public List<double[]> toListTuple(double [] array){
    double [] sublist = null;
    for(int i = 0;i<array.length;i++){
        if(i%3==0)
            sublist = new double[3];
        sublist[i%3] = array[i];
    }
}

List<double[]> list = new ArrayList<>();
for(int i = 0; i < values.length; i += 3) {
   double[] d = new double[3];
   d[0] = values[i];
   d[1] = values[i+1];
   d[2] = values[i+2];
   list.add(d);
}