added som comments

src/main/java/app/controllers/EditorController.java

@@ -4,8 +4,6 @@ import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.PrintWriter;
 import java.net.URL;
-import java.nio.file.Files;
-import java.nio.file.Paths;
 import java.util.Collection;
 import java.util.ResourceBundle;
 import java.util.Scanner;
@@ -138,7 +136,8 @@ public class EditorController implements Initializable, Controller {
   }
 
   /**
-   * Updates the content of the editor to a specific filepath
+   * Updates the content of the editor to a specific filepath. Otherwise it will
+   * open an error dialog to give the user feedback about what has happened.
    * 
    * @param filePath The path of the file
    * @throws FileNotFoundException
@@ -169,6 +168,11 @@ public class EditorController implements Initializable, Controller {
     }
   }
 
+  /**
+   * Saving/Writing to the file based on the spesific filepath. Otherwise it will
+   * open an error dialog to give the user feedback about what has happened.
+   */
+
   private void saveCodeArea(String filePath) {
     try (PrintWriter writer = new PrintWriter(new File(filePath))) {
       if (filePath.endsWith(".java") || filePath.endsWith(".md")) {
@@ -179,18 +183,28 @@ public class EditorController implements Initializable, Controller {
 
     } catch (FileNotFoundException ex) {
       Alert error = new Alert(AlertType.ERROR);
-      error.setContentText("Could not save file!\nMust be a java or md file. Try again.");
+      error.setContentText("Could not save file!\nMust be a java or md file or not null. Try again.");
 
       error.showAndWait();
       System.err.println(filePath);
     }
   }
 
+  /* ------------------------------------------------------------------------ */
+  /* SUBSCRIPTIONS */
+  /* ------------------------------------------------------------------------ */
+
+  /**
+   * Updates Code Area (read from file) whenever the FileSelected is changed
+   */
   @Subscribe
   private void handle(FileSelectedEvent event) {
     this.setEditorContent(event.getPath());
   }
 
+  /**
+   * Save file (write to file) whenever the save in the menubare is selected
+   */
   @Subscribe
   private void handle(SaveFile event) {
     this.saveCodeArea(event.getPath());

src/main/java/app/controllers/FiletreeController.java

@@ -52,6 +52,10 @@ public class FiletreeController implements Initializable, Controller {
     this.eventBus.register(this);
   }
 
+  /* ------------------------------------------------------------------------ */
+  /* FILETREE */
+  /* ------------------------------------------------------------------------ */
+
   /**
    * The displaying of the fileTree. The inputChosen(the path) is aquired from the
    * eventBus (OpeFileProjectEvent). The root is created as a CheckBoxItems and
@@ -133,6 +137,13 @@ public class FiletreeController implements Initializable, Controller {
     parent.getChildren().add(element);
   }
 
+  /* ------------------------------------------------------------------------ */
+  /* MouseClick */
+  /* ------------------------------------------------------------------------ */
+
+  /**
+   * Handles whenever a filetree item is clicked twice.
+   */
   @FXML
   private void handleMouseClick(MouseEvent event) {
     if (event.getClickCount() == 2) {
@@ -154,6 +165,14 @@ public class FiletreeController implements Initializable, Controller {
     }
   }
 
+  /* ------------------------------------------------------------------------ */
+  /* SUBSCRIPTIONS */
+  /* ------------------------------------------------------------------------ */
+
+  /**
+   * Updates the filetree whenever a new ProjectPath is selected.
+   */
+
   @Subscribe
   private void handle(OpenProjectEvent event) {
     this.showTree(event.getPath());

src/main/java/app/controllers/MenubarController.java

@@ -1,8 +1,6 @@
 package app.controllers;
 
 import java.io.File;
-import java.io.FileNotFoundException;
-import java.io.PrintWriter;
 import java.net.URL;
 import java.nio.file.Path;
 import java.nio.file.Paths;
@@ -38,7 +36,7 @@ import javafx.stage.FileChooser;
 import javafx.stage.Stage;
 
 /**
- * A FXML controller that controls the filetree component of the UI
+ * A FXML controller that controls the menubar component of the UI
  */
 public class MenubarController implements Initializable, Controller {