Variables et Classes

**barney_vegeta** · 06/05/2012, 07h58

Bonjour,

J'ai un package qui contient plusieurs classes, et j'aimerais utiliser une variable de la classe 1 dans la classe 2....quelqu'un a une idée ??

**paissad** · 06/05/2012, 09h37

Bonjour,
est ce que tu pourrais montrer ce que tu es entrain de faire ?

Cela dit, ta question relève d'un niveau débutant, et normalement si tu lis bien un cours, juste un début de cours, tu surmonteras ce genre de blocages

Fais un tour ici http://java.developpez.com/cours/
Cordialement.

**barney_vegeta** · 06/05/2012, 10h59

Oui, j'avoue que je suis débutant

sinon, j'ai trouvé la solution pour ça, mais j'ai un autre problème.....

pour vous expliquez de quoi il s'agit, la classe 1 est une fenêtre JDialog qui reçoit des données entrées par un utilisateur et fait des opérations sur ces données afin de calculer une certaine matrice, et c'est cette matrice que je veux récupérer dans la classe 2 afin de l'afficher dans une JFrame.....le problème c'est que les coefficients de cette matrice sont à priori des pointeurs "null", du coup c'est impossible d'afficher ma JFrame et j'obtient une erreur "Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException"...sachant que cette matrice se calcule après que l'utilisateur entre ses données et confirme dans la JDialog de la classe 1.

J'éspére que j'ai bien expliqué !!

**paissad** · 06/05/2012, 12h04

Faut que tu montres du code et l'exception complète. Sinon c'est impossible de t'aider, c'est la meilleure façon d'être vraiment clair

**barney_vegeta** · 07/05/2012, 00h49

d'accord

voilà le code de la première classe

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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public class dialog_gauss extends javax.swing.JDialog {
 
    /**
     * Creates new form dialog_gauss
     */
    public dialog_gauss(java.awt.Frame parent, boolean modal) {
        super(parent, modal);
        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();
        jTextField1 = new javax.swing.JTextField();
        jTextField2 = new javax.swing.JTextField();
        jTextField3 = new javax.swing.JTextField();
        jTextField4 = new javax.swing.JTextField();
        jTextField5 = new javax.swing.JTextField();
        jTextField6 = new javax.swing.JTextField();
        jTextField7 = new javax.swing.JTextField();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jLabel5 = new javax.swing.JLabel();
        jLabel6 = new javax.swing.JLabel();
        jLabel7 = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
 
        jLabel1.setText("veuillez saisir les parmètres de la loi gauss:");
 
        jTextField7.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField7ActionPerformed(evt);
            }
        });
 
        jLabel2.setText("Seuil:");
 
        jLabel3.setText("M1:");
 
        jLabel4.setText("M2:");
 
        jLabel5.setText("Moyenne:");
 
        jLabel6.setText("Ecarttype");
 
        jLabel7.setText("Nbpoints:");
 
        jButton1.setText("Quitter");
        jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton1MouseClicked(evt);
            }
        });
 
        jButton2.setText("Suivant>");
        jButton2.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton2MouseClicked(evt);
            }
        });
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });
 
        jButton3.setText("Résultat");
        jButton3.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton3MouseClicked(evt);
            }
        });
        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(29, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 324, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel4)
                            .addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 43, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addGroup(layout.createSequentialGroup()
                                        .addGap(12, 12, 12)
                                        .addComponent(jLabel5))
                                    .addGroup(layout.createSequentialGroup()
                                        .addGap(168, 168, 168)
                                        .addComponent(jButton2)
                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                        .addComponent(jButton1)))
                                .addContainerGap())
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addGroup(layout.createSequentialGroup()
                                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                            .addGroup(layout.createSequentialGroup()
                                                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
                                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                                                    .addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, 76, javax.swing.GroupLayout.PREFERRED_SIZE)
                                                    .addGroup(layout.createSequentialGroup()
                                                        .addComponent(jTextField3, javax.swing.GroupLayout.DEFAULT_SIZE, 73, Short.MAX_VALUE)
                                                        .addGap(9, 9, 9))))
                                            .addGroup(layout.createSequentialGroup()
                                                .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 76, javax.swing.GroupLayout.PREFERRED_SIZE)
                                                .addGap(18, 18, 18)
                                                .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, 76, javax.swing.GroupLayout.PREFERRED_SIZE)))
                                        .addGap(18, 18, 18)
                                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                                            .addComponent(jLabel7)
                                            .addComponent(jTextField5, javax.swing.GroupLayout.DEFAULT_SIZE, 76, Short.MAX_VALUE)
                                            .addComponent(jTextField6)))
                                    .addGroup(layout.createSequentialGroup()
                                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                                            .addComponent(jButton3)
                                            .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 113, javax.swing.GroupLayout.PREFERRED_SIZE))
                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                        .addComponent(jTextField7, javax.swing.GroupLayout.PREFERRED_SIZE, 132, javax.swing.GroupLayout.PREFERRED_SIZE)))
                                .addGap(36, 36, 36))))))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addGap(31, 31, 31)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel5)
                    .addComponent(jLabel6)
                    .addComponent(jLabel7))
                .addGap(10, 10, 10)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel3)
                    .addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(29, 29, 29)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel4)
                    .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(40, 40, 40)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jTextField7, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel2))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 28, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton1)
                    .addComponent(jButton2)
                    .addComponent(jButton3)))
        );
 
        pack();
    }// </editor-fold>                        
 
    private void jTextField7ActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // TODO add your handling code here:
    }                                           
 
    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
    }                                        
 
    private void jButton2MouseClicked(java.awt.event.MouseEvent evt) {                                      
        // TODO add your handling code here:
       String Moy1 , Moy2 , ecarty1, ecarty2, npointlignecolonne1, npointlignecolonne2, Seuil;
                int nbpoints_g1, nbpoints_g2;
                Moy1 = jTextField1.getText();
                Moy2= jTextField2.getText();
                ecarty1 = jTextField3.getText();
                ecarty2 = jTextField4.getText();
                npointlignecolonne1= jTextField5.getText();
                npointlignecolonne2 = jTextField6.getText();
                Seuil = jTextField7.getText();
                //Convertion en int
                nbpoints_g1= Integer.parseInt(npointlignecolonne1);
                nbpoints_g2 = Integer.parseInt(  npointlignecolonne2);
                //convertion en double
                double  moy1,  moy2, ecartype1, ecartype2, seuil;
                 moy1 = Double.parseDouble(Moy1 );
                 moy2= Double.parseDouble(Moy2);
                ecartype1 = Double.parseDouble(ecarty1);
                ecartype2= Double.parseDouble(ecarty2);
                seuil= Double.parseDouble(Seuil);
                // convertion en double qui manque
 
                Matrice_gauss rr = new Matrice_gauss( nbpoints_g1,  nbpoints_g1, moy1, ecartype1 );
                Matrice_gauss tt = new Matrice_gauss(nbpoints_g2, nbpoints_g2, moy2,  ecartype2);
 
 
                int iterationA = 0;
 
                for (int co = 0; co <= nbpoints_g1 - 1; co++) {
                    for (int con = 0; con <= nbpoints_g1 - 1; con++) {
                        if (rr.donnees[co][con] < seuil) {
                            iterationA++;
                        }
                    }
                }
                int iterationB = 0;
                for (int co = 0; co <= nbpoints_g2 - 1; co++) {
                    for (int con = 0; con <= nbpoints_g2 - 1; con++) {
                        if (tt.donnees[co][con] > seuil) {
                            iterationB++;
                        }
                    }
                }
 
 
                double[][] élémentsConfusion = {{iterationA, nbpoints_g1 * nbpoints_g1 - iterationA}, {nbpoints_g2 * nbpoints_g2 - iterationB, iterationB}};
 
                Matrice_gauss Confusion = new Matrice_gauss(élémentsConfusion);
                Confusion.afficherMatrice(Confusion);
 
 
 
 
 
 
 
 
 
 
 
 
    }                                     
 
    private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {                                      
        // TODO add your handling code here:
        System.exit(0);
    }                                     
 
    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
    }                                        
 
    private void jButton3MouseClicked(java.awt.event.MouseEvent evt) {                                      
        // TODO add your handling code here:
        Affichage1 ff=new Affichage1();
        ff.setVisible(true);
 
        this.dispose();
    }                                     
 
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /*
         * Set the Nimbus look and feel
         */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /*
         * If Nimbus (introduced in Java SE 6) is not available, stay with the
         * default look and feel. For details see
         * http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(dialog_gauss.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(dialog_gauss.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(dialog_gauss.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(dialog_gauss.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
 
        /*
         * Create and display the dialog
         */
        java.awt.EventQueue.invokeLater(new Runnable() {
 
            public void run() {
                dialog_gauss dialog = new dialog_gauss(new javax.swing.JFrame(), true);
                dialog.addWindowListener(new java.awt.event.WindowAdapter() {
 
                    @Override
                    public void windowClosing(java.awt.event.WindowEvent e) {
                        System.exit(0);
                    }
                });
                dialog.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.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JLabel jLabel7;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField2;
    private javax.swing.JTextField jTextField3;
    private javax.swing.JTextField jTextField4;
    private javax.swing.JTextField jTextField5;
    private javax.swing.JTextField jTextField6;
    private javax.swing.JTextField jTextField7;
    // End of variables declaration                   
}

et tout ce que je veut récupérer de cette classe c'est la matrice "élémentsConfusion"

La deuxième classe est la suivante

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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public class Affichage1 extends javax.swing.JFrame {
 
 
 
    /**
     * Creates new form Affichage1
     */
    public Affichage1() {
        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() {
 
        jTextField1 = new javax.swing.JTextField();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
        jTextField1.setText("              Matrice de Confusion  ");
 
        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null,null},
                {null,null}
            },
            new String [] {
                "Classe 1", "Classe 2"
            }
        ));
        jScrollPane1.setViewportView(jTable1);
 
        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(84, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 234, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(82, 82, 82))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 203, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(97, 97, 97))))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(56, 56, 56)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(27, 27, 27)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(108, Short.MAX_VALUE))
        );
 
        pack();
    }// </editor-fold>
 
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
 
        /*
         * Set the Nimbus look and feel
         */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /*
         * If Nimbus (introduced in Java SE 6) is not available, stay with the
         * default look and feel. For details see
         * http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Affichage1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Affichage1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Affichage1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Affichage1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
 
        /*
         * Create and display the form
         */
        java.awt.EventQueue.invokeLater(new Runnable() {
 
            public void run() {
                new Affichage1().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable1;
    private javax.swing.JTextField jTextField1;
    // End of variables declaration
}

cette classe est une fenêtre que je veux qu'elle m'affiche la matrice "élémentsConfusion" calculée après ce que l'utilisateur entre ses données dans la première classe.
Merci

Variables et Classes

avec Java

Vue hybride

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