Hashmap to TXT and TXT to Hashmap

[elvinny]

Hi!!!
I'm Luis from Portugal and i would like to know how i can save values from a HashMap(huge size) to a text file(.txt, .dat or something else that can be read). After that how can i load that file to a HasMap.

Thanks

[sukatoa]

It depends on you.... ( structuring patterns )

You can use FileWriter class for saving values in a file.

You can use Scanner class for reading back the generated text file.

[elvinny]

I'm using an Hashmap to keep float values:

Code:

...
 public HashMap qValues = new HashMap(10000,(float)0.75);
...
qValues.put(p.hashCode(), new Float (v));
...

p is a class of two different strings (Pair state/action). The hash code generated is the sum of the hash code of each different string
v is the value i want to keep (Q value in Reinforcement Learning )

Thanks for the reply

[Chris.Brown.SPE]

I've seen this question quite a few times and have never seen an easy fix for it. I with there was a .toString() function that had all of the values in it, but there aren't. So unless you find something we all haven't you are going to have to traverse the hashmap saving each value then read them back in and put them back into the hashmap for loading. It should be pretty trivial to program, but it will not be quick on large data. Goodluck.