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CS3157 Java UI Recitation

CS3157 Java UI Recitation. Material Covered: Overview of AWT components, Event Handling, creating applets, and sample UI. Not covered in recitation: Drawing, Images, Layout Manager. AWT Components. Containers: Windows (Frame, Dialog, FileDialog) , Panel, Scroll Pane

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CS3157 Java UI Recitation

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  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> </APPLET>

  8. Sample Applet • See SampleApplet.html

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