cleaning up some classes

src/sample/Controller.java

@@ -32,12 +32,17 @@ public class Controller {
         //delete all thoughts and display the list
         listView.getItems().clear();
 
+        //get instance of sound controller and play sound
         SoundController sound = SoundController.getInstance();
         sound.playSound();
     }
 
     public void handleHurlSelected() {
+
+        //get all indexes for those thoughts to be deleted
         ObservableList<Integer> indices = listView.getSelectionModel().getSelectedIndices();
+
+        //loop over all thoughts and delete the once how are selected
         for (int i = indices.size()-1; i >= 0; i--)
             listView.getItems().remove((int) indices.get(i));
         }

src/sample/Main.java

@@ -2,18 +2,10 @@ package sample;
 
 import javafx.application.Application;
 import javafx.fxml.FXMLLoader;
-import javafx.scene.Node;
 import javafx.scene.Parent;
 import javafx.scene.Scene;
-import javafx.scene.control.Button;
-import javafx.scene.control.ScrollPane;
-import javafx.scene.control.TextArea;
-import javafx.scene.control.TextField;
-import javafx.scene.text.Text;
 import javafx.stage.Stage;
 
-import java.net.ContentHandlerFactory;
-
 public class Main extends Application {
 
     @Override
@@ -24,11 +16,10 @@ public class Main extends Application {
         primaryStage.setScene(sceneMain);
 
         primaryStage.show();
-        
     }
 
-
     public static void main(String[] args) {
+
         launch(args);
     }
 }

src/sample/Thought.java

 package sample;
 
 public class Thought {
-    private String thoughtText;
+    private final String thoughtText;
 
     public Thought(String txt){
         this.thoughtText = txt;