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import java.util.HashMap;
public class RegSingleton
{
static private HashMap m_registry = new HashMap();
private List<Player> plsyers=new linkedList<Player>();
static
{
RegSingleton x = new RegSingleton();
m_registry.put( x.getClass().getName() £¬ x);
}
/**
* ±£»¤µÄĬÈϹ¹Ôì×Ó
*/
protected RegSingleton() {}
/**
* ¾²Ì¬¹¤³§·½·¨£¬·µ»¹´ËÀàΩһµÄʵÀý
*/
static public RegSingleton getInstance(String name)
{
if (name == null)
{
name = "com.javapatterns.singleton.demos.RegSingleton";
}
if (m_registry.get(name) == null)
{
try
{
m_registry.put( name£¬
Class.forName(name).newInstance() ) ;
}
catch(Exception e)
{
System.out.println("Error happened.");
}
}
return (RegSingleton) (m_registry.get(name) );
}
public void remove(Player player){
     players.remove(Player);
}
public List<Player> getPlayers(){
   return players;
}
}
ËüµÄ×ÓÀàRegSingletonChild ÐèÒª¸¸ÀàµÄ°ïÖú²ÅÄÜʵÀý»¯¡£ÏÂͼËùʾÊǵǼÇʽµ¥ÀýÀà×ÓÀàµÄÒ»¸öÀý×Ó¡£Í¼ÖеĹØÏµ±íÃ÷£¬´ËÀàÊÇÓɸ¸Àཫ×ÓÀàʵÀý»¯µÄ¡£
ÏÂÃæÊÇ×ÓÀàµÄÔ´´úÂë¡£
´úÂëÇåµ¥4£ºµÇ¼Çʽµ¥ÀýÀàµÄ×ÓÀà
import java.util.HashMap;
public class RegSingletonChild extends RegSingleton
{
public RegSingletonChild() {}
/**
* ¾²Ì¬¹¤³§·½·¨
*/
static public RegSingletonChild getInstance()
{
return (RegSingletonChild)
RegSingleton.getInstance(
"com.javapatterns.singleton.demos.RegSingletonChild" );
}
public void test(){
     int a= getPlayers().size();
     int b =RegSingleton .getInstance().getPlayers().size();
}
}
ÔÚGoF ԭʼµÄÀý×ÓÖУ¬²¢Ã»ÓÐgetInstance() ·½·¨£¬ÕâÑùµÃµ½×ÓÀà±ØÐëµ÷ÓõÄgetInstance(String name)·½·¨


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