Help JInternalFrame

[Rodrigo Talles]

I need to close my JInternalFrame when a click a button. In my second class.
//my first class

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;


public class Principal extends JFrame {
	private static final long serialVersionUID = 1L;
	private JPanel contentPane;

	
	Login tela=new Login();
	
	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					Principal frame = new Principal();
					frame.setVisible(true);
					
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
	
	public void setSenha(String login, String senha){
		
		System.out.println(login);
		System.out.println(senha);
		
	}
	/**
	 * Create the frame.
	 */
	public Principal() {

		
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 300);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		JMenuBar menuBar = new JMenuBar();
		menuBar.setBounds(0, 0, 97, 21);
		contentPane.add(menuBar);
		
		JMenu mnNewMenu = new JMenu("Principal");
		menuBar.add(mnNewMenu);
		
		
		
		JMenuItem mntmNewMenuItem = new JMenuItem("Login");
		mntmNewMenuItem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {

				contentPane.add(tela);
				tela.setVisible(true);
				
				/*JInternalFrame internalFrame = new JInternalFrame("Login");
				internalFrame.setBounds(70, 50, 330, 184);
				contentPane.add(internalFrame);
				internalFrame.setVisible(true);*/
			}
		});
		mnNewMenu.add(mntmNewMenuItem);
		
		JMenuItem mntmNewMenuItem_1 = new JMenuItem("Cadastro\r\n");
		mntmNewMenuItem_1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				tela.setVisible(false);
				if(tela.passe==false){
					System.out.println("Logue Primeiro");
				}else{System.out.println("Ok Cadastro");};	
				}
		});
		mnNewMenu.add(mntmNewMenuItem_1);
		
		JMenuItem mntmSair = new JMenuItem("Sair");
		mntmSair.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				System.out.println(tela.login);
				System.out.println(tela.senha);
				System.exit(0);
			}
		});
		mnNewMenu.add(mntmSair);
		
		
	}
}

//my second class

import java.awt.EventQueue;

import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.JRootPane;


import java.awt.Color;
import javax.swing.JFrame;


import javax.swing.border.LineBorder;

import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;


public class Login extends JInternalFrame {
	/**
	 * 
	 */
	private static final long serialVersionUID = 4681925295517182120L;
	private JTextField txtLogin;
	private JTextField txtSenha;
	public boolean passe;
	String login, senha;

	

	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					Login frame = new Login();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public Login() {
		setClosable(true);
		setRootPaneCheckingEnabled(false);
		putClientProperty("JInternalFrame.isPalette", Boolean.TRUE);
        getRootPane().setWindowDecorationStyle(JRootPane.NONE);
		setTitle("Login");
		setFrameIcon(null);
		setBorder(new LineBorder(new Color(0, 0, 0)));
		setEnabled(false);
		setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
		setBackground(new Color(240, 240, 240));
		setBounds(10, 32, 414, 219);
		getContentPane().setLayout(null);
		
		JLabel lblTeste = new JLabel("Login");
		lblTeste.setBounds(55, 77, 31, 16);
		getContentPane().add(lblTeste);
		
		txtLogin = new JTextField();
		txtLogin.setBounds(91, 75, 114, 20);
		getContentPane().add(txtLogin);
		txtLogin.setColumns(10);
		
		JLabel lblSenha = new JLabel("Senha");
		lblSenha.setBounds(50, 113, 36, 16);
		getContentPane().add(lblSenha);
		
		txtSenha = new JTextField();
		txtSenha.setBounds(91, 111, 114, 20);
		getContentPane().add(txtSenha);
		txtSenha.setColumns(10);
		
		JButton btnLogar = new JButton("Logar");
		btnLogar.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				passe=true;	
				
				Acesso acesso = new Acesso();
				acesso.Acesso(txtLogin.getText(), txtSenha.getText());
							
				//HERE I NEED CLOSE MY JINTERNALFRAME
			} 
		});
		btnLogar.setBounds(302, 156, 98, 26);
		getContentPane().add(btnLogar);

	}


}