(Solved) Merge Arraylists inside an ArrayLists of Arraylists [closed]

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The following method should do the trick:

public static <T> void merge(ArrayList<ArrayList<T>> arrayLists) {
    int blockSize = 6;
    for(int i=blockSize; i<arrayLists.size(); i++) {
        arrayLists.get(i % blockSize).addAll(arrayLists.get(i));
    }
    arrayLists.subList(blockSize, arrayLists.size()).clear();
}

You can convert blockSize to the method parameter if you like.

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solved Merge Arraylists inside an ArrayLists of Arraylists [closed]