Singleton pattern is used when you need only one instance of a class to serve the requests ( like printer ). Check this
article . It's being discussed many times here.
[ May 03, 2005: Message edited by: Srinivasa Raghavan ]
Thanks & regards, Srini
MCP, SCJP-1.4, NCFM (Financial Markets), Oracle 9i - SQL ( 1Z0-007 ), ITIL Certified