1. The Java Display Manager (JDM)

2. JDM Widgets Many JDM widgets correlate with medm widgets –Button, MenuButton –Bar, Slider, Meter, Indicator –Cartesian Plot, Stripchart (8 pens) –Label, Text Field –Bit Field

3. JDM Widgets (cont’d) More widgets –Wheelswitch –Animated canvas (double-buffered) Each widget is a Java bean

4. Building JDM Screens Screens can be built with any Java IDE that supports Java beans Java introspection allows IDE to learn about bean attributes

5. Run-time JDM Runs on JVM 1.1.8 and higher Bean serialization enables execution of “screens” through a browser “Screens” can be executed directly as applets

6. JDM Communication Schematic JDM Client CDEV Gateway IOC DB

7. JDM summary Positives –Provides great flexibility; run-time behavior –Widgets are easily extensible through inheritance Drawbacks –“Screens” are fat –Administration is not straightforward