Following this link,
http://www.mediafire.com/developers/sdks_and_tools/java/basics/
after downloading from
https://github.com/MediaFire/mediafire-java-sdk/releases
i added the content from mediafire-java-sdk-3.2.1\src\main\java\com to my netbeans project as there were no jars to add like a library. This is the result when adding the code from Custom Implementations of Interfaces used by Configuration (RECOMMENDED)

The Configuration class from com.mediafire.sdk.config was correct but it doesnt seem to have any Builder in it, any suggestions to make this code run?
PD: neither the code from https://github.com/MediaFire/mediafire-java-sdk/wiki seems to work.
MFConfigurationBuilder mfConfigurationBuilder = new MFConfigurationBuilder(yourAppId);
MFConfiguration mfConfiguration = mfConfigurationBuilder.build();
Nothing of this is found in any package.
Documentation is out of date. More information in their forum
Please refer to the older github version if you insist on using Java API or wait until new documentation is released.
https://github.com/MediaFire/mediafire-java-sdk/tree/04fbd929d5c95f510361ba50d95301f3ad3c4b5e