java.util.LinkedHashMap
As you can see from the code its very simple. All you have to do is extend
java.util.LinkedHashMap
and override its protected removeEldestEntry()
method so that it checks if the size of map is greater than a size you specified while creating the Map if yes remove the eldest entry Now the question is when Map is full which entry will it remove, you have 2 options
- Eldest: If you just want to remove the first entry that you inserted in the Map when adding a new entry then in your constructor you could use
super(cacheSize, 0.75f);
, so LinkedHashMap wont keep track of when a particular entry were accessed. - Least recently used (LRU): But if you want to make sure that the entry that was least recently used should be removed then call
super(cacheSize, 0.75f, true);
from constructor of your LRUCache so that LinkedHashMap keeps track of when entry was accessed and removes the Least recently used entry
27 comments:
Here is the pic of the setup I have<
you can look at the image over here https://www.dropbox.com/s/ubik71rxfz2rg25/issue-class-not-found.JPG?dl=0
I would like to say thank you Sunil for sharing this code over here. I am also working on Java and the codes you have shared here was very useful for me. implementing cache is necessary in various application and thank you so much for the updates.webdesign magazine
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Thanks for the post quite helpful to me. As you have mentioned with the help of java, we are creating a lot of tools that help us to make new software tools which help to improve the performance.
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