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ORB feature matching in Java

So i am currently working on converting an opencv program in c++ to java to do 2d feature matching. I've been having trouble understanding what some of the lines are doing and how i might be able to find their java equivalent, any help would be appreciated thanks!

    // Calculate the ORB descriptor based on the keypoint
    Ptr<Feature2D> orb_feat = ORB::create();
    Mat descriptors;
    orb_feat->compute(input, keypoints, descriptors);