如何设置“ JOptionPane.showMessageDialog”的位置

import javax.swing.JDialog;import javax.swing.JPanel;import javax.swing.Jframe;import javax.swing.JLabel;import javax.swing.JButton;public class CustomDialog extends JDialog {    private JPanel myPanel = null;    private JButton yesButton = null;    private JButton noButton = null;    public CustomDialog(Jframe frame, boolean modal, String myMessage) {    super(frame, modal);    myPanel = new JPanel();    getContentPane().add(myPanel);    myPanel.add(new JLabel(myMessage));    yesButton = new JButton("Yes");    myPanel.add(yesButton);    noButton = new JButton("No");    myPanel.add(noButton);    pack();    //setLocationRelativeTo(frame);    setLocation(200, 200); // <--    setVisible(true);    }}