Criar um menu superior com swing

import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;

public class Home {	
	private JFrame window = new JFrame();
	private JMenuBar menuSuperior = new JMenuBar();
	private JMenu cadastrar = new JMenu("cadastrar");
	private JPanel panel = new JPanel();
	private JMenuItem cadastrarCliente = new JMenuItem("Cadastrar Cliente");

	// Constructor
	public Home() {
		this.build();
	}

	// Getters Setters
	public JFrame getWindow() {
		return this.window;
	}

	public JMenu getCadastrar() {
		return this.cadastrar;
	}
	
	public void build() {
		this.getWindow().setTitle("C.O.T.A");
		this.getWindow().setSize(800, 700);
		this.getWindow().setVisible(true);
		this.getWindow().setResizable(false);
		this.getWindow().getContentPane().setLayout(null);
		this.getWindow().setLocation(50,10);
		this.getWindow().setBackground(Color.WHITE);
		this.getWindow().setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		this.getWindow().setJMenuBar(menuSuperior);
		this.getWindow().add(panel);
		this.getWindow().add(cadastrar);
		this.getCadastrar().add(cadastrarCliente);		
	}

}