vaadin-framework/src/com/itmill/toolkit/demo/HelloWorld.java

/* 
@ITMillApache2LicenseForJavaFiles@
 */

package com.itmill.toolkit.demo;

import com.itmill.toolkit.ui.Label;
import com.itmill.toolkit.ui.Window;

/**
 * The classic "hello, world!" example for IT Mill Toolkit. The class simply
 * implements the abstract {@link com.itmill.toolkit.Application#init() init()}
 * method in which it creates a Window and adds a Label to it.
 * 
 * @author IT Mill Ltd.
 * @see com.itmill.toolkit.Application
 * @see com.itmill.toolkit.ui.Window
 * @see com.itmill.toolkit.ui.Label
 */
public class HelloWorld extends com.itmill.toolkit.Application {

    /**
     * The initialization method that is the only requirement for inheriting the
     * com.itmill.toolkit.service.Application class. It will be automatically
     * called by the framework when a user accesses the application.
     */
    public void init() {

        /*
         * - Create new window for the application - Give the window a visible
         * title - Set the window to be the main window of the application
         */
        final Window main = new Window("Hello window");
        setMainWindow(main);

        /*
         * - Create a label with the classic text - Add the label to the main
         * window
         */
        main.addComponent(new Label("Hello World!"));

        /*
         * And that's it! The framework will display the main window and its
         * contents when the application is accessed with the terminal.
         */
    }
}