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+package view.gui;%0A%0A/**%0A * Provides an interface for the GUI to implement%0A * in accordance with the Observer/Observable Design pattern.%0A * %0A * @author Christopher Chapline%0A * @author Christopher Toepfer%0A * @author David Christy%0A * @author James Fagan%0A */%0Apublic interface Observer %0A%7B%0A%09public void update();%0A%7D%0A

Create Observer.java