public static void main(String[] args){
CommandLoader cl=new DefaultCommandLoader(new DefaultShowCommand());
cl.excute("executeShowList",null);
}
}
public interface CommandLoader {
void excute(String commandName,Object[] argument);
}
public class DefaultCommandLoader implements CommandLoader {
private ShowCommand showCommand;
private HashMap subCommandMap=new HashMap();
public DefaultCommandLoader(ShowCommand showCommand){
this.showCommand=showCommand;
init();
}
private void init() {
Method[] allMethod=this.showCommand.getClass().getMethods();
for(int i=0;i<allMethod.length;i++){
Method m=allMethod;
if(m.getName().startsWith("execute")){
subCommandMap.put(m.getName(), m);
}
}
}
public void excute(String commandName, Object[] argument) {
Method m=(Method) this.subCommandMap.get(commandName);
if(m==null){
throw new NullPointerException("not found command");
}
try{
m.invoke(this.showCommand,argument);
}
catch(Exception e){
throw new RuntimeException("Load command["+m.getName()+"error");
}
}
}
public interface ShowCommand {
public void executeShowList();
public void excuteShowString();
public void executeShowInteger();
public void executeShowLong();
}
public class DefaultShowCommand implements ShowCommand {
public void excuteShowString() {
System.out.println(String.class.getName());
}
public void executeShowInteger() {
System.out.println(Integer.class.getName());
}
public void executeShowList() {
System.out.println(List.class.getName());
}
public void executeShowLong() {
System.out.println(Long.class.getName());
}
}
]]>
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璁捐妯″紡鐨勫垏鍏ュ彛
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銆銆絎竴. 榪欎釜甯栧瓙涓婦渚嬬殑絎竴涓唬鐮佹渚嬫槸娌℃湁涓婁笅鏂囩殑錛屾枃涓彧璇存槑鏈変竴孌典唬鐮侊細
| main() {
if錛坈ase A錛墈 //do with strategy A }else(case B){ //do with strategy B }else(case C){ //do with strategy C } } | 聽 |
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if else鏇夸唬鑰?/strong>
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銆銆浣跨敤浼犵粺璇█鎬濈淮鐨勬儏鍐佃繕鏈夛細浣跨敤涓涓被鏁存暟鍙橀噺鏍囪瘑鐘舵侊細
聽 public class Order{ private int status; //璇存槑錛? //status=1 琛ㄧず璁㈣揣浣嗕負鏌ョ湅 錛?/p> //status=2 琛ㄧず宸茬粡鏌ョ湅鏈鐞嗭紱 //status=3 琛ㄧず宸茬粡澶勭悊鏈粯嬈?/p> //status=4 琛ㄧず宸茬粡浠樻鏈彂璐?/p> //status=5 琛ㄧず宸茬粡鍙戣揣 } |
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銆銆浠ｇ悊瀵硅薄鍙互鏄鍚堟煇縐嶆潯浠剁殑浠ｈ〃鑰咃紝姣斿錛屾潈闄愭楠岋紝浼犵粺闈㈠悜榪囩▼鎬濈淮鏄細褰撲竴涓敤鎴風櫥闄嗗悗錛岃闂煇璧勬簮鏃訛紝浣跨敤if else榪涜鍒ゆ柇錛屽彧鏈夋煇縐嶆潯浠剁鍚堟椂錛屾墠鑳藉厑璁歌闂紝榪欐牱鏉冮檺鍒ゆ柇鍜屼笟鍔℃暟鎹昏緫娣蜂貢鍦ㄤ竴璧鳳紝浣跨敤浠ｇ悊妯″紡鍙互娓呮櫚鍒嗙錛屽鏋滃珜涓嶅お濂斤紝浣跨敤鍔ㄦ佷唬鐞嗭紝鎴栬呬笅闈OP絳夋柟寮忋?br />
銆銆
銆銆鍏跺疄浣跨敤filter榪囨護鍣ㄤ篃鍙互鏇夸唬鎴戜滑涓氬姟涓殑if else錛岃繃婊ゅ櫒璧峰埌涓縐嶈繃婊ゅ拰絳涢変綔鐢紝灝嗙鍚堟湰榪囨護鍣ㄦ潯浠剁殑瀵硅薄鎷︽埅涓嬫潵鍋氭煇浠朵簨鎯咃紝榪欏氨鏄竴涓繃婊ゅ櫒鐨勫姛鑳斤紝澶氫釜榪囨護鍣ㄧ粍鍚堝湪涓璧峰疄闄呭氨鏄痠f else鐨勭粍鍚堛?br />銆銆鎵浠ワ紝濡傛灉浣犲疄鍦ㄦ兂涓嶅嚭浠涔堝姙娉曪紝鍙互浣跨敤榪囨護鍣紝灝嗚繃婊ゅ櫒鐪嬫垚闃茬伀澧欏氨姣旇緝濂界悊瑙ｏ紝褰撳鎴風鏈変竴涓姹傛椂錛岀粡榪囦笉鍚屾ц川鐨勯槻鐏錛岃繖涓槻鐏鏄嫤鎴鍙ｇ殑錛涢偅涓槻鐏鏄畨鍏ㄦ鏌ユ嫤鎴瓑絳夈傝繃婊ゅ櫒涔熷鍚岀孩钃濈櫧鍚勭鍏夋護闀滐紱綰㈣壊婊ら暅鍙兘灝嗛氳繃鍏夌嚎涓殑綰㈣壊鎷︽埅浜嗭紱钃濊壊婊ら暅灝嗗厜綰夸腑鐨勮摑鑹叉嫤鎴笅鏉ワ紝榪欏疄闄呬笂鏄鍏夌嚎浣跨敤if else榪涜鍒嗚В銆?br />
銆銆濡傚浘錛岄氳繃涓涓釜鏉′歡榪囨護鍣ㄦ垜浠珛浣撳湴瀹炵幇浜嗗淇″彿鐨勫垎紱伙紝濡傛灉浣犱嬌鐢╥f else錛岃鏄庝綘鏄皢鍥句腑鐨勬潯浠?/2/3/4鍚堝茍鍦ㄤ竴璧鳳紝鍦ㄥ悓涓涓湴鏂瑰疄鐜版潯浠跺垽鏂?br />銆銆闇瑕佹繁鍏ヤ簡瑙ｈ繃婊ゅ櫒鐨勫疄鐜扮粏鑺傚拰寰皬鍖哄埆錛岃鍙傝冩枃绔狅細AOP vs Decorator
OO璁捐鐨勬葷粨銆銆
銆銆榪樻湁涓縐嶄吉妯″紡錛岃櫧鐒朵嬌鐢ㄤ簡鐘舵佺瓑妯″紡錛屼絾鏄湪妯″紡鍐呴儴瀹炶川榪樻槸浣跨敤if else鎴杝witch榪涜鐘舵佸垏鎹㈡垨閲嶈鏉′歡鍒ゆ柇錛岄偅涔堟棤鐤戣鏄庤繕闇瑕佽繘涓姝ュ姫鍔涖傛洿閲嶈鐨勬槸錛屼笉鑳戒互妯″紡鑷眳錛岃屼笖鍑轟功紺轟漢銆?/p>
銆銆鐪熸鎺屾彙闈㈠悜瀵硅薄榪欎簺鎬濇兂鏄竴浠跺洶闅劇殑浜嬫儏錛岀洰鍓嶆湁鍚勭灞炰簬鎻潃鑷繁澶村彂鍚戜笂鎷旂殑瑙ｈ錛岄兘鏄浜哄瓙寮熺殑錛屾墍浠ユ垜瑙夊緱鍒濆鑰呰Thinking in Java錛圝ava緙栫▼鎬濇兂錛夋槸娌℃湁鐢紝瀹冭瘯鍥句粠璇█灞傛鏉ヨOO緙栫▼鎬濇兂錛岄潪甯稿け璐ワ紝浣滀負璇█鍙傝冧功鍙互錛屼絾鏄綔涓篔ava浣撶幇鐨凮O鎬濇兂鐨勫涔犺祫鏂欙紝灝遍敊浜嗐?/p>
銆銆OO緙栫▼鎬濇兂鏄竴縐嶆柟娉曡錛屾柟娉曡濡傛灉娌℃湁搴旂敤姣旇緝錛屾槸鏃犳硶浣撲細榪欎釜鏂規硶璁虹殑鐗圭偣鐨勶紝紱呮槸鍙や唬涓涓柟娉曡錛屾偀紱呮槸闈犳寫姘寸爫鏌磋繖浜涘簲鐢ㄦ墠鑳戒綋浼氥?/p>
銆銆閭ｄ箞OO鎬濇兂闈犱粈涔堝簲鐢ㄨ兘澶熶綋浼氬埌浜嗭紵鏄疓oF璁捐妯″紡錛孏oF璁捐妯″紡鏄瓑浜庤蔣浠朵漢鍛樼殑鎸戞按鐮嶆煷絳夊熀鏈椿錛屾墍浠ワ紝濡傛灉涓涓▼搴忓憳榪炲熀鏈椿閮戒笉浼氾紝浠栦綍浠ヨ嚜灞匫O紼嬪簭鍛橈紵浠庝簨OO涓撲笟璁捐緙栫▼榪欎釜宸ヤ綔錛屽鏋滀笉鎺屾彙璁捐妯″紡鍩烘湰鍔燂紝灝辮薄涓涓仛鍜屽皻鐨勪漢涓嶆効鎰忔寫姘寸爫鏌達紝浠栦綍浠ョ珛瓚寵繖涓涓氾紵鏃╁氨琚笀鍌呰刀涓嬪北銆?/p>
銆銆鏈鍚庢葷粨錛氬皢if else鐢ㄥ湪灝忓湴鏂硅繕鍙互錛屽綆鍗曠殑鏁板煎垽鏂紱浣嗘槸濡傛灉鎸夌収浣犵殑浼犵粺涔犳儻鎬濈淮錛屽湪瀹炵幇涓氬姟鍔熻兘鏃朵篃浣跨敤if else錛岄偅涔堣鏄庝綘鐨勬濈淮鍙兘闇瑕侀噸濉戯紝浣犵殑緙栫▼緇忛獙瓚婁赴瀵岋紝浼犵粺榪囩▼鎬濈淮妯″紡灝卞鏄撴牴娣辮拏鍥猴紝鎯抽潬鑷繁鏀瑰彉寰堝洶闅撅紱寤鴻鎺ュ彈涓撲笟澶磋剳椋庢毚鍩硅銆?/p>
銆銆鐢ㄤ竴鍙ヨ瘽鎬葷粨錛氬鏋滀綘鍋氫簡涓嶅皯緋葷粺錛屽緢涔呮病鏈変嬌鐢╥f else浜嗭紝閭ｄ箞璇存槑浣犲彲鑳界湡姝ｈ繘鍏O璁捐鐨勫鍦頒簡銆傦紙榪欐槸鏈漢鑷繁鍙戞槑鐨勫疄鎴樻х殑琛￠噺鑰冩牳鏍囧噯錛夈?/p>
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http://dev.mysql.com/doc/refman/5.1/en/connector-j-reference-replication-connection.html
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聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 2007.8.24
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