aspose file tools*
The moose likes Programmer Certification (SCJP/OCPJP) and the fly likes LinkedHashMap - trying to use the method removeEldestEntry 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 "LinkedHashMap - trying to use the method removeEldestEntry" Watch "LinkedHashMap - trying to use the method removeEldestEntry" New topic
Author

LinkedHashMap - trying to use the method removeEldestEntry

Nigel Shrin
Ranch Hand

Joined: May 18, 2009
Posts: 140
The program compiles but without using "removeEldestEntry", I am not sure if it should be inheriting a size() from HashMap, or whether I need to implement one, and if so what it should contain.
Perhaps I also need a different constructor for the LinkedHashMap. I have searched the ranch and web I have not found a clear example.

I think it should get called automatically from the put method on line 21.



Many thanks!


Nigel
Nigel Shrin
Ranch Hand

Joined: May 18, 2009
Posts: 140
I've worked it out - though not 100% clear as to how it works. It appears the method needs to be within the constructor of LinkedHashMap.
Also the third argument in the constructor pertaining to the sort order has to be false.

Working version that keeps the last five entries only:



Any further tips appreciated! thanks!
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: LinkedHashMap - trying to use the method removeEldestEntry