ToolBar in a Java window

===================
JentWindowJava.java
===================

import javax.swing.JFrame;
/**
 *
 * @author Jent Digital Solutions
 * @param
 *
 */
public class JentWindow extends JFrame {

    private static final long serialVersionUID = 6305168658694781802L;

    /**
     *
     * @param JentTitle Defines a window title
     * @param jexit If true, when the X of window is pressed, the window closes
     * @param jwidth Defines the window width
     * @param jheight Defines the window height
     * @param jresize Defines is the window can be resizable or not
     * @param jmenu Defines is the window have a menu bar or not
     * @param buttonB If the tool bar is closed, if buttonB is true, window also is closed
     */
    public void instWindow(String JentTitle, boolean jexit, int jwidth, int jheight, boolean jresize, boolean jmenu, boolean buttonB){

        if (jexit) {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    //Instantiates a menu bar into the window
    if (jmenu) {
    JentMenuBar menuBar = new JentMenuBar(); //Instantiates an object to make menu works
    menuBar.JentConfigureMenuBar(true, true, true); //Calls method that pass two arguments: file menu and edit menu.
    setJMenuBar(menuBar); //Configures menu bar
    }

    //Instantiates a button bar (tool bar) into the window
    if (buttonB){
        JentButtonBar buttonBar = new JentButtonBar();
        buttonBar.instButtonBar(false);
        }

    setTitle(JentTitle);
    setSize(jwidth, jheight);
    setVisible(true);
    setLocationRelativeTo(null); //center the window at the screen
    setResizable(jresize); //Don't resize
    setLayout(null); ///Don't uses layout
    }


}

==================
JentButtonBar.java
==================

import java.awt.BorderLayout;
import java.awt.Container;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JToolBar;

public class JentButtonBar extends JFrame {

    private static final long serialVersionUID = 1L;

    JToolBar jent_toolbar = new JToolBar();

    public JentButtonBar(){
        super("TOOLBAR");
    }

    /**
     * This class instantiates a Tool Bar on the window
     * If jexitonclose, the bar closes when X is pressed
     */
    public void instButtonBar(boolean jexitonclose){

    jent_toolbar.add(new JButton("Abrir"));
    jent_toolbar.add(new JButton("Novo"));
    jent_toolbar.add(new JButton("Salvar"));
    jent_toolbar.add(new JButton("Fechar"));

    Container pane = this.getContentPane();
    //define como layout o layout de borda
    pane.setLayout(new BorderLayout());

    //adiciona o toolbar no topo
    pane.add(BorderLayout.NORTH, jent_toolbar);
    jent_toolbar.setFloatable(false); //Não permite que a barra se mova na janela

    if (jexitonclose){

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    this.setSize(1024, 54);
    this.setResizable(false);
    this.setVisible(true);

    }
}