Any Java hash tree implementations? [closed] - java

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I want to implement an algorithm that needs to use a hash tree. What are some good, easy-to-understand Java hash tree implementations? Are there books, websites or PDFs on the Internet that give a good explanation on how a hash tree works and how I could implement it?

Yes, there's a Java implementation of hash tree here:
http://jmeter.apache.org/api/org/apache/jorphan/collections/HashTree.html
There's an explanation here:
http://www.google.com/url?sa=t&rct=j&q=java%20hash%20tree&source=web&cd=17&ved=0CFUQFjAGOAo&url=http%3A%2F%2Fciteseerx.ist.psu.edu%2Fviewdoc%2Fdownload%3Fdoi%3D10.1.1.21.6279%26rep%3Drep1%26type%3Dpdf&ei=tQijTrvMIOTb0QHRxIyBBQ&usg=AFQjCNGTjFqUeqzT8ldQQComx24SF4Z0ow
Google is your friend.

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What's the purpose of fromReflectedMethod and toReflectedMethod in JNI? [closed]

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I was reading the JNI spec and saw the reflection support methods section.
I don't quite understand what they are used for or what's the intended purpose. Since method ID is looked up using name and signature, don't we already have that information? And if we want to get more details, we can always write a java wrapper. So that cannot be the purpose I thought.

Diff files and mark as yellow in Java [closed]

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Does anyone could recommend a framework or a java api that could help me compare two files? I would to compare both and mark one as yellow where we have the differences, like Tortoise do as example.
This question and its answers seem to be related to what you are asking. There referred APIs and libraries include
NetBeans Diff API
google-diff-match-patch

How to print the directory tree from the list of strings? [closed]

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I'm looking for a library that could help me to print the directory tree from the list of strings.
List
"/a/b/c/file1.txt"
"/a/b/c/file2.txt"
"/a/b/file3.jpg"
and so on...
You can try abego tree layout. It gives you a way to display trees. It doesn't appear to be well documented but it works well. Here is a link to how to use it. https://code.google.com/p/treelayout/

Java library for graphs [closed]

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what is the best Java library for manipulating graphs (specifically, for social network analysis)? I've seen Jung, but I was wondering if you knew anything better (I don't need to visualize networks, only computation).
Thank you
I've found jgrapht pretty useful - it has all the major algorithms (e.g. Bellman-Ford, ...)
neo4j is the choice
And here is a video
If you are aiming for high efficiency
http://grph.inria.fr/

Rabin Hash Functions - FAST Implementation in Java [closed]

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I am looking for an implementation of the Rabin Hash Function in Java, Can anyone recommend a fast library?
Update:
I've just tested the library here.
It takes ~2200ms to hash 1mm random urls on my 2GHz processor.
This is certainly good enough for my needs, however I will test another library when I get a monent and post the results here.
Here's my Java implementation.
http://code.google.com/p/rabinfingerprint/
It also includes arbitrarily large irreducible polynomials (using BigIntegers).
I've not used it myself, but you can try the Rabin Hash Function project on Source Forge.

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