Time for action – a tedious application

Follow these steps to create a tedious to use application:

1. Create a new Vaadin project. We are using shortcut as project name.

2. Code your UI class:

   public class ShortcutUI extends UI {
   
     protected void init(VaadinRequest request) {
       final VerticalLayout layout = new VerticalLayout();
       layout.setMargin(true);
       layout.setSpacing(true);
       setContent(layout);
   
       final TextField tf = new TextField("Your data:");
       layout.addComponent(tf);
   
       Button button = new Button("Send data (ENTER)");
   
       button.addClickListener(new Button.ClickListener() {
         public void buttonClick(ClickEvent event) {
           layout.addComponent(new Label(tf.getValue()));
           tf.setValue("");
         }
       });
   
       layout.addComponent(button);
     }
   
   }

3. Run the application and try to send many data.

What just happened?

If you continue using the application for a long time, one of two things will happen: Your hand will start to feel tired because of the huge amount of...