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MatOfKeyPoint has a toArray() function, the output from that is nicely printable:

KeyPoint a = new KeyPoint(3,3,3);
KeyPoint b = new KeyPoint(4,4,4);

MatOfKeyPoint mfk = new MatOfKeyPoint(a,b);

System.err.println(mfk.toArray());

KeyPoint [pt={3.0, 3.0}, size=3.0, angle=-1.0, response=0.0, octave=0, class_id=-1]
KeyPoint [pt={4.0, 4.0}, size=4.0, angle=-1.0, response=0.0, octave=0, class_id=-1]