OTExample Observer/Flower
< OTExample Observer
Revision as of 06:29, 23 February 2010 by Stephan.cs.tu-berlin.de (Talk | contribs) (New page: '''Simple base class for the Observer pattern''' (''note, that this class bears no pre-planning for being observed''). <source lang="otj"> package flower_example; /** * @author Bruce E...)
Simple base class for the Observer pattern
(note, that this class bears no pre-planning for being observed).
package flower_example; /** * @author Bruce Eckel (original Java example) * @author Miguel P. Monteiro (adaptation to OT/J) * * Base class to play the Subject role */ public class Flower { private boolean isOpen; public Flower() { isOpen = false; } /** Opens its petals. */ public void open() { isOpen = true; print(); } /** Closes its petals. */ public void close() { isOpen = false; print(); } void print() { System.out.println("=> The flower is now "+(this.isOpen?"open":"closed")+"."); } }