historia jednego wątku.. czyli co z zasobami :)

public class startGui extends JFrame()
{
	protected void createGui() // funkcja generuje całą formatkę, brakuje w niej tylko polecenie setVisible(true)
private JFrame getMyself()
	{return this;}
public StartGui() {
	    SwingUtilities.invokeLater(new Runnable() {
	      @Override
	      public void run() {
	    	LoginWindow lw = new LoginWindow(new LoginToApp()); //loginToApp() klasa weryfikująca logowanie, mało ważne :) 
	    	lw.startLogin(getMyself());
	        createGui();
	      }
	    });
	  }
}

public class LoginWindow
{
JFrame frameToOpen;
public void startLogin(JFrame frameToOpenT)
{
	frameToOpen = frameToOpenT;
	SwingUtilities.invokeLater(new Runnable() {
	  @Override
		public void run() {
		    createGui();
		 }
	 });
}
protected void createGui() 
{
(...)
JButton btnLogin = new JButton("Loguj");
	    btnLogin.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				login.setLoginAndPass(txtLogin.getText(),txtPass.getText()); //klasa która weryfikuje poprawność danych- nie istotna z perspektywy pytania
				if(login.login()) frameToOpen.setVisible(true); 
				else System.out.println("Login incomplit");
				
			}
		});
}
}

package guiZabawa;

import javax.swing.JFrame;
import javax.swing.SwingUtilities;


public class StartGui extends JFrame {
	protected void createGui() 
	{
		setDefaultCloseOperation(EXIT_ON_CLOSE);

	    pack();


	    setLocationRelativeTo(null);
	    setSize(800, 600);
	}
	private JFrame getMyself()
	    {return this;}
	
	public StartGui() {
		
	        SwingUtilities.invokeLater(new Runnable() {
	          @Override
	          public void run() {

	        	LgoinWindow lw = new LgoinWindow(); 
	            lw.startLogin(getMyself());
	            createGui();
	          }
	        });
	      }
	
	  public static void main(String[] args) {
		    new StartGui();
		  }
}

package guiZabawa;




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

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class LgoinWindow extends JFrame {

	JFrame frameToOpen;
	
	public JFrame getMyself()
	{
		return this;
	}
	
	public void startLogin(JFrame frameToOpenT)
	{
	    frameToOpen = frameToOpenT;
	    SwingUtilities.invokeLater(new Runnable() {
	      @Override
	        public void run() {
	            createGui();
	         }
	     });
	}
	protected void createGui() 
	{
		
		setTitle("Podaj login i hasło");


	    JPanel outsideLayout = new JPanel();
	    BoxLayout boxlayout = new BoxLayout(outsideLayout, BoxLayout.Y_AXIS);
	    outsideLayout.setLayout(boxlayout);

	JButton btnLogin = new JButton("Loguj");
	btnLogin.addActionListener(new ActionListener() {
		
		@Override
		public void actionPerformed(ActionEvent e) {
			// TODO Auto-generated method stub

			getMyself().dispose();
			frameToOpen.setVisible(true); 
			
			
		}
	});

	
	JButton btnCancel = new JButton("Dispose");
	btnCancel.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
        	getMyself().dispose();
        }
    });
    
    outsideLayout.add(btnCancel);
    outsideLayout.add(btnLogin);
    
    setContentPane(outsideLayout);
    
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    pack();

    setLocationRelativeTo(null);
    setSize(800, 600);
    setVisible(true);
	}
	
}
	

    JButton btnCancel = new JButton("Dispose");
    btnCancel.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            getMyself().dispose();
            frameToOpen.dispose(); // <-------------------------
        }
    });