Call JButon from one JFrame to another

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I'm a beginner in this area, and I have a little problem, if you can help me, thank you.

I have two Frames one is main (P) and the other (B) I call through a button. In the main screen I have two buttons register and access, when I run the main screen appears, the register button does not appear (this is intentional) being visible only the access button, when clicking the access button it calls the frame (B) that finally has two buttons, confirm and cancel, clicking the confirm button it returns to the main frame (P), this time with the button register visible, but I have no idea how I can use the register button of the frame (P) in the frame (B ).

I will send the complete code as I am doing in netbeans will get a bit long .. This is the main class that when you click the Access button will open the frame B screen. 

package javaapplication2;

public class Principal extends javax.swing.JFrame {

    /**
     * Creates new form Principal
     */
    public Principal() {
        initComponents();
        JBCadastrar.setVisible(false);


    }

    /**
     * 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() {

        JBCadastrar = new javax.swing.JButton();
        JBAcessar = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        JBCadastrar.setText("Cadastrar");

        JBAcessar.setText("Acessar");
        JBAcessar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                JBAcessarActionPerformed(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()
                .addGap(147, 147, 147)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(JBCadastrar, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(JBAcessar, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addContainerGap(172, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(106, 106, 106)
                .addComponent(JBCadastrar)
                .addGap(38, 38, 38)
                .addComponent(JBAcessar)
                .addContainerGap(110, Short.MAX_VALUE))
        );

        setSize(new java.awt.Dimension(416, 338));
        setLocationRelativeTo(null);
    }// </editor-fold>                        

    private void JBAcessarActionPerformed(java.awt.event.ActionEvent evt) {                                          
        String args [] = new String [1];
        FrameB1.main(args);

    }                                         

    /**
     * @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(Principal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Principal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Principal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Principal.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 Principal().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton JBAcessar;
    private javax.swing.JButton JBCadastrar;
    // End of variables declaration     
}

This other is FrameB1 

package javaapplication2;

public class FrameB1 extends javax.swing.JFrame {

    /**
     * Creates new form FrameB1
     */
    public FrameB1() {
        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() {

        JBConfirmar = new javax.swing.JButton();
        JBCancelar = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        JBConfirmar.setText("Confirmar");
        JBConfirmar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                JBConfirmarActionPerformed(evt);
            }
        });

        JBCancelar.setText("Cancelar");
        JBCancelar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                JBCancelarActionPerformed(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()
                .addGap(70, 70, 70)
                .addComponent(JBConfirmar)
                .addGap(76, 76, 76)
                .addComponent(JBCancelar)
                .addContainerGap(100, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(124, 124, 124)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(JBConfirmar)
                    .addComponent(JBCancelar))
                .addContainerGap(153, Short.MAX_VALUE))
        );

        setSize(new java.awt.Dimension(416, 338));
        setLocationRelativeTo(null);
    }// </editor-fold>                        

    private void JBConfirmarActionPerformed(java.awt.event.ActionEvent evt) {                                            
        String args [] = new String [1];
        Principal.main(args);
        dispose();
    }                                           

    private void JBCancelarActionPerformed(java.awt.event.ActionEvent evt) {                                           
        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(FrameB1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(FrameB1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(FrameB1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(FrameB1.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 FrameB1().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton JBCancelar;
    private javax.swing.JButton JBConfirmar;
    // End of variables declaration                   
}

So, notice that in the first frame I left the button invisible and when I click on access it will call the frameB1 screen, and when I press the confirm button it will close the frameB1 window by calling back the main frame already with the register button visible. but I can not do this ...

    
asked by anonymous 27.10.2017 / 21:43

1 answer

0

Let's make what the buttons in your class do Principal : 

    private void JBAcessarActionPerformed(java.awt.event.ActionEvent evt) {
        String args [] = new String [1];
        FrameB1.main(args);

    }

Let's look at your class FrameB1 : 

    private void JBConfirmarActionPerformed(java.awt.event.ActionEvent evt) {
        String args [] = new String [1];
        Principal.main(args);
        dispose();
    }        

    private void JBCancelarActionPerformed(java.awt.event.ActionEvent evt) {
        dispose();
    }

You have two methods main here, one in each class, which is wrong. You should only have one method main and should never invoke it directly .

Your mistake is to stick to the idea that only one screen is active at a time and forget that these are objects. Instead, separate a file named Main.java : 

package javaapplication2;

public class Main {
    public static void main(String[] args) {
        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 | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }

        java.awt.EventQueue.invokeLater(() -> new Principal().setVisible(true));
    }
}

In your FrameB1 class, change this: 

    public FrameB1() {
        initComponents();
    }

So: 

    private final Principal telaPrincipal;

    public FrameB1(Principal telaPrincipal) {
        this.telaPrincipal = telaPrincipal;
        initComponents();
    }

And also this: 

    private void JBConfirmarActionPerformed(java.awt.event.ActionEvent evt) {
        String args [] = new String [1];
        Principal.main(args);
        dispose();
    } 

    private void JBCancelarActionPerformed(java.awt.event.ActionEvent evt) {
        dispose();
    }

So: 

    private void JBConfirmarActionPerformed(java.awt.event.ActionEvent evt) {
        telaPrincipal.reativar(true);
        dispose();
    } 

    private void JBCancelarActionPerformed(java.awt.event.ActionEvent evt) {
        telaPrincipal.dispose();
        dispose();
    }

In your Principal class, add this method: 

    public void reativar(boolean botaoCadastrarVisivel) {
        setVisible(true);
        JBCadastrar.setVisible(botaoCadastrarVisivel);
    }

Change this method: 

    private void JBAcessarActionPerformed(java.awt.event.ActionEvent evt) {
        String args [] = new String [1];
        FrameB1.main(args);

    }

So: 

    private void JBAcessarActionPerformed(java.awt.event.ActionEvent evt) {
        FrameB1 fb = new FrameB1(this);
        setVisible(false);
    }

And then, you can remove the main method from both Principal and FrameB1 classes.

    
27.10.2017 / 22:14
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