How to make a Jframe return an instance of a given object?

Question

I have a JFrame called Jframecadastre person which has only two fields name and surname, as shown in the image :

Jframecadastre person:

public class JFrameCadastroPessoa extends javax.swing.JFrame {

     private Pessoa  pessoa = new Pessoa();

    //codigos gerados automaticamente

    //O código do botão salvar é o seguinte: 
    private void jBSalvarActionPerformed(java.awt.event.ActionEvent evt) {

            pessoa.setNome(jTFNome.getText());  
            pessoa.setApelido(jTFApelido.getSelectedText());

    }
   private void jBLimparActionPerformed(java.awt.event.ActionEvent evt) {                                         
        jTFNome.setText("");
        jTFApelido.setText("");
    }                                        

    public Pessoa salvar() {

        return pessoa;
    }

}

Classe Pessoa

    public class Pessoa implements Serializable {

        String nome;
        String apelido;

        public Pessoa() {
        }

        public Pessoa(String nome, String apelido) {
            this.nome = nome;
            this.apelido = apelido;
        }

       //getters and setters


  public String toString() {
        return " { nome=" + nome + ", apelido=" + apelido + '}' + "\n";
    }
}

Person in need

  public class ExibePessoa {
    public static void main(String[] args) {
        JFrameCadastroPessoa frame = new JFrameCadastroPessoa();
        frame.setVisible(true);
        Pessoa pessoa = new Pessoa();
         pessoa = frame.salvar();
        System.out.println(pessoa.toString());
    }
}

I want to know why he always displays the result as :

 { nome=null, apelido=null}  

I would like to display the data I entered in the frame JFrameCadastroPessoa.

What should I do to return this object in the Exibepessoa class?

The problem is that when I run the Exibepessoa class on the console it is already printing { name=null, nickname=null} on the output before I even enter the data into the frame!!!

Using the JOptionPane.showInputDialog in the class Exibepessoa I get the expected balance but I really wanted to use was the JFrame!!

I know this has a very obvious answer but I have tried everything , and it is my knowledge that it would be more plausible to resolve things simply within the class JFrameCadastroPessoa and solve everything in the way private void jBSalvarActionPerformed(java.awt.event.ActionEvent evt) , but really need the solution so that the result comes from the save() method that returns a Person.

Answer 1

When you call JFrameCadastroPessoa frame = new JFrameCadastroPessoa();, the object Person is created with the null attributes in the Jframe class, and the JRE follows the normal flow, running all lines of its main without interruption, and when it arrives in System.out.println(pessoa.toString());, it displays the object created in your class JFrameCadastroPessoa, with the null properties.

You must add the display inside the actionperformed so that it is displayed only by clicking the button, this way:

private void jBSalvarActionPerformed(java.awt.event.ActionEvent evt) {

        pessoa.setNome(jTFNome.getText());  
        pessoa.setApelido(jTFApelido.getSelectedText());
        System.out.println(pessoa.toString());
}

Here yes, it will be displayed exactly what is typed in the fields.

---

Update

After the comments, I created an example where you can use a custom Joptionpane, passing a Jpanel to it:

public class ExibePessoa {
    public static void main(String[] args) {

        Pessoa pessoa;

        JPanel p1 = new JPanel();
        JPanel p2 = new JPanel();
        JPanel panelPrincipal = new JPanel(new BorderLayout());
        JLabel lbNome = new JLabel("Nome:");
        JTextField txtNome = new JTextField(20);
        JLabel lbApelido = new JLabel("Apelido:");
        JTextField txtApelido = new JTextField(20);
        p1.add(lbNome);
        p1.add(txtNome);
        p2.add(lbApelido);
        p2.add(txtApelido);
        panelPrincipal.add(p1, BorderLayout.NORTH);
        panelPrincipal.add(p2, BorderLayout.SOUTH);
        JOptionPane.showMessageDialog(null, panelPrincipal, "Acesso Restrito", JOptionPane.PLAIN_MESSAGE);
        pessoa = new Pessoa(txtNome.getText(), txtApelido.getText());
        
        System.out.println(pessoa.toString());
    }
}