Java Swing - 如何创建JTable时设置列名

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class Main extends JFrame {

  public Main() {
    setSize(600, 300);
    String[] columnNames = { "A", "B", "C" };
    Object[][] data = { { "M", "a", 2 }, { "J", "e", 4 }, { "M", "z", 6 } };

    JTable table = new JTable(data, columnNames);
    JScrollPane tableSP = new JScrollPane(table);

    add(tableSP);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
  }

  public static void main(String[] args) {
    new Main().setVisible(true);

  }
}