Adicionando JPanel a uma area?

Assuntos Gerais
#1

Salve galera…Estou tentando add um JPanel a uma área de um JFrame mas não estou conseguindo, esse JPanel eh para ser adicionado com um evento de click num JMenuItem.

to tentando assim

//classe extend JPanel
public class DesktopArea extends JPanel{
    private static int deskCount;
    
    public DesktopArea(){    
        JLabel label = new JLabel("" + deskCount);
        label.setForeground(Color.WHITE);
        this.add(label);
        this.setBackground(Color.BLACK);
        this.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
        deskCount++;
    }
    
    public Integer getDeskCount(){
        return this.deskCount;
    }
}


// JFrame, metodo de inicializacao no JFrame
public class FramePrincipal extends JFrame{
     public FramePrincipal(){
           begin();
     }
}

 public void begin(){
        DesktopArea deskArea = new DesktopArea();
        this.setExtendedState(MAXIMIZED_BOTH);
        this.setLayout(new BorderLayout());       
        
        this.add(panelNorth, BorderLayout.NORTH);
        this.getContentPane().add(deskArea, BorderLayout.CENTER);  //aqui funciona a primeira vez, qdo coloco esse metodo no construtor do JFrame
        this.add(panelSouth, BorderLayout.SOUTH);
        this.setTitle("Project" + deskArea.getDeskCount());
    }


//aqui onde eu tento adicionar novamente o JPanel ao JFrame FramePrincipal
private void fileNewActionPerformed(java.awt.event.ActionEvent evt) {
    DesktopArea deskArea = new DesktopArea();
    this.getContentPane().add(deskArea, BorderLayout.CENTER); //aqui onde tento add o JPanel
    this.setTitle("Project" + deskArea.getDeskCount());
    this.getContentPane().repaint();
}

Como resolver isso ???

obrigado

#2

Eu nao entendi muito bem onde vc colocou esse teu FileNew event, ligado a que ele estah,
mas criei um menu, atrelei ele a um evento action.

Criei o evento action e beleza, o panel foi instanciado.

Vê se te ajuda em algo:

[code]

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class FramePrincipal extends JFrame {

JPanel panelNorth = new JPanel();
JPanel panelSouth = new JPanel();

public FramePrincipal() {
    begin();
}

public void begin() {
    
    jMenuBar1 = new javax.swing.JMenuBar();
    jMenu1 = new javax.swing.JMenu();
    jMenuItem1 = new javax.swing.JMenuItem(); 
    jMenu1.setText("File");

    jMenuItem1.setText("jMenuItem1");
    jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jMenuItem1ActionPerformed(evt);
        }
    });
    jMenu1.add(jMenuItem1);
    jMenuBar1.add(jMenu1);
    
    setJMenuBar(jMenuBar1);
    
    DesktopArea deskArea = new DesktopArea();
    this.setExtendedState(MAXIMIZED_BOTH);
    this.setLayout(new BorderLayout());

    this.add(panelNorth, BorderLayout.NORTH);
    this.getContentPane().add(deskArea, BorderLayout.CENTER);  //aqui funciona a primeira vez, qdo coloco esse metodo no construtor do JFrame   
    this.add(panelSouth, BorderLayout.SOUTH);
    this.setTitle("Project" + deskArea.getDeskCount());
}

//aqui onde eu tento adicionar novamente o JPanel ao JFrame FramePrincipal
private void fileNewActionPerformed(java.awt.event.ActionEvent evt) {
DesktopArea deskArea = new DesktopArea();
this.getContentPane().add(deskArea, BorderLayout.CENTER); //aqui onde tento add o JPanel
this.setTitle(“Project” + deskArea.getDeskCount());
this.getContentPane().repaint();
}

private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {       
    DesktopArea deskArea = new DesktopArea();
    this.getContentPane().add(deskArea, BorderLayout.CENTER); //aqui onde tento add o JPanel   
    this.setTitle("Project" + deskArea.getDeskCount());
    this.getContentPane().repaint();
}

private javax.swing.JMenu jMenu1;
private javax.swing.JMenu jMenu2;
private javax.swing.JMenu jMenu3;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem jMenuItem1;

public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {

        public void run() {
            new FramePrincipal().setVisible(true);
        }
    });
}

}[/code]

#3