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Singleton.java£º
package com.xfimti.sigleton;
public class Singleton
{
/*µÚÒ»ÖÖ·½Ê½¡£*/
private static Singleton singleton = new Singleton();
/*µÚ¶þÖÖ·½Ê½¡£*/
private static Singleton mySingleton = null;
private Singleton()
{
}
/*µÚÒ»ÖÖ·½Ê½¡£*/
public static Singleton getSingletonInstance()
{
return singleton;
}
/*µÚ¶þÖÖ·½Ê½¡£*/
public static Singleton getInstance()
{
if(mySingleton == null)
{
mySingleton = new Singleton();
}
return singleton;
}
}
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Dao.java
package com.xfimti.factory;
public interface Dao
{
public void save();
}
DaoImpl4Mysql.java
package com.xfimti.factory;
public class DaoImpl4Mysql implements Dao
{
public void save()
{
System.out.println("save for dao...");
}
}
(¾²Ì¬¹¤³§)StaticFactory.java
package com.xfimti.factory;
/**¾²Ì¬¹¤³§»ò¼òµ¥¹¤³§*/
public class StaticFactory
{
public static Dao getDao(String type)
{
if(type.equals("mysql"))
{
return new DaoImpl4Mysql();
}
return null;
}
}
²âÊÔÀࣺMain.java
package com.xfimti.factory;
public class Main
{
public static void main(String[] args)
{
/*ʹÓþ²Ì¬¹¤³§ ¡£*/
// Dao dao = StaticFactory.getDao("mysql");
// dao.save();
Dao dao = new DaoFactoryMethod().getDao("mysql");
dao.save();
}
}
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DaoFactoryMethod.java
package com.xfimti.factory;
/*ʵÀý¹¤³§·½·¨¡£*/
public class DaoFactoryMethod
{
public Dao getDao(String type)
{
if(type.equals("mysql"))
{
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