Как передать значения между классами?

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;
				}
			}
		});
	}
}

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);

		
	}

}