Implemented Abstract Controller class which made code a lot short and easier to read

src/main/java/seng202/group9/GUI/Controller.java

@@ -0,0 +1,69 @@
+package seng202.group9.GUI;
+
+import javafx.fxml.Initializable;
+import seng202.group9.Controller.App;
+import seng202.group9.Controller.SceneCode;
+
+import java.net.URL;
+import java.util.ResourceBundle;
+
+/**
+ * Created by Gondr on 16/09/2016.
+ */
+public abstract class Controller implements Initializable{
+    private App parent;
+
+    /**
+     * set Parent app
+     * @param parent
+     */
+    public void setApp(App parent){
+        this.parent = parent;
+    }
+
+    /**
+     * get parent App
+     * @return
+     */
+    public App getParent(){
+        return parent;
+    }
+
+    /**
+     * functions to load
+     */
+    public abstract void load();
+
+    /**
+     * Replaces content and does normal loading
+     * @param scene
+     */
+    public void replaceSceneContent(SceneCode scene){
+        try {
+            Controller controller = (Controller)
+                    parent.replaceSceneContent(scene);
+            controller.setApp(parent);
+            controller.load();
+            controller.loadOnce();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Functions here will only load once and after the load function.
+     */
+    public void loadOnce(){
+
+    }
+
+    /**
+     * Initialize statement before anything loads.
+     * @param location
+     * @param resources
+     */
+    public void initialize(URL location, ResourceBundle resources) {
+
+    }
+
+}