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Access to variable applications: static, how is Java?

I have an instance variable in the view controller that I would like to share with the whole program. I'm not quite sure how to do this. Can I just declare it as a static instance variable and then access it through properties like ViewControllerClass.instancevariable?

Thank!

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In response to your comment related to the question:

If you have an instance variable in object X, any other object that has a reference to X can access this variable in the usual way:

[objectX myClassAInstanceVariable];
// Or, if declared with @property
objectX.myClassAInstanceVariable;

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