鲤鱼吃菠菜吗

Summary

We learned some cool features in this chapter:

We configured our development environment using Eclipse, NetBeans, and Maven.
We learned the details of the code IDE wizards (or Maven) generated when we create a new project.
We learned how components are internally arranged in a tree, where the root is a class extending UI.
We learned that the init method of our UI class is like a starting point for building our user interface.
We used labels and buttons and attached them to a vertical layout.
We also learned how easy it is to show notifications using the static methods of the Notification class.

Now you are able to develop simple web applications using Vaadin. The next chapter will teach you how to use more complex input components.