Add a column without affecting existing columns

    

import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;

public class Main {
  public static void main(String[] argv) throws Exception {
    DefaultTableModel model = new DefaultTableModel();
    JTable table = new JTable(model);

    model = (DefaultTableModel) table.getModel();
    TableColumn col = new TableColumn(model.getColumnCount());

    // Ensure that auto-create is off
    if (table.getAutoCreateColumnsFromModel()) {
      throw new IllegalStateException();
    }
    col.setHeaderValue("Col3");
    table.addColumn(col);
    model.addColumn("Col3",  new Object[] { "v3" });

  }
}

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Add a column without affecting existing columns : Table Model « Swing JFC « Java

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