ArrayList<String>.add throws UnsupportedOperationException

Question

I wrote this code:

List<String> doneTiers = new ArrayList<>();
if (ps.getData("achievements.Done") != null) {
    doneTiers = Arrays.asList(ps.getData("achievements.Done").split("/./"));
}
Msg.debug(tier, tier.getName());
doneTiers.add(tier.getName());// dodany
ps.setData("achievements.Done", DataUTIL.format(doneTiers, "/./"));

and I have error in this line doneTiers.add(tier.GetName());

Adam Michalik · Accepted Answer · 2015-11-21 16:51:50Z

3

Arrays.asList() creates a fixed-size list, so once created, you cannot add more elements to it. Since you already initialized doneTiers with new ArrayList<>(), you can use addAll like this:

doneTiers.addAll(Arrays.asList(ps.getData("achievements.Done").split("/./")))

edited Nov 21, 2015 at 16:51

answered Nov 21, 2015 at 16:45

Adam Michalik

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2 Comments

dekros Over a year ago

hmm ah ok but how to create List from splited string? like this? for(String str : ps.getData("achivemenets.Done").split("/./")){ doneTiers.add(str); } ?

Adam Michalik Over a year ago

You're welcome! Little hint: if you like the answer, hit the big tick mark to the left of it to mark it as "accepted".

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