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From your post, I would guess SingleThreadModel is a marker. From the various posts, I gather that Interfaces are containers that store classes that have that are similar funtionality but diverse ways of implementing functionality. I still a bit hazy on your statement "if you implement the required methods." Can you elaborate a bit.... thanks! dan -----Original Message----- From: Joe Teff [mailto:joeteff@earthlink.net] Sent: Tuesday, March 20, 2001 1:02 PM To: JAVA400-L@midrange.com Subject: RE: Understanding Implements Interfaces are used in two ways: 1. Contracts - if you implement the required methods, then you can be one (i.e. your object can be referenced by that kind of data type). Container c = new JPanel(); 2. Markers - no methods to implement. Used to mark objects for a specific purpose. Serializable is an example. It has no methods. Any class that implements it, can be used in readObject() and writeObject() methods. +--- | This is the JAVA/400 Mailing List! | To submit a new message, send your mail to JAVA400-L@midrange.com. | To subscribe to this list send email to JAVA400-L-SUB@midrange.com. | To unsubscribe from this list send email to JAVA400-L-UNSUB@midrange.com. | Questions should be directed to the list owner: joe@zappie.net +---
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