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How do I do that?

To do that, i guess I have to solve the problem with: "incompatible types: Object cannot be converted to List<Object>". How do I solve this?

I thought I can not, thanks. I also think I already build a list with the desired string. That is this, in the [[:


tableData:3 [[2007-01-01, 27.485, 156.93, 0, 1.3170], [2019-05-06, 25.715, 0,...

I am posting what I think is relevant code.
In table class I have :


class Table extends AbstractTableModel {
private List<String> columnHeaders;
private List<Object> tableData;
...