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java flyweightģʽ

Flyweight ¶¨Òå:
±ÜÃâ´óÁ¿ÓµÓÐÏàͬÄÚÈݵÄСÀàµÄ¿ªÏú(ÈçºÄ·ÑÄÚ´æ),ʹ´ó¼Ò¹²ÏíÒ»¸öÀà(ÔªÀà).
ÃæÏò¶ÔÏóÓïÑÔµÄÔ­Ôò¾ÍÊÇÒ»Çж¼ÊǶÔÏó,µ«ÊÇÈç¹ûÕæÕýʹÓÃÆðÀ´,ÓÐʱ¶ÔÏóÊý¿ÉÄÜÏԵúÜÅÓ
´ó,±ÈÈç,×Ö´¦ÀíÈí¼þ,Èç¹ûÒÔÿ¸öÎÄ×Ö¶¼×÷Ϊһ¸ö¶ÔÏó,¼¸Ç§¸ö×Ö,¶ÔÏóÊý¾ÍÊǼ¸Ç§,ÎÞÒɺÄ
·ÑÄÚ´æ,ÄÇôÎÒÃÇ»¹ÊÇÒª"Çóͬ´æÒì",ÕÒ³öÕâЩ¶ÔÏóȺµÄ¹²Í¬µã,Éè¼ÆÒ»¸öÔªÀà,·â×°¿ÉÒÔ±»
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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javaÓÃĬÈÏÓ¦ÓóÌÐò´ò¿ª¹ØÁªµÄÎļþ

import java.awt.Desktop;
import java.io.File;
import java.io.IOException;
public class TestDesktop {
public static void main(String[] a) {
try {
Desktop desktop = null;
if (Desktop.isDesktopSupported()) {
desktop = Desktop.getDesktop();
}
desktop.open(new File("/hom ......

java´òÓ¡µÄÔ´´úÂë(ʾÀý)

package com.demo;
import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.print.*;
import java.util.*;
import javax.print.*;
import javax.print.attribute.*;
import javax.swing.*;
/**
This program demonstrates how to print 2D graphics ......

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