It's not a secret anymore!*
The moose likes Programmer Certification (SCJP/OCPJP) and the fly likes adding objects to HashMap that have duplicate keys Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Certification » Programmer Certification (SCJP/OCPJP)
Bookmark "adding objects to HashMap that have duplicate keys" Watch "adding objects to HashMap that have duplicate keys" New topic
Author

adding objects to HashMap that have duplicate keys

Rachel Glenn
Ranch Hand

Joined: Oct 24, 2012
Posts: 95
If I have a HashMap, and I call .put() several times with the same key..for example..



Then the first put() call will return true and the second put() call will return false because the "Monday" key already exists?
Jayesh A Lalwani
Bartender

Joined: Jan 17, 2008
Posts: 2376
    
  28

put doesn't return a boolean. put returns the previous value. So, first call will return null and second call will return the first object
 
jQuery in Action, 2nd edition
 
subject: adding objects to HashMap that have duplicate keys