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I do not want to ruin or spoil the fun for you, but the Java documentation is a good start to look if the Hough Transforms are actually already ported to the Java interface.

When looking at the available functions to the left, you can see that there isn't a port yet so you will have to decide the following:

• Or you just stick with C++ if you want the complete OpenCV functionality available.
• Or you build a wrapper function for the Hough Transform and port it to Java yourself. If you do please consider making a pull request to add it to the source code.
• Or you could look for Java existing wrappers, like JavaCV and see if they already provide the functionality needed : http://code.google.com/p/javacv/