How to read/write output of "hog.processimage(img)" from catalano libraries. It is stored in "arraylist<double[]> ".

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Java

image-recognition

I used "hog.ProcessImage(img)" from the catalano libraries and stored the result in "ArrayList<double[]> ". Now i want to display the content stored in the array list as well as write it to a .arff file (weka Classifier) to use the hog features for recognition. When i use print with the array list i get the result as "[[D@1b256636, [D@7aab77f, [D@788b0c96,.......". Any insight in regards to overcome this problem is appreciated.

What I have tried:

I have googled this problem and tried methods such as .toString(), .toArray(), and other similar solutions but to no avail.