Deterding, S., Dixon, D., Khaled, R. and Nacke, L. (2011a) âFrom Game Design Elements to Gamefulness: Defining âGamificationââ, Envisioning Future Media Environments - Conference proceedings, MindTrekâ11, Tampere, pp. 9â15.
The payback method is a simple way to evaluate the number of years or months it takes to return the initial investment. The payback period is usually expressed in years. Start by calculating net cash flow for each year: net cash flow year one = cash inflow year one - cash outflow year one.
There are four basic techniques to fake a callback function in Java. 1  Subclassing. 2  Delegation via subclassing. 3  Pass a Callback delegate object that implements an interface for the callback method(s). 4  This is how it is most commonly done.