How to Prevent Duplicate Rows in a JTable When Using a Custom Data Model?

Duplicate Values in JTable Rows Resolved

Despite populating the JTable with a custom DataModel, repetitive data persisted in each row. However, upon closer inspection, the data model remained intact.

Investigation and Resolution

The issue stemmed from unintentionally referencing the same row data multiple times. The solution involved ensuring that each row contained a distinct array list.

Sample Code

Here's a complete code sample demonstrating the corrected implementation:

public void populate(Collection c) {
    data.clear();
    for (Item i : c.getItems()) {
        ArrayList<string> row = new ArrayList(); // Create a new array list for each row
        for (Property p : i.getProperties().values()) {
            row.add(p.toString());
        }
        data.add(row);
    }
    fireTableDataChanged();
}</string>

By creating a separate array list for each row, the data model and JTable accurately displayed the intended data.

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