Как добавить Gui форму на другую?

public Person(String id,String name,String surname,String tel)
{  //removed  code with initialization
    JLabel[] labels={new JLabel("Id", JLabel.RIGHT),new JLabel("Name", JLabel.RIGHT),new JLabel("Surname", JLabel.RIGHT),new JLabel("Tel", JLabel.RIGHT)};
    JTextField[] textFields=new JTextField[labels.length];
    JPanel container=new JPanel();
    container.setLayout(new BorderLayout());
    JPanel labelPanel = new JPanel(new GridLayout(labels.length, 1));
    JPanel fieldPanel = new JPanel(new GridLayout(labels.length, 1));
    container.add(labelPanel, BorderLayout.WEST);
    container.add(fieldPanel, BorderLayout.CENTER);
 
    for(int i=0;i<labels.length;i++)
    {
 
        textFields[i]=new JTextField(info[i],30);
        labels[i].setLabelFor(textFields[i]);
        labelPanel.add(labels[i]);
        JPanel p = new JPanel(new FlowLayout(FlowLayout.LEFT));
        p.add(textFields[i]);
        fieldPanel.add(p);
    }
 
    setSize(450,220);
    JPanel wrapper=new JPanel(new GridLayout());
    wrapper.add(container,new GridBagConstraints());
    addToCenter(wrapper);

public abstract class ClubAbstractEntity extends JFrame{
//removed  code with initialization
public ClubAbstractEntity()
{
    JFrame frame= new JFrame();
    frame.setTitle("Club's Data");
 
    handler=new ButtonsHandler();
    mainPanel=new JPanel();
    mainPanel.setSize(450,220);
    mainPanel.setLayout(new GridLayout());
    okButton=new JButton("OK");
    okButton.addActionListener(handler);
    cancelButton=new JButton("CANCEL");
   cancelButton.addActionListener(handler);
    mainPanel.add(okButton);
    mainPanel.add(cancelButton);
}
protected void addToCenter(Component guiComponent)
{
    add(guiComponent,BorderLayout.CENTER);
}

import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
 
public class Window extends JFrame {
    private JPanel main = new JPanel();
    private JPanel leftPanel = new JPanel(new GridLayout(4, 1, 5, 5));
    private JPanel centerPanel = new JPanel(new GridLayout(4, 1, 5, 5));
    private JPanel bottomPanel = new JPanel();
    private JTextField txt1 = new JTextField();
    private JTextField txt2 = new JTextField();
    private JTextField txt3 = new JTextField();
    private JTextField txt4 = new JTextField();
    private JButton btnOk = new JButton("OK");
    private JButton btnCancel = new JButton("Cancel");
    
    public Window() {
        super.setTitle("Window");
        this.setSize(400, 200);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setLocationRelativeTo(null);
        
        main.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));
        main.setLayout(new BorderLayout(5, 5));
        
        leftPanel.add(new JLabel("Id", JLabel.RIGHT));
        leftPanel.add(new JLabel("Name", JLabel.RIGHT));
        leftPanel.add(new JLabel("Surname", JLabel.RIGHT));
        leftPanel.add(new JLabel("Tel", JLabel.RIGHT));
        
        centerPanel.add(txt1);
        centerPanel.add(txt2);
        centerPanel.add(txt3);
        centerPanel.add(txt4);
        
        bottomPanel.add(btnOk);
        bottomPanel.add(btnCancel);
        
        main.add(leftPanel, BorderLayout.WEST);
        main.add(centerPanel, BorderLayout.CENTER);
        main.add(bottomPanel, BorderLayout.SOUTH);
                
        this.getContentPane().add(main);
        this.setVisible(true);
    }
 
    public static void main(final String[] args) {
        new Window();
    }
}