Auto adjust the height of rows in a JTable

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The only way to know the row height for sure is to render each cell to determine the rendered height. After your table is populated with data you can do:

private void updateRowHeights()
{
    for (int row = 0; row < table.getRowCount(); row++)
    {
        int rowHeight = table.getRowHeight();

        for (int column = 0; column < table.getColumnCount(); column++)
        {
            Component comp = table.prepareRenderer(table.getCellRenderer(row, column), row, column);
            rowHeight = Math.max(rowHeight, comp.getPreferredSize().height);
        }

        table.setRowHeight(row, rowHeight);
    }
}

If only the first column can contain multiple line you can optimize the above code for that column only.

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