Java Question java util list

public List<Comprobante.Conceptos.Concepto> getConcepto() {
if (concepto == null) {
concepto = new ArrayList<Comprobante.Conceptos.Concepto>();
}
return this.concepto;
}

public anywheresoftware.b4a.objects.collections.List getItems() {

}

public anywheresoftware.b4a.objects.collections.List getItems() {
anywheresoftware.b4a.objects.collections.List l = new anywheresoftware.b4a.objects.collections.List();
if (concepto == null) {
concepto = new ArrayList<Comprobante.Conceptos.Concepto>();
}
l.setObject((ArrayList)concepto);
return l;
}