Sort of singleton pattern , design question

Question

Hi
i need to a class which has only one instance( can use a singleton pattern) but the problem is there have to be some variables to be initialised and this class will not know how to initialise them, how do i desin it
public class MyData
private String data;
private String data2;
private static MyData instance;
public MyData getInstance()
return instance;
public String doSomeThing(String parm3)
// but parm1 and parm2 are not initalised, they are common for all classes,
// how do i desing it
return parm1 + parm2 + parm3;
ashish

Answer 1

hi
I know it is not a good desing , but my problem is
that my SingleTon pattern is sort of worker class,
which will be accessed from many other classes, these
classes also dont know the values of parm1 and parm2
required by the worker class,
these values are setup by the startup java class
which reads them from a properties file, this worker
class has no knowledge of this properties file and
hence cannot retrieve it...
so what are my optionsHave the singleton get the values itself from system properties, or a file or database or java.util.Preferences or some other appwide configuration.
Or do what DrC suggested and have a factory do that and let the factory push the values to the singleton.
, i dont want to make these
variables static since there will be problem in my
applicationAnd what problem would that be?