Java Swing - 如何从当前JFrame打开一个新的JFrame

import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Main {
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    JButton button = new JButton("Show Input Dialog Box");
    button.addActionListener(e -> {
      JTextField xField = new JTextField(5);
      JTextField yField = new JTextField(5);
      JPanel myPanel = new JPanel();
      myPanel.add(new JLabel("x:"));
      myPanel.add(xField);
      myPanel.add(Box.createHorizontalStrut(15));
      myPanel.add(new JLabel("y:"));
      myPanel.add(yField);

      int result = JOptionPane.showConfirmDialog(null, myPanel,
          "Please Enter X and Y Values", JOptionPane.OK_CANCEL_OPTION);
      if (result == JOptionPane.OK_OPTION) {
        System.out.println("x value: " + xField.getText());
        System.out.println("y value: " + yField.getText());
      }
    });
    JPanel panel = new JPanel();
    panel.add(button);
    frame.add(panel);
    frame.setSize(400, 400);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
  }
}