Singleton Creation

[Natesan Prabhakaran]

Hi,

Can any one tell me how to create a singleton without private constructor.Thanks.

-prabhakaran

[Rob Spoor]

Without a non-accessible constructor you cannot guarantee that it is a singleton. If other code can call the constructor, it can create multiple objects and there will be no more singleton.

[Jelle Klap]

I guess that would depend on your definition of "singleton".
If you defer object creation to some mechnism external to the "singleton" class, you could let that mechanism cache the first instance it creates and have it return that instance upon consecutive calls. Which is kind of how Spring handles "singleton" beans. Ofcourse this definition of a "singleton" is radically different from the traditional design pattern, and ouside the scope of such a mechanism the bean could not be considered a "singleton" at all.
[ June 05, 2008: Message edited by: Jelle Klap ]

[Natesan Prabhakaran]

Why not we use anonymous class to create singleton, by default its private constructor. I dont know please tell me.

[Santhi Bharath]

can you please tell me what is singleton?

[Campbell Ritchie]

Start with this FAQ about the Singleton Pattern.

[Ilja Preuss]

Originally posted by Natesan Prabhakaran:
Why not we use anonymous class to create singleton, by default its private constructor. I dont know please tell me.

I don't understand the question. Perhaps you can show us some code?