CODEWITHSUNDEEP
javalistexceptionjavafx
ALSTRA
ALSTRA

Reputation: 661

Java - Error by adding elements into List

I'm getting UnsupportedOperationException when I add an elemnt into my ObservableList<List<String>>.

The code (here I'm trying to add columns in my dynamic tableview):

private ObservableList<List<String>> fnlData; 
.
.
fnlData = FXCollections.observableList(jdata);
.
.
public void addColumn(){
        for (int i = 0; i < fnlData.size(); i++){
            if (fnlData.get(i)!=null && fnlData.get(i).size() > indexC) {
                fnlData.get(i).add(indexC, "");  // <- here occurs the error 
            }
        }
        finalTable.getSelectionModel().clearSelection();
        finalTable.getItems().clear();
        finalTable.getColumns().clear();
        createColumns(clms++);
        finalTable.getItems().addAll(fnlData);
    }

Upvotes: 0

Views: 162

Answers (2)

ALSTRA
ALSTRA

Reputation: 661

Ok, I solved it...

I changed this: 

private List<List<String>> jdata = new LinkedList<>();
String[] splitted;
.
.
splitted=(lines.split(";"));
jdata.add(Arrays.asList(splitted));

into this:

private List<List<String>> jdata = new LinkedList<>();
String[] splitted;
.
.
splitted=(lines.split(";"));
LinkedList ll = new LinkedList(Arrays.asList(splitted));
jdata.add(ll);

Because the inner list (List<String>) of jdata was a ArrayList, but I needed a LinkedList...

Thanks to ljgw

Upvotes: 1

PaperTsar
PaperTsar

Reputation: 989

An implementation of a collection is free to implement as many operations as it pleases, throwing an UnsupportedOperationException if the operation is not implemented. I advise you to check the documentation of the particular collection you are using.

Upvotes: 0

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