Corrections mineures de warning

src/main/java/viewer/Display.java

@@ -19,11 +19,10 @@ public class Display implements Initializable {
     private Canvas canvas;
 
     private Image image;
-    private ImageFactory imageFactory;
 
     @Override
     public void initialize(URL location, ResourceBundle resources) {
-        imageFactory = new BlankImageFactory();
+        ImageFactory imageFactory = new BlankImageFactory();
         // TODO : changer la fabrique d'image pour construire des images.
 
         this.image = imageFactory.makeImage();

src/main/java/viewer/Main.java

@@ -7,6 +7,7 @@ import javafx.scene.Scene;
 import javafx.stage.Stage;
 
 import java.io.IOException;
+import java.util.Objects;
 
 
 public class Main extends Application
@@ -18,7 +19,7 @@ public class Main extends Application
 
     @Override
     public void start(Stage primaryStage) throws IOException {
-        Parent root =FXMLLoader.load(getClass().getClassLoader().getResource("fxml/Display.fxml"));
+        Parent root =FXMLLoader.load(Objects.requireNonNull(getClass().getClassLoader().getResource("fxml/Display.fxml")));
         primaryStage.setTitle("Image display");
         primaryStage.setScene(new Scene(root));
         primaryStage.show();