How do I persist data without global variables?

Question

I\'m used to scripting languages. PHP, Javascript etc. and I\'ve written a few relatively simple Java and C# apps. This is a question I\'ve repeatedly needed an answer for,

Answer 1

Function A would be part of a class (call it C). Function A could then store the logon credentials and provide a function (or in C#, a property) to obtain the credentials. When they are required, you can simply use the property to obtain the stored credentials and pass them into Function B (on a different class).

class C
{
    public void functionA()
    {
         credentials = obtainCredentials;
    }

    private LogonCredentials _logonCredentials = null;

    public LogonCredentials logonCredentials
    {
        get { return _logonCredentials; }
    }
}

class D
{
    public void functionB(LogonCredentials credentials)
    {
       //do stuff
    }
}

///other stuff
///other function ...
    ...
    instanceC = C();
    instanceC.functionA();
    ///more stuff here
    instangeD = D();
    instanceD.functionB(instanceC.logonCredentials);