涓婁緥涓? T鍜孷铏界劧鐪嬭搗鏉ユ槸涓や釜涓嶅悓鐨勭被鍨嬪弬鏁? 浣嗘槸鍦ㄤ嬌鐢ㄨ繖涓硾鍨嬬被鐨勬椂鍊? T鍜孷寰堟湁鍙兘琚浛鎹㈡垚鍚屼竴縐嶇被鍨? 鍥犳鍦ㄥ0鏄庡涓被鍨嬪弬鏁扮殑娉涘瀷綾繪椂, 瑕佹敞鎰忛伩鍏嶈繖縐嶄簩涔夋ч敊璇? 渚嬪,
銆銆
銆銆娓呭崟10, 浜屼箟鎬ч敊璇?BR>銆銆
銆銆public class GenMap<T, V> {
銆銆//緙栬瘧閿欒, 浜屼箟鎬ч敊璇?BR>銆銆public void set(T t){}
銆銆public void set(V v){}
銆銆}
銆銆
銆銆鍦ㄤ笂闈㈣繖孌典唬鐮? 濡傛灉T鍜孷琚浛鎹㈡垚鍚屼竴縐嶇被鍨? set鍑芥暟鐨勭鍚?signature)灝辨槸瀹屽叏涓鏍風殑, 鎵浠ョ紪璇戝櫒浼氭姤鍛婁簩涔夋ч敊璇? 姝g‘鐨勭敤娉曟槸澹版槑2涓笉鍚屽悕鐨勬柟娉? 渚嬪,
銆銆
銆銆娓呭崟10, 浜屼箟鎬ч敊璇?BR>銆銆
銆銆public class GenMap<T, V> {
銆銆public void setKey(T t){}
銆銆public void setValue(V v){}
銆銆}
銆銆
銆銆鍥?.3 浜屼箟鎬ч敊璇?BR>銆銆


銆銆3.4 浣跨敤閫氶厤絎?BR>銆銆
銆銆鍓嶉潰鎴戜滑鍒涘緩浜嗘硾鍨嬬殑鍒楄〃, 濡傛灉鎴戦渶瑕佷竴涓柟娉曟潵澶勭悊娉涘瀷鍒楄〃, 渚嬪, 鎴戜滑甯屾湜鎶婂垪琛ㄤ腑鐨勬瘡涓厓绱犻兘鎵撳嵃鍑烘潵, 浣嗘槸綾誨瀷鍙傛暟(type parameter)鍙兘浣跨敤鍦ㄥ0鏄庝竴涓硾鍨嬬被鐨勬椂鍊? 濡傛灉綾誨瀷鍙傛暟浣跨敤鍦ㄥ嚱鏁板畾涔夐噷浼氬鑷寸紪璇戦敊璇?BR>銆銆
銆銆public static void print(GenList<T> list){} //緙栬瘧閿欒
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銆銆鍦ㄨ繖縐嶆儏鍐典笅, 鎴戜滑闇瑕佺敤鍙﹀涓縐嶆柟娉曟潵琛ㄧず涓涓硾鍨嬬被, 鍚﹀垯, 灝卞彲鑳介渶瑕佷功鍐欏涓猵rint鍑芥暟銆?BR>銆銆
銆銆public static void print(GenList<Integer> list){}
銆銆public static void print(GenList<Double> list){}
銆銆鈥?BR>銆銆public static void print(GenList<String> list){}
銆銆
銆銆J2SE 5.0涓彁渚涗簡娉涘瀷鐨勯氶厤絎??", "?"鍙互鐢ㄦ潵浠f浛浠諱綍綾誨瀷, 渚嬪浣跨敤閫氶厤絎︽潵瀹炵幇print鏂規硶銆?BR>銆銆
銆銆public static void print(GenList<?> list) {}
銆銆
銆銆娉涘瀷鐨勪竴浜涘眬闄愬瀷
銆銆
銆銆(1) 綾誨瀷鍙傛暟涓嶈兘瀹炰緥鍖? 渚嬪,
銆銆
銆銆T t= new T();銆 //緙栬瘧閿欒
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銆銆(2) 涓嶈兘瀹炰緥鍖栫被鍨嬪弬鏁扮殑鏁扮粍
銆銆
銆銆T[] ts= new T[10];銆 //緙栬瘧閿欒
銆銆
銆銆(3) 綾葷殑闈欐佸彉閲忎笉鑳藉0鏄庝負綾誨瀷鍙傛暟綾誨瀷
銆銆
銆銆public



灝廝 2005-11-30 11:36 鍙戣〃璇勮
]]>
鍒嗛〉婧愮爜http://www.tkk7.com/xpsir/articles/7703.html灝廝灝廝Thu, 14 Jul 2005 08:49:00 GMThttp://www.tkk7.com/xpsir/articles/7703.htmlhttp://www.tkk7.com/xpsir/comments/7703.htmlhttp://www.tkk7.com/xpsir/articles/7703.html#Feedback0http://www.tkk7.com/xpsir/comments/commentRss/7703.htmlhttp://www.tkk7.com/xpsir/services/trackbacks/7703.html涓銆佸垎欏墊帴鍙o細
/*
 * Page.java
 * 鍒涘緩鏃ユ湡 2005-4-13
 * @ Author wuxp
 */
package org.page.pageutil;

/**
 * @ Author wuxp
 */
public interface Page {
 public void setCurrentPage(String c);
 public int getCurrentPage();
 public String getToolBar(String path);
 
 public int count(String sql);
 public int getMaxPage();

}
浜屻佹煡璇㈢被
/*
 * Query.java
 * 鍒涘緩鏃ユ湡 2005-4-13
 * @ Author wuxp
 */
package org.page.pageutil;


/**
 * @ Author wuxp
 */
public class Query {
 String sql="";
 int max=10;
 public Query(String sql1) 
 {
  sql="select * from (select table1.*,rownum as row1 from ("+sql1+") table1) ";
 }
 
 public String getQuerySql(){
  return sql;
 }
 
 public void setFirstPage(int first)
 {
  sql+="where row1>"+(first*max);
  if (first==0)
   sql+=" and row1<="+max;
  else
   sql+=" and row1<="+(first*max+max);
  //System.out.println(sql);
 }
 
 public void setMaxResults(int max)
 {
  this.max=max;
 }
}
涓夈佸垎欏墊帴鍙e疄鐜幫細
/*
 * SimplePage.java
 * 鍒涘緩鏃ユ湡 2005-4-13
 * @ Author wuxp
 */
package org.genius.util.page.pageutil;

import java.sql.ResultSet;

import org.genius.systemmanager.database.JndiConn;

/**
 * @ Author wuxp
 */
public class SimplePage implements Page {
 public int currentPage=0;
 private int all;
 private int maxPage;
 private int maxResults;
 public void setCurrentPage(String c)
 {
  if (c!=null)
   currentPage=Integer.parseInt(c);
 }
 
 public void setMaxPage(int maxPage) {
  this.maxPage = maxPage;
 }
 
 public int getMaxPage() {
  return maxPage;
 }
 public int getCurrentPage()
 {
  return currentPage;
 }
 public String getToolBar(String path)
 {
  String toolbar="<table border=0 width=95% height=25><form action='"+path+"' method='post' onsubmit='checkJump(this)'><tr><td align=right>";
  toolbar+="鍏?lt;font color='#21A2E7'>"+maxResults+"</font>鏉?";
  toolbar+="<a href='"+path+"&currentPage=0'>棣栭〉</a> | ";
  if (currentPage==0)
   toolbar+="涓婇〉 | ";
  else
   toolbar+="<a href='"+path+"&currentPage="+(currentPage-1)+"'>涓婇〉</a> | ";
  if (currentPage==all)
   toolbar+="涓嬮〉 | ";
  else
   toolbar+="<a href='"+path+"&currentPage="+(currentPage+1)+"'>涓嬮〉</a> | ";
  toolbar+="<a href='"+path+"&currentPage="+all+"'>灝鵑〉</a> ";
  toolbar+=" 欏墊錛?lt;font color='#21A2E7'>"+(currentPage+1)+"/"+(all+1)+"</font>欏?";
  toolbar+="<font color='#21A2E7'>"+maxPage+"</font>鏉?欏?";
  toolbar+=" 杞埌絎?lt;input type=\"text\" name=\"currentPage\" style=\"width:15;height:18\">欏?";
  toolbar+="<input type='submit' value='GO' class='toolbar_go'>";
  toolbar+="<script>function checkJump(form1){" +
    "if (form1.currentPage.value==\"\"||isNaN(form1.currentPage.value)||form1.currentPage.value>"+(all+1)+"||form1.currentPage.value<0){" +
    "form1.currentPage.value='0';}" +
    "else{" +
    "form1.currentPage.value=parseInt(parseInt(form1.currentPage.value)-1);" +
    "}";
  toolbar+="}</script>";
  toolbar+="</td></form></tr></table>";
  return toolbar;
 }
 public int count(String sql){

   //姝ょ被鏄嚜宸卞皝瑁呯殑榪炵粨姹狅紝鍙敼鍙樹負鑷繁鐨勬暟鎹簱榪炴帴
  JndiConn conn=new JndiConn();
  String sql_count="select count(*) as count from ("+sql+")";
  //System.out.println(sql);
  try{
   ResultSet rs=conn.executeQuery(sql_count);
   while (rs.next())
    all=rs.getInt("count");
   rs.close();
  }
  catch(Exception e){
   e.printStackTrace();
  }finally{
   conn.close();
  }
  maxResults=all;
  if (all%maxPage==0){
   if (all<=maxPage)
   all=0;
   else
    all=all/maxPage-1;
  }
  else
   all=all/maxPage;
  //all=all/maxPage;
  return all;
 }

}




灝廝 2005-07-14 16:49 鍙戣〃璇勮
]]>
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