Singleton Pattern

1.懒汉单态模式

public class LazySingleton{

private static LazySingleton lazySingleton;

private LazySingleton(){...}

public synchronized static LazySingleton getInsatance(){

   if(lazySingleton==null){

     lazySingleton = new LazySingleton();

  }

   return lazySingleton;

}

}

 

2.饿汉单态模式

public class ESingleton{

private final static ESingleton eSingleton;

private ESingleton(){}

public static getInstance(){return eSingleton;}

}

 

3.登记式单例