Podział JFrame

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;



public class Main extends JFrame{

    public Main()
    {
        initComponents();
    }
    
    public void initComponents()
    {
       this.setTitle("FinanApp");
       this.setSize(700, 500);
       this.setLocationRelativeTo(null);
       this.add(jmb, BorderLayout.NORTH);
      jmb.add(jFile);
        jFile.setMnemonic(KeyEvent.VK_F);
       jmb.add(jEdit);
        jEdit.setMnemonic(KeyEvent.VK_E);
       jmb.add(jTools);
        jTools.setMnemonic(KeyEvent.VK_T);
       jFile.add(jFileNew);
        jFileNew.setMnemonic(KeyEvent.VK_N);
       jFileNew.add(jFileNewAccount);
       jFileNew.add(jFileNewProfile);
       jFile.addSeparator();
       jFile.add(jFileOpen);
        jFileOpen.setMnemonic(KeyEvent.VK_O);
       jFile.add(jFileSave);
        jFileSave.setMnemonic(KeyEvent.VK_S);
       jFile.addSeparator();
       jFile.add(jFileExport);
        jFileExport.setMnemonic(KeyEvent.VK_E);
       jFile.add(jFilePrint);
        jFilePrint.setMnemonic(KeyEvent.VK_P);
       jFile.addSeparator();
       jFile.add(jFileSaveAndExit);
       jFile.add(jFileExit);
        jFileExit.setMnemonic(KeyEvent.VK_X);
       jEdit.add(jEditCut);
        jEditCut.setMnemonic(KeyEvent.VK_T);
       jEdit.add(jEditCopy);
        jEditCopy.setMnemonic(KeyEvent.VK_C);
       jEdit.add(jEditPaste);
        jEditPaste.setMnemonic(KeyEvent.VK_P);
       jEdit.add(jEditUndo);
        jEditUndo.setMnemonic(KeyEvent.VK_U);
       jTools.add(jToolsCalculator);
       jToolsCalculator.add(jToolsCalculatorCredit);
       jToolsCalculator.add(jToolsCalculatorInvest);
       jTools.add(jToolsSummary);
       
       this.add(jPanel);
       jPanel.add(accountList, BorderLayout.CENTER);
        accountList.addActionListener(new ActionListener() {
           @Override
           public void actionPerformed(ActionEvent e) {
               tmp.setText("Account List");
           }
        });
       jPanel.add(accountBills);
        accountBills.addActionListener(new ActionListener() {
           @Override
           public void actionPerformed(ActionEvent e) {
               tmp.setText("Bills");
           }
        });
       jPanel.add(accountCashFlow);
       jPanel.add(categories);
       
       this.add(jPanelView, BorderLayout.SOUTH);
       
       
       jPanelView.add(tmp);
       
       this.setDefaultCloseOperation(EXIT_ON_CLOSE);
       
    }
    
       JMenuBar jmb = new JMenuBar();
       
       JMenu jFile = new JMenu("File");
            
       JMenu jEdit = new JMenu("Edit");
       JMenu jTools = new JMenu("Tools");
       JMenu jFileNew = new JMenu("New");
       JMenu jToolsCalculator = new JMenu("Calculator");
       
       JMenuItem jFileNewAccount = new JMenuItem("New account");
       JMenuItem jFileNewProfile = new JMenuItem("New profile");
       JMenuItem jFileOpen = new JMenuItem("Open");
       JMenuItem jFileSave = new JMenuItem("Save");
       JMenuItem jFileExport = new JMenuItem("Export");
       JMenuItem jFilePrint = new JMenuItem("Print");
       JMenuItem jFileSaveAndExit = new JMenuItem("Save & Exit");
       JMenuItem jFileExit = new JMenuItem("Exit");
       JMenuItem jEditCut = new JMenuItem("Cut");
       JMenuItem jEditCopy = new JMenuItem("Copy");
       JMenuItem jEditPaste = new JMenuItem("Paste");
       JMenuItem jEditUndo = new JMenuItem("Undo");
       JMenuItem jToolsSummary = new JMenuItem("Summary");
       JMenuItem jToolsCalculatorCredit = new JMenuItem("Credit");
       JMenuItem jToolsCalculatorInvest = new JMenuItem("Investing");
       
       JPanel jPanel = new JPanel();
       JButton accountList = new JButton("Account List");
       JButton accountBills = new JButton("Bills");
       JButton accountCashFlow = new JButton("Cash Flow");
       JButton categories = new JButton("Categories");
       
       JPanel jPanelView = new JPanel();
       JLabel tmp = new JLabel("Bla bla");
    
    public static void main(String[] args) {
        new Main().setVisible(true);
      }
}