1. CS3157 Java UI Recitation

2. Material Covered: Overview of AWT components, Event Handling, creating applets, and sample UI. Not covered in recitation: Drawing, Images, Layout Manager

3. AWT Components Containers: Windows (Frame, Dialog, FileDialog), Panel, Scroll Pane Basic Controls: Buttons, Checkbox, Choice, List, MenuItem, TextField Others Components: Slider, ScrollBar, TextArea, Label, Canvas

4. Component Hierarchy All components except for menu related components inherit from the AWT Component class.

5. Windows, Frames and Dialogs are top level containers. Add components to another component. –i.e. Add a panel to a frame – Add a button to a panel Add event listeners to component

6. Event Handling 1.1 AWT Event Modeling –Event generated by event sources. –Listeners register to be notified about events Event handler implements event listener interface –public class MyEventHandler implements ActionListener { } Register listener on a component –myComponent.addActionListener(myEventHandler); Implementation of methods in the listener interface –public void actionPerformed(ActionEvent e) { // code that reacts to the action }

7. Applet extends java.applet.Applet class Methods: –init() // initialize applet –start() // start applet –stop() // stop applet –destroy() // cleanup, unload applet Running an applet –Embed applet in an html <APPLET CODE=AppletSubclass.class WIDTH=anInt HEIGHT=anInt>

8. Sample Applet See SampleApplet.html