[JAVA]Probleme mit Variablen über geben

//Dieser teil sool nach dem login aktuallisiert werden.
if(login.isStateloggedin() == true){
				waslogged = new JLabel(login.getuser);//Dass lädt er nichts raus.
				clientPanel.add(waslogged);
			}else{
				button_Register = new JButton("Registrieren");
				button_Register.addActionListener(new regibutten());
				button_Login = new JButton("Login");
				button_Login.addActionListener(new logibutton());
				button_SendMessage.setEnabled(false);
				textField_ClientMessage.setEditable(false);
				clientPanel.add(button_Register);
				clientPanel.add(button_Login);
			}

package de.chat.gui;


import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.*;
//import com.sun.security.auth.login.*;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;


public class login_gui extends JFrame {


	/**
	 * 
	 */
	private static final long serialVersionUID = 3L;
	public static final JPanel pane = new JPanel();
	public static final JTextField user = new JTextField();
	public static final JTextField pass = new JTextField();
	public static final JButton logon = new JButton();
	public static boolean stateloggedin;
	public static String getuser = null;
	public void LoginClass() {
		this.setTitle("Login Frame");
		this.setLocationRelativeTo(null);
		this.setSize(300, 90);
		this.setResizable(false);
		this.setVisible(true);
		logon.setPreferredSize(new Dimension(90, 50));
		logon.setText("Login");
		user.setPreferredSize(new Dimension(90, 20));
		pass.setPreferredSize(new Dimension(90, 20));
		user.setToolTipText("Username");
		pass.setToolTipText("Password");
		this.add(pane);
		pane.add(user, BorderLayout.WEST);
		pane.add(pass, BorderLayout.WEST);
		pane.add(logon, BorderLayout.CENTER);
		logon.addActionListener(new ActionListener() {
			@SuppressWarnings("unused")
			public void actionPerformed(ActionEvent arg0) {
				try {
				Connection conn;
				String dbuser = "root";
				String dbpassw = "";
				String databaseName = "chat";
				String url = "jdbc:mysql:///"+databaseName;
				Class.forName("com.mysql.jdbc.Driver"); //Very important!
				conn = DriverManager.getConnection(url, dbuser, dbpassw);
				Statement st = conn.createStatement();
				ResultSet res = st.executeQuery("SELECT * FROM accounts WHERE uid='"+user.getText()+"' AND passw='"+pass.getText()+"'");
				if(res.next()) {
					JOptionPane.showMessageDialog(null, "You have Logged in!");
					setStateloggedin(true);
				} else {
					JOptionPane.showMessageDialog(null, "Wrong user/password!");
				}
				} catch(Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
	public static boolean isStateloggedin() {
		return stateloggedin;
	}
	public void setStateloggedin(boolean stateloggedin) {
		login_gui.stateloggedin = stateloggedin;
	}
}

package de.chat.gui;


import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.*;
import de.chat.gui.login_gui;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;


public class regi_gui extends JFrame{


	/**
	 * 
	 */
	login_gui login = new login_gui();
	private static final long serialVersionUID = 2L;
	public static final JPanel pane = new JPanel();
	public static final JTextField user = new JTextField();
	public static final JTextField pass = new JTextField();
	public static final JButton reg = new JButton();
	public void RegisterClass() {
		setTitle("Register Frame");
		setLocationRelativeTo(null);
		setSize(300, 90);
		setResizable(false);
		setVisible(true);
		reg.setPreferredSize(new Dimension(90, 50));
		reg.setText("Register");
		user.setPreferredSize(new Dimension(90, 20));
		pass.setPreferredSize(new Dimension(90, 20));
		user.setToolTipText("Username");
		pass.setToolTipText("Password");
		this.add(pane);
		pane.add(user, BorderLayout.NORTH);
		pane.add(pass, BorderLayout.NORTH);
		pane.add(reg, BorderLayout.SOUTH);
		reg.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				try {
				Connection conn;
				String dbuser = "root";
				String dbpassw = "";
				String databaseName = "chat";
				String url = "jdbc:mysql:///"+databaseName;
				Class.forName("com.mysql.jdbc.Driver");//Again very important!
				conn = DriverManager.getConnection(url, dbuser, dbpassw);
				Statement st = conn.createStatement();
				ResultSet res = st.executeQuery("SELECT * FROM accounts WHERE uid='"+user.getText()+"'");
				if(res.next()) {
					if(res.getString("uid").equalsIgnoreCase(user.getText())) {
						JOptionPane.showMessageDialog(null, "The username is already registered!");
					}
				} else {
					PreparedStatement resReg = conn.prepareStatement("INSERT INTO accounts (uid, passw) VALUES (?, ?)");
					resReg.setString(1, user.getText());
					resReg.setString(2, pass.getText());
					resReg.executeUpdate();
					JOptionPane.showMessageDialog(null, "Registered Username: " + user.getText());
					login.setStateloggedin(true);
				}
				} catch(Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
	/**
	 * @return the stateloggedin
	 */
	/**
	 * @param stateloggedin the stateloggedin to set
	 */
}