list.addall抛出unsupportedoperationexception

String to = "1;2;3";
String cc = "1;2;3";
String[] toSplit = to.split(";");
List<String> list = Arrays.asList(toSplit);
String[] ccSplit = cc.split(";");
List<String> temp = Arrays.asList(ccSplit);
list.addAll(temp);

List<String> list = new ArrayList<>(Arrays.asList(toSplit));