private String[] zahlen ={"1", "2", "3", "4"};
private String[] buchstaben ={"a","b","c", "d"};
private List<String[]> zahlenUndBuchstaben = Arrays.asList(zahlen, buchstaben);
private String[] zahlen ={"1", "2", "3", "4"};
privateString[] buchstaben ={"a","b","c", "d"};
private List<String> zahlenUndBuchstaben = new ArrayList<>();
zahlenUndBuchstaben.addAll(Arrays.asList(zahlen, buchstaben);