Hi Alan, Thank you for the explanation and the link. It makes much more sense now.
Gale On Fri, Aug 5, 2016 at 1:23 PM Alan Williams <[email protected]> wrote: > On 05-Aug-16 18:42, Gale Naylor wrote: > > Hello Gale > > > In CwlContextualView.java (I used the wrong filename in my previous > email) > > I'm also curious about the two private, final (but not static) constants > > (?): configurationBean and activity. > > > > I'm not sure this StackOverflow answer is 100% relevant because > > configurationBean and activity do not have initial values, but this is > all > > I've been able to find online: > > > http://stackoverflow.com/questions/1415955/private-final-static-attribute-vs-private-final-attribute > > If an attribute is not static then each instance of the class has its > own attribute. So, > > private final CwlActivityConfigurationBean configurationBean; > > means that each CwlContextualView has its own configurationBean value. > > If an attribute is declared as static, then all instances of the class > share the same attribute value. > > The private means that the value of the configurationBean cannot be > accessed (directly) outside of the CwlContextualView. So > > fred = myCwlContextualView.configurationBean // will not work > > The final means that once the attribute has a value it cannot be > changed. Even stronger, the value must be specified either in the > declaration of the attribute, or when you construct an instance of > CwlContextualView. (There are weird exceptions to the last sentence that > are best ignored and never mentioned in polite company.) > > If you look at > > public CwlContextualView(CwlDumyActivity activity) > > which makes a CwlContextualView, it contains the line: > > this.configurationBean = activity.getConfiguration(); > > So once you have made a CwlConfigurationView, it has a configurationBean > attribute, that nothing else can see, and that has a fixed value. > > > Can anyone point me to information that would help me understand this > > nomenclature? > > I think > > http://stackoverflow.com/questions/13772827/difference-between-static-and-final > explains static and final well. > > > Thanks, > > > > Gale > > Alan > >
