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package org.sp.singleton;
//·½·¨Ò»
public class Singleton {
//½«×ÔÉíµÄʵÀý¶ÔÏóÉèÖÃΪһ¸öÊôÐÔ,²¢¼ÓÉÏStaticºÍfinalÐÞÊηû
private static final Singleton instance = new Singleton();
//½«¹¹Ôì·½·¨ÉèÖóÉ˽ÓÐÐÎʽ
private Singleton() {
}
//ͨ¹ýÒ»¸ö¾²Ì¬·½·¨ÏòÍâ½çÌṩÕâ¸öÀàµÄʵÀý
public static Singleton getInstance() {
   return instance;
}
}
//·½·¨¶þ
class Singleton2 {
private static Singleton2 instance2 = null;
public static synchronized Singleton2 getInstance() {
   if (instance2 == null)
    instance2 = new Singleton2();
   return instance2;
}
}
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2.¹¤³§Ä£Ê½
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public class Factory{
public ClassesDao getClassesDao(){
   ClassesDao cd = new ClassesDaoImpl();
   return cd;
}
}
interface ClassesDao{
public String getClassesName();
}
class ClassesDaoImpl implements ClassesDao {
public String getClassesName(){
   System.out.println("A°à");
}
}
class test
{
public static void main(String[] args){
   Factory f = new Factory();
   f.getClassesDao().getClassesName();
}
}
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interface ClassesDao{
public String getClassesName();
}
class ClassesDaoImpl implements Classe


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