Data-Centric Applications with Vaadin 8

Implementing support classes

The previous interface won't compile. There are two classes that need to be implemented: WorkingAreaComponent and MenuOption. The addWorkingAreaComponent(WorkingAreaComponent) method expects a WorkingAreaComponent that encapsulates a caption and the corresponding Vaadin component to be shown. This interface is defined as follows:

public interface ApplicationLayout extends Component {    public static class WorkingAreaComponent            implements Serializable {        private final String caption;        private final Component component;        public WorkingAreaComponent(String caption,                Component component) {            this.caption = caption;            this.component = component;        }       ... hashCode(), equals(), and getters     }    ...}

The WorkingAreaComponent class implements ...