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Java Swing - 如何专注于JDialog中的JTextField

jdialog 【jdialog】
我们想知道如何专注于JDialog中的JTextField。
代码展示 运行结果 
import java.awt.Dimension;
import java.awt.event.ActionEvent;

import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Main extends JFrame {
  static JFrame myFrame;

  public Main() {
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    JButton openDialog = new JButton("Click here");
    JPanel myPanel = new JPanel();
    myPanel.add(new JButton(new AbstractAction("Click here") {
      @Override
      public void actionPerformed(ActionEvent e) {
        JDialog dialog = new JDialog(myFrame, true);
        JTextField myField = new JTextField(10);
        JPanel innerPanel = new JPanel();
        innerPanel.add(myField);
        dialog.add(innerPanel);
        dialog.pack();
        dialog.setSize(new Dimension(160, 120));
        dialog.setLocationRelativeTo(myFrame);
        dialog.setVisible(true);
      }
    }));
    add(myPanel);
    pack();
    setSize(new Dimension(320, 240));
    setLocationRelativeTo(null);
    setVisible(true);
  }

  public static void main(String[] args) {
    myFrame = new Main();
  }
}