File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
http://aspose.com/file-tools
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic

Singleton two or more instances

 
Harikrishna Gorrepati
Ranch Hand
Posts: 423
  • 0
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi, The following is asked me several times during the interview
Question : Can we have singleton with 2 instances or 3 instances or more ? How to achieve that ?
My Answer : It cannot be more than 1 instance.
But interviewers are never happy with my answer even though I gave them the Singleton code. Please let me know how to get it. Please post code which helps me a alot.
 
Rob Spoor
Sheriff
Pie
Posts: 20372
44
Chrome Eclipse IDE Java Windows
 
fred rosenberger
lowercase baba
Bartender
Pie
Posts: 12015
24
Chrome Java Linux
  • 0
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Start a second JVM...
 
Stephan van Hulst
Bartender
Pie
Posts: 4826
34
Chrome Netbeans IDE Windows
  • 0
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Personally I've always thought of the Singleton pattern as one that generally limits the amount of instances created, but not necessarily to a single instance. The name is misleading, but the general case makes more sense for a pattern.
 
Matthew Brown
Bartender
Posts: 4549
8
Java Netbeans IDE Scala
  • 0
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
fred rosenberger wrote:Start a second JVM...

Or just use a second class loader?

It could be that they're thinking about distributed applications...in which case unless you're doing something clever there's nothing to stop the separate components each creating an instance.
 
Don't get me started about those stupid light bulbs.
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic