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As for the MatOfXxx types I'd suggest you read this answer

As for the C++ vs Java types correspondence:

vector<Point>    : MatOfPoint
vector<Point2f>  : MatOfPoint2f
vector<Point3i>  : MatOfPoint3
vector<Point3f>  : MatOfPoint3f
vector<KeyPoint> : MatOfKeyPoint
vector<DMatch>   : MatOfDMatch
vector<Rect>     : MatOfRect
vector<uchar>    : MatOfByte
vector<char>     : MatOfByte
vector<int>      : MatOfInt
vector<float>    : MatOfFloat
vector<double>   : MatOfDouble
vector<Vec4i>    : MatOfInt4
vector<Vec4f>    : MatOfFloat4
vector<Vec6f>    : MatOfFloat6