Question

I’m writing a user’s GUI and I want to create a method that will be create various number of buttons with previously defined names and actions. But I have no idea how to write method selection which is based on variable value. Google gives no useful information about it. Can anyone help with this or it’s just impossible?

Here is some code example:

    String[] actions={"testAction1","testAction2","testAction3"};
    defaultDialogWindow(actions,"test1", "test2", "test3");

    void defaultDialogWindow(String[] actions, String... bNames){
          double layoutX = 25;
          double spacing = 15;
          final Stage dialogStage = new Stage();
          dialogStage.initOwner(stage);
          dialogStage.initModality(Modality.WINDOW_MODAL);   
          dialogStage.setFullScreen(false);
          dialogStage.setResizable(false);
          dialogStage.setHeight(100);
          dialogStage.setWidth(bNames.length*100+(bNames.length-1)*spacing+2*layoutX+5);
          dialogStage.setScene(new Scene(buttonBuilder(actions,spacing,layoutX,bNames)));
          dialogStage.show();  
    }

    HBox buttonBuilder(String[] actions, double spacing,double layoutX,String... bNames){
          HBox lBar = new HBox(10);
          final ReadOnlyDoubleProperty menuWidthProperty = lBar.widthProperty();
          lBar.setAlignment(Pos.CENTER_LEFT);
          lBar.setLayoutX(layoutX);
          lBar.setSpacing(spacing);
          for(String text : bNames){
              Button newButton = new Button();
              newButton.setText(text);
              newButton.setFont(Font.font("Times New Roman", 22));
              newButton.prefWidthProperty().set(100);
              newButton.prefHeightProperty().set(50);
              newButton.setOnAction(new EventHandler<ActionEvent>() {
                  @Override
                  public void handle(ActionEvent paramT) {

                      **HERE MUST BE ACTION CALL BASED ON bNames VALUE**

                      System.out.println("button pressed");
                  }
              });
              lBar.getChildren().add(newButton);
          }
          System.out.println(lBar.prefWidth(-1));
          return lBar;
      }

      void testAction1(){
          System.out.println("this is test action one");
      }

      void testAction2(){
          System.out.println("this is test action two");
      }

      void testAction3(){
          System.out.println("this is test action three");
      }**strong text**

Answer 1

Use HashMap:

Map<String, Runnable> actions2methods = new HashMap<>;
actions2methods.put("Action1", new Runnable { public void run() { testAction1(); }));

You can even make this easier if your actions would be Runnable instead of methods from the start.