public void addFeature(int[] fIdxArray,float[] fValueArray){
  idxList.addAll(Ints.asList(fIdxArray));
  valList.addAll(Floats.asList(fValueArray));
}

public void addFeature ( int [ ] fIdxArray , float [ ] fValueArray ) { idxList . addAll ( Ints . asList ( fIdxArray ) ) ; valList . addAll ( Floats . asList ( fValueArray ) ) ; }
add features by arrays
