问如何在单击按钮后从向量将数据更新为JTable

EN

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.util.Vector;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

import mygui.MainParent;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class Test {
    Vector<String> row;
    DefaultTableModel DFMO;
    Vector<Vector> rowData;
    JFrame frame;
    private int count = 0;
    public static void main(String arg[]){
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Test window = new Test();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });

    }
public Test() {
    frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JButton mybtn = new JButton("Click Me");
    frame.getContentPane().add(mybtn, BorderLayout.SOUTH);

    row = new Vector<String>();
    rowData = new Vector<Vector>();

    Vector<String> columnNames = new Vector<String>();
    columnNames.addElement("Column One");
    columnNames.addElement("Column Two");
    columnNames.addElement("Column Three");

    DFMO = new DefaultTableModel(rowData, columnNames);
    JTable table = new JTable(DFMO);
    JScrollPane scrollPane = new JScrollPane(table);
    frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);

    mybtn.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            datachange();
        }
    });

    datachange();

  }
  public void datachange(){
      count++;
      row.addElement("Row"+count+"-Column1");
      row.addElement("Row"+count+"-Column2");
      row.addElement("Row"+count+"-Column3");
      rowData.addElement(row);
      DFMO.fireTableDataChanged();
  }
}