aspose file tools*
The moose likes Java in General and the fly likes implement singleton pattern on reflected class Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Java in General
Bookmark "implement singleton pattern on reflected class " Watch "implement singleton pattern on reflected class " New topic
Author

implement singleton pattern on reflected class

mangesh lele
Greenhorn

Joined: Jan 17, 2003
Posts: 18
is there any way by which i can implement the singleton pattern on a reflected class?
i'm obtaining the class name as a string from a properties file and using Class.forName(String) to instantiate a Class object by that name. is there a way to call a static method implemented in this class (e.g. getInstance(), to implement the singleton pattern )?
rite now i'm using the work-around of calling the newInstance method of Class and then typecasting it to the class name, thus making my static
getInstance method redundant.
Cindy Glass
"The Hood"
Sheriff

Joined: Sep 29, 2000
Posts: 8521
Try this:

Of course this presumes that the getInstance() method takes no parameters and is static.


"JavaRanch, where the deer and the Certified play" - David O'Meara
mangesh lele
Greenhorn

Joined: Jan 17, 2003
Posts: 18
thanx cindy
i almost used the exact same code
one question though, pertaining to the following line in the javadocs:

)]javadocs


If the underlying method is static, the class that declared the method is initialized if it has not already been initialized.

wot does this mean? forgive me if i'm missing some basic funda
Cindy Glass
"The Hood"
Sheriff

Joined: Sep 29, 2000
Posts: 8521
When a class is referenced, it is loaded by a classloader. Then it is linked which usually includes resolution of symbolic references in the class.
However the class itself is not initialized until specific events occur, such as invocation of certain reflective methods in the class library.
Initialization of a class or interface consists of invoking its static initializers (�2.11) and the initializers for static fields (�2.9.2) declared in the class.

Java Virtual Machine Specification 5.5 Initialization
mangesh lele
Greenhorn

Joined: Jan 17, 2003
Posts: 18
thanks again
i am soon gonna dive into the world of JVM
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: implement singleton pattern on reflected class