JFrame, isn't visible sometimes..

[AndroidAppNewbie]

Hi.
When i start my application, sometimes i get a blank, Jframe(It's supposed to have black background) and when i press my start button, the game dosen't start, and sometimes it works perfectly. The console dosen't say any errors, so i'll post the code of all frames that's included.

Starter class, the Frame for the game.

public class Starter extends JFrame{

public static void main(String[]args){
    new Starter();
}

public Starter(){
        super("The Cube");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
        setLocation(750, 250);
        setResizable(false);
        setSize(600, 400);
        Cube cu = new Cube();
        addKeyListener(cu);
        add(cu);
    }

Cube class, the class with the game.

public class Cube extends JPanel implements ActionListener,KeyListener{

    public Cube(){
        setVisible(true);
        setSize(600, 400);
        setBackground(Color.BLACK);
        setLocation(750, 250);
        addKeyListener(this);
        player = new Starter(20, 330);
////////////////////////////////////////////////////////////////        
        lvl1part1 = new Starter(0, 200);
        lvl1part2 = new Starter(230, 200);
        lvl1win = new Starter(150, 0);
////////////////////////////////////////////////////////////////
        begin = new Timer(5, this);
        begin.start();
        new Menu();
    }

The menu , it shows up next to the game frame. The Menu class is inside the Cube class.

class Menu extends JFrame implements ActionListener{

    private JButton level1;
    private JButton level2;
    
public Menu(){
    super("Menu");
    setVisible(true);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setSize(300, 300);
    setLayout(null);
    setResizable(false);
    setLocation(450, 250);
    level1 = new JButton("Level 1");
    level1.addActionListener(this);
    level1.setBounds(0, 80, 100 ,50);
    add(level1);
    
    level2 = new JButton("Level 2");
    level2.addActionListener(this);
    if(!lvl1done){
    level2.setEnabled(false);
    } else if(lvl1done){
        level2.setEnabled(true);
    }
    level2.setBounds(101, 80, 100 ,50);
    add(level2);
}

[Fubarable]

It's the order of things that matter here: First add your components to the JFrame, then call setVisible(true). You'll also want to learn how to use layout managers and pack to full advantage.

[AndroidAppNewbie]

It's the order of things that matter here: First add your components to the JFrame, then call setVisible(true). You'll also want to learn how to use layout managers and pack to full advantage.

Hey thanks, it worked by changing in positions of setVisible and components, thanks. I'll change the thread to solved.

EDIT: I can't seem to find the [SOLVED] switch..so i'll simply say it here. [SOLVED]..
EDIT2: Nvm