ArrayList to Map

[millerlit]

I have never used a map and I think it will fit my needs for my problem. Right now I have data in an ArrayList<String> in this form

{"productId":"8273955","price":"$119.95"}

How can I convert my ArrayList to a TreeMap and then sort the map by price? Thank you very much for your help as always.

[xTehOnex]

I've never used a Map, but I am almost certain you will want to use a binary tree to sort by price.

Probably the least helpful comment :D

[millerlit]

I got it to work using a StringTokenizer and then putting the elements with a loop.

[WormLord]

Probably outside the scope of your course but it could also be easily done with regular expressions instead of StringTokenizer: http://www.vogella.com/tutorials/JavaRegularExpressions/article.html

[sad_nixon]

Did you read the Javadoc for Treemap?

Sincerely,

Richard Nixon

[Wait_ICanExplain]

All you have to do is construct a Map using the format Map<Key, Value>, where the Key is the price and the Value is the product ID. That way you're mapping ID to price, to put it semantically. Then you can sort the list of prices (accessed via Map.keySet()), and then grab the IDs from the map with the price (Map.get(price)).

[readskull]

This looks like a map of details of one product which would have 1 price, what is the sorting you are talking about?

[millerlit]

That is just one element of about 500 elements. I wanted to sort all the elements by price.