Problema resolvido ;d

public Teste(){

    super();

    Container tela = this.getContentPane();
    tela.setBackground(Color.GREEN);

    painel = new JTable();
    painel.setLayout(null);
    painel.setBackground(Color.white);
    painel.setBounds(20,100,500,500);
    Border borda = BorderFactory.createEtchedBorder();
        painel.setBorder(BorderFactory.createTitledBorder(borda, "543"));


    a = new JLabel("teste");
    a.setBounds(100,200,100,20);
    b = new JLabel("teste");
    b.setBounds(100,300,100,20);
    c = new JLabel("teste");
    c.setBounds(100,320,100,20);
    d = new JLabel("teste");
    d.setBounds(100,850,100,20);

   
    JButton button = new JButton("teste");
    button.setBackground(Color.pink);
    button.setBounds(10,100,200,20);

    JButton button1 = new JButton("sdfsfd");
    button1.setBackground(Color.red);
    button1.setBounds(100,200,10,50);

    x = new JScrollPane();
    x.setViewportView(painel);
   
    x.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    x.setLayout(null);
   
        painel.add(a);
        painel.add(b);
        painel.add(c);
        painel.add(d);
        painel.add(button);
        //tela.add(x);
        tela.add(painel);

        this.setLayout(null);
        this.setLocationRelativeTo(null);
        this.setResizable(true);
        this.setExtendedState(JFrame.MAXIMIZED_BOTH);
        this.setVisible(true);


    }