java flyweightģʽ
Flyweight ¶¨Òå:
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´ó,±ÈÈç,×Ö´¦ÀíÈí¼þ,Èç¹ûÒÔÿ¸öÎÄ×Ö¶¼×÷Ϊһ¸ö¶ÔÏó,¼¸Ç§¸ö×Ö,¶ÔÏóÊý¾ÍÊǼ¸Ç§,ÎÞÒɺÄ
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¹²ÏíµÄÀà,ÁíÍâ,»¹ÓÐÒ»Ð©ÌØÐÔÊÇÈ¡¾öÓÚÓ¦ÓÃ(context),ÊDz»¿É¹²ÏíµÄ,ÕâÒ² Flyweight ÖÐÁ½
¸öÖØÒª¸ÅÄîÄÚ²¿×´Ì¬ intrinsic ºÍÍⲿ״̬ extrinsic Ö®·Ö.
Õâ¸öÊǶÔÕâ¸öģʽµÄ¶¨Ò壬ÎÒ¾õµÃ×îÖØÒªµÄÊÇÄܹ»¶ÔÒª´¦Àí¶ÔÏó½øÐÐÄÚ²¿×´Ì¬ºÍÍⲿ״̬µÄÇø·Ö£¬ÕâÑù¶ÔÏóµÄÄÚ²¿×´Ì¬¾ÍÄܹ²Ïí£¬µ«ÊǺܶàÀý×Ó¶¼°Ñflyweightģʽд³ÉÒ»pool£¬È»ºó¶ÔpoolÀïµÄ¶ÔÏó½øÐй²Ïí£¬ÕâÑùÃ²ËÆÆ«ÀëÁËflyweightģʽµÄ³õÖÔ¶øÇÒЧ¹û²»ÀíÏë¡£ÏÂÃæÊÇÍøÉÏÕÒµ½µÄÀý×Ó£¬±È½Ï·ûºÏģʽµÄÒâͼ
1.¶¨Òå³éÏó½Ó¿Ú
public interface Font {
public void SetFont(String color, int size);
public void GetFont();
}
2.½Ó¿ÚµÄ¾ßÌåʵÏÖ
public class ConcreteFont implements Font {
private String color;
private int size;
private String str;
public ConcreteFont(String s) {
str = s;
// id = "The char is: " + s;
}
public void SetFont(String _color, int _size) {
color = _color;
size = _size;
}
public void GetFont() {
System.out.println("String :" + str + "--- color is:" + color
+ "--- size is:" + size);
}
}
3.Flyweight factory ¸ºÔðά»¤Ò»¸ö Flyweight ³Ø(´æ·ÅÄÚ²¿×´Ì¬)
public class FontFactory {
private Hashtable<String, Font> charHashTable = new Hashtable();
public FontFactory() {
}
public Font GetFlyWeight(String s) {
if (charHashTable.get(s) != null) {
return (Font) charHashTable.get(s);
} else {
Font tmp = new ConcreteFont(s);
charHashTable.put(s, tmp);
return tmp;
}
}
public Hashtable GetFactory() {
return charHashTable;
}
}
²âÊÔ£º
public class Main {
public static void main(String[] args) {
int[] size = { 8, 9, 10, 11, 12 };
String[] color = { "FFFFFF", "000000", "FF00FF", "CCCCCC", "111111" };
FontFactory myFontFactory = new FontFactory(
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detachedCriteria.add(Restrictions.or(
Restrictions.like("chengBanDanWeiIds", rForm.getChengBanDanWeiIds()+(char)13, MatchMode.START),
Restrictions.or(
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HttpClient httpClient = new HttpClient();
HttpClientParams clientPar ......