[Resolvido] serialização de objectos(?)

[cat_fich 0]

Boa tarde. Tenho umas dúvidas num código que escrevi. Supostamente deveria mostrar todos os radio buttons inseridos através do JOptionPane antes de ter sido escrita a palavra Sair. O programa faz isso, mas se o fechar, voltar a executar e escrever Sair na primeira iteração do JOptionPane todos os radio buttons inseridos anteriormente desaparecem. Penso que seja algo a ver com a serialização dos objectos. Se me puderem dizer o que estou a fazer mal agradecia muito. Já tentei descobrir por mim mas não consegui.

Agradeço desde já toda a ajuda que me possam dar

 

Código:

 

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * Escolha_multipla2.java
 *
 * Created on 11/Jun/2010, 17:45:47
 */

package backoffice;

import java.awt.Container;
import java.awt.FlowLayout;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import javax.swing.ButtonGroup;
import javax.swing.JOptionPane;
import javax.swing.JRadioButton;

/**
 *
 * @author
 */
public class Escolha_multipla2 extends javax.swing.JFrame implements Serializable {

    /** Creates new form Escolha_multipla2 */
    public Escolha_multipla2() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();
        jSeparator1 = new javax.swing.JSeparator();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setFont(new java.awt.Font("Tahoma", 1, 14));
        jLabel1.setText("Escolha múltipla");

        jLabel2.setText("Modelo nº");

        jTextField1.setColumns(5);

        jButton1.setText("Adicionar Nova Pergunta");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jButton2.setText("Anterior");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jButton3.setText("Cancelar");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel1)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel2)
                        .addGap(18, 18, 18)
                        .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addComponent(jSeparator1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 389, Short.MAX_VALUE)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jButton1)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jButton2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jButton3)))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 184, Short.MAX_VALUE)
                .addComponent(jSeparator1, javax.swing.GroupLayout.PREFERRED_SIZE, 10, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton1)
                    .addComponent(jButton2)
                    .addComponent(jButton3))
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                        

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        ObjectOutputStream out;
        ObjectInputStream in;
        String resp = "";
        JRadioButton rb1;
        Container c = getContentPane();
        c.setLayout(new FlowLayout());
        ButtonGroup bg = new ButtonGroup();
        ArrayList<JRadioButton> arr = new ArrayList<JRadioButton>();
        int n = 0;

        while (!resp.equals("Sair")) {
            resp = JOptionPane.showInputDialog("Introduza uma hipótese de resposta");
            if (!resp.equals("Sair")) {
                rb1 = new JRadioButton(resp);
                arr.add(rb1);
                n++;
            }
        }

        for (int i = 0; i < n; i++) {
            bg.add(arr.get(i));
            c.add(arr.get(i));
        }

        try {
            out = new ObjectOutputStream(new FileOutputStream(System.getProperty("user.dir") + File.separator + "modelo.dat", true));
            out.writeObject(c);
            out.flush();
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        Container c2 = getContentPane();
        
        try {
            in = new ObjectInputStream(new FileInputStream(System.getProperty("user.dir") + File.separator + "modelo.dat"));
            c2 = (Container) in.readObject();
            in.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }                                        

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        new Criar_modelo().setVisible(true);
        this.setVisible(false);
    }                                        

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        System.exit(0);
    }                                        

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Escolha_multipla2().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JSeparator jSeparator1;
    private javax.swing.JTextField jTextField1;
    // End of variables declaration                   

}

[Giovanni Ritchie 0]

esse código foi gerado pelo netBeans? Diga qual o enunciado do exercicio, talvez seja mais simples p mim explicar como fazer na mão...

Abraço

[cat_fich 0]

Muito obrigado pelo ajuda Giovanni Ritchie mas já consegui solucionar o problema. No entanto tenho outra dúvida exposta neste tópico Clique aqui. Se me puderes ajudar agradeço