How to pass values ​​between classes?

Question

Java

Hello! Please tell me how to display the value of the JTextField sNameUser of the MainPage.java class in the JLabel exampleLable of the DebriefingPage class when clicking on the JButton button
MainPage.java

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import java.awt.Color;
import java.awt.Dimension;

import javax.swing.UIManager;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import java.awt.Font;
import java.awt.Toolkit;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.ImageIcon;
import javax.swing.SwingConstants;
import java.awt.GridLayout;
import java.awt.FlowLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.LayoutStyle.ComponentPlacement;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import com.jgoodies.forms.layout.FormLayout;
import com.jgoodies.forms.layout.ColumnSpec;
import com.jgoodies.forms.layout.RowSpec;
import com.jgoodies.forms.layout.FormSpecs;

public class MainPage extends JFrame {

  private JPanel contentPane;
  
  private JTextField sNameUser;
  private JTextField nameUser;
  private JTextField pUser;
  

  /**
   * Launch the application.
   */
  public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
      public void run() {
        try {
          MainPage frame = new MainPage();
          
          frame.setUndecorated(true);
          frame.setVisible(true);
        } catch (Exception e) {
          e.printStackTrace();
        }
      }
    });
  }

  /**
   * Create the frame.
   */
  public MainPage() {
    setResizable(false);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 600, 400);
    
    sNameUser = new JTextField();
    sNameUser.setBounds(32, 123, 180, 31);
    sNameUser.setColumns(10);
    
    JButton button = new JButton("\u0417\u0430\u0440\u0435\u0433\u0438\u0441\u0442\u0440\u0438\u0440\u043E\u0432\u0430\u0442\u044C\u0441\u044F");
    button.setBounds(80, 299, 132, 32);
    button.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent arg0) {
        DebriefingPage dP = new DebriefingPage();

        boolean succRegistration = false;
        if(sNameUser.getText().trim().length() > 0) {
          succRegistration = true;

        } else {
          JOptionPane.showMessageDialog(null,
                "Вы не ввели фамилию",
                "Inane error",
                JOptionPane.ERROR_MESSAGE);
          succRegistration = false;
        }
      }
    });
  }
}

DebriefingPage

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Toolkit;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;

public class DebriefingPage extends JFrame {

  private JPanel contentPane;

  /**
   * Launch the application.
   */
  public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
      public void run() {
        try {
          DebriefingPage frame = new DebriefingPage();
          frame.dispose();
          frame.setUndecorated(true);
          frame.setVisible(true);
        } catch (Exception e) {
          e.printStackTrace();
        }
      }
    });
  }

  /**
   * Create the frame.
   */
  public DebriefingPage() {
    setResizable(false);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 600, 400);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    contentPane.setLayout(null);
    
    
    JLabel exampleLable = new JLabel("sd");
    panel_1.add(exampleLabel);

    
  }

}