AYUDA FLOWLAYOUT

[YamiKuro]

Lo k pasa es k tengo que agregar 3 botones en SOUTH usando FlowLayout y BorderLayout... pero me lanza este error:

----jGRASP exec: java BorderTest

Exception in thread "main" java.lang.NullPointerException
   at java.awt.Container.addImpl(Container.java:1045)
   at java.awt.Container.add(Container.java:927)
   at BorderTest.<init>(BorderTest.java:120)
   at BorderTest.main(BorderTest.java:40)

----jGRASP wedge2: exit code for process is 1.
----jGRASP: operation complete.

Osea si compila pero al correrlo me lanza el error anterior..
MI CODIGO:

Código [Seleccionar] Expandir

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

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;

import javax.swing.BoxLayout;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.WindowConstants;



public class BorderTest extends JFrame
{ 
//-----------------
    private static final long serialVersionUID = -5807365968277501395L;
    private JPanel pnorte;
    private JPanel psur;
    private JPanel poeste;
    private JPanel peste;



//------------------


    public static void main(String[] args)
  {
          BorderTest prueba=new BorderTest();
//----
 
        JFrame window = new BorderTest();
        window.setVisible(true);
    }


     public void visualizaVentana()
    {
        JFrame v = new JFrame("Prueba BorderLayout");
        construyeTodo(v.getContentPane());
        v.pack();
        v.setVisible(true);
        v.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }


     public void start()
    {
        construyeTodo(this);
    }

//---------------------------------------

   private void construyeTodo(Container contenedor)
    {
        construyepsur();
  //      construyepoeste();
        construyepeste();
//---------------------------------------------
        JScrollPane scroll = new JScrollPane(new JTextArea());
        contenedor.setLayout(new BorderLayout());


//----
        contenedor.add(scroll, BorderLayout.CENTER);
        contenedor.add(pnorte, BorderLayout.NORTH);
        contenedor.add(psur, BorderLayout.SOUTH);
        contenedor.add(poeste, BorderLayout.WEST);
        contenedor.add(peste, BorderLayout.EAST);
}

//-------
    private void construyepsur()
    {
        psur = new JPanel(new FlowLayout(FlowLayout.CENTER));
        psur.setBackground(Color.cyan);
        psur.add(new JButton("Probar"));
        psur.add(new JButton("Insertar Serie"));
        psur.add(new JButton("Salir"));
    }
//----------------------
    private void construyepeste()
    {
        peste = new JPanel(new FlowLayout());
        peste.setBackground(Color.yellow);
        peste.add(new JTextField(25));
  peste.add(new JTextField(25));
        peste.add(new JTextField(25));
    }






    BorderTest() {

        JLabel etiquetaN  = new JLabel("Nombre: El Mio");
        JButton east   = new JButton("Easgggggggggggggggggggggggggggggggggggggggggt");
        JButton south   = new JButton("West");
  JButton west   = new JButton("south");


        JPanel content = new JPanel();
        content.setLayout(new BorderLayout());

        content.add(etiquetaN , BorderLayout.NORTH);
        content.add(east  , BorderLayout.EAST);
  content.add(psur , BorderLayout.SOUTH);
        content.add(west  , BorderLayout.WEST);


        setContentPane(content);
        setTitle("BorderTest");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
    }
}


[Leyer]

No estas inicializando psur en el constructor

Un Saludo.