Why Are My JTable Rows Duplicating, and How Can I Fix It Using `fireTableStructureChanged()`?

JTable Row Duplicates: Addressing the Root Cause

In this case, the issue with duplicate values in the JTable row stems from an incorrect implementation of the fireTableDataChanged() method within the custom CollectionDataModel.

Correct Implementation of fireTableDataChanged()

The fireTableDataChanged() method should notify the JTable that the underlying data has changed, triggering the update of the table's display. In the provided code snippet, the method does not appear to be implemented.

To implement it correctly, add the following code to the end of the populate() method:

fireTableStructureChanged();

Explanation

The fireTableStructureChanged() method indicates that the structure of the data, such as the number of columns or rows, has changed. This triggers the table to rebuild its columns and rows correctly.

Example Code

Here is the corrected code with the fireTableStructureChanged() method implemented:

public void populate(Collection c) {
    data.clear();
    for(Item i : c.getItems()) {
        ArrayList<String> row = new ArrayList<String>();
        for(Property p : i.getProperties().values()) {
            row.add(p.toString());
        }
        data.add(row);
    }
    fireTableStructureChanged();
}

By correctly implementing the fireTableStructureChanged() method, the table will be updated correctly when new data is populated, preventing the appearance of duplicate rows.

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