Writing the hashtable content (both keys and values) into a text file

Hello,
I have a hashtable which have some keys and respective values in it. Now I want to write all thoses content into a text or log file. Can anyone please tell me how to write it.
thanks,
chaitanya

Properties is a subclass of Hashtable. It'll probably work just fine as a drop-in replacement.
Otherwise...if all keys and values are text, then loop through the Entry objects in the Map in question (Hashtable is a Map, and you probably shouldn't be using Hashtable anyway), or loop through the keys and grab the corresponding value for the keys. Read the API docs for java.util.Map. It's pretty straightforward.

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ertas

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Trollhorn wrote:
Hi there!
I'm sitting here implementing a binary tree, and I was just wondering why most of the binary tree examples encapsulate both a key AND a value in their nodes. Wouldn't it be sufficient to just store comparable objects in the nodes (or provide a comparator for alternative ordering)?Yes.
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[http://www.cs.princeton.edu/introcs/44st/]
[http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/6-006Spring-2008/CourseHome/index.htm]
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Best Regards
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Developers Field Notes | www.bog1.de

Hey, you can do it as follows
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Please click "Propose As Answer" if this post solves your problem or "Vote As Helpful" if this post has been useful to you.

HashMap keys and values not staying consistent (my fault, but why?)

Alright, after starting out for the very first time with HashMaps a few hours ago, I've gotten the hang of them decently I think. I am encountering a problem, though, when I try to get user-selected keys + values to display. My code is:
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Say the HashMap keys and values are
"Rome", "-2"
"Chicago", "6"
"New York", "5"
"Paris", "-1"
If I type "Rome" in when I execute this method, it gives me the correct output - "Rome: GMT -2"
If I then re-run the method, as to display a different one, I get "Chicago: GMT -2"
It's like the name the user inputs is updating, obviously, but the value of the HashMap that goes along with the user-input doesn't match up or something. My code is confusing myself after looking at it for nearly 10 hours, so I apologize that I had to post something so trivial here - I'm sure it's just a problem with my wordings....any help would be greatly appreciated.

Hello,
It's very possible I'm missing some things here, but I've attempted to review your code.
Let me just define the specs of the code as I see them:
Method useZone accepts String input, which is "supposed" to be the key to a hashmap.
The timezone offsets are the value's in this hashmap.
The value is of type Integer.
If a key is properly selected, print out GMT + or - the offset?
If I have this correct, consider the following implementation:
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Also, if you are using java 1.5 declare the map as follows:
Map<String, Integer> hm = new HashMap<String, Integer>();And you can get rid of the casts. I would also suggest renaming the hashmap to something that describes what it holds, rather than it's object type. Maybe something like timeZoneMap - or offsetMap. I would also consider renaming "use" to something that describes the data it might hold, instead of something that describes the workflow.
Variable naming is very difficult! I would suggest renaming all of your variables, but I think those are the only ones I kept!
Edited by: Adam_Schaible on Nov 28, 2007 12:09 PM

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Writing the hashtable content (both keys and values) into a text file

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