Como gerar um contador apartir do botão Inserir e que mostre na label

adriano_eurich · Setembro 17, 2018, 11:59pm

package interfaces;

import javax.swing.table.DefaultTableModel;

public class jifCadastro extends javax.swing.JInternalFrame {

/**
 * Creates new form jifCadastro
 */
public jifCadastro() {
    initComponents();

}

@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    jPanel1 = new javax.swing.JPanel();
    jLabel2 = new javax.swing.JLabel();
    btnNovo = new javax.swing.JButton();
    btnExcluir = new javax.swing.JButton();
    jLabel3 = new javax.swing.JLabel();
    txtSacola = new javax.swing.JTextField();
    txtDocumento = new javax.swing.JTextField();
    txtUsuario = new javax.swing.JTextField();
    btnLimpar = new javax.swing.JButton();
    btnSair = new javax.swing.JButton();
    jLabel1 = new javax.swing.JLabel();
    jLabel = new javax.swing.JLabel();
    jScrollPane1 = new javax.swing.JScrollPane();
    TabelaCadastro = new javax.swing.JTable();

    setIconifiable(true);
    setMaximizable(true);
    setTitle("Cadastro de Usúario");
    setAlignmentX(1.0F);
    setAlignmentY(1.0F);

    jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder(javax.swing.BorderFactory.createEtchedBorder(new java.awt.Color(153, 153, 255), null), "Cadastro de Dados", javax.swing.border.TitledBorder.DEFAULT_JUSTIFICATION, javax.swing.border.TitledBorder.DEFAULT_POSITION, null, new java.awt.Color(102, 102, 255)));

    jLabel2.setText("Documento: ");

    btnNovo.setText("Inserir");
    btnNovo.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnNovoActionPerformed(evt);
        }
    });

    btnExcluir.setText("Excluir");
    btnExcluir.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnExcluirActionPerformed(evt);
        }
    });

    jLabel3.setText("Usúario: ");

    btnLimpar.setText("Limpar");
    btnLimpar.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnLimparActionPerformed(evt);
        }
    });

    btnSair.setText("Sair");
    btnSair.setEnabled(false);
    btnSair.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnSairActionPerformed(evt);
        }
    });

    jLabel1.setText("Sacola: ");

    jLabel.setText("0");

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    jPanel1.setLayout(jPanel1Layout);
    jPanel1Layout.setHorizontalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addGap(23, 23, 23)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addComponent(btnNovo, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(btnExcluir, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(28, 28, 28)
                    .addComponent(btnLimpar, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(26, 26, 26)
                    .addComponent(btnSair, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jLabel1)
                        .addComponent(jLabel2)
                        .addComponent(jLabel3))
                    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                        .addGroup(jPanel1Layout.createSequentialGroup()
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addGroup(jPanel1Layout.createSequentialGroup()
                                    .addComponent(txtSacola, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                    .addComponent(jLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 43, javax.swing.GroupLayout.PREFERRED_SIZE))
                                .addComponent(txtDocumento, javax.swing.GroupLayout.PREFERRED_SIZE, 150, javax.swing.GroupLayout.PREFERRED_SIZE)))
                        .addGroup(jPanel1Layout.createSequentialGroup()
                            .addGap(10, 10, 10)
                            .addComponent(txtUsuario, javax.swing.GroupLayout.PREFERRED_SIZE, 333, javax.swing.GroupLayout.PREFERRED_SIZE)))))
            .addContainerGap(224, Short.MAX_VALUE))
    );
    jPanel1Layout.setVerticalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel1)
                .addComponent(txtSacola, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jLabel))
            .addGap(25, 25, 25)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel2)
                .addComponent(txtDocumento, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(26, 26, 26)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel3)
                .addComponent(txtUsuario, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(18, 18, 18)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(btnSair, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(btnExcluir, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                    .addGap(0, 0, Short.MAX_VALUE)
                    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(btnLimpar, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(btnNovo, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE))))
            .addGap(30, 30, 30))
    );

    TabelaCadastro.setModel(new javax.swing.table.DefaultTableModel(
        new Object [][] {

        },
        new String [] {
            "Sacola", "Documento", "Usúario"
        }
    ));
    jScrollPane1.setViewportView(TabelaCadastro);

    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(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 663, Short.MAX_VALUE))
            .addContainerGap())
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(6, 6, 6)
            .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addGap(18, 18, 18)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 195, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );

    setBounds(160, 90, 699, 484);
}// </editor-fold>                        

    

private void btnSairActionPerformed(java.awt.event.ActionEvent evt) {                                        
    
    System.exit(0);
    btnSair.setEnabled(false);
}                                       

private void btnExcluirActionPerformed(java.awt.event.ActionEvent evt) {                                           
    
    ((DefaultTableModel) TabelaCadastro.getModel()).removeRow(TabelaCadastro.getSelectedRow());
}                                          

private void btnLimparActionPerformed(java.awt.event.ActionEvent evt) {                                          
    
    txtSacola.setText("");
    txtDocumento.setText("");
    txtUsuario.setText("");
}                                         

private void btnNovoActionPerformed(java.awt.event.ActionEvent evt) {                                        
    
    
    String sacola=txtSacola.getText().trim();
    String documento=txtDocumento.getText().trim();
    String usuario=txtUsuario.getText().trim();
    
DefaultTableModel val = (DefaultTableModel) TabelaCadastro.getModel();
val.addRow(new String[]{sacola, documento, usuario});
    
    txtSacola.setText("");
    txtDocumento.setText("");
    txtUsuario.setText("");
    
    txtSacola.requestFocus();
}                                       


// Variables declaration - do not modify                     
private javax.swing.JTable TabelaCadastro;
private javax.swing.JButton btnExcluir;
private javax.swing.JButton btnLimpar;
private javax.swing.JButton btnNovo;
private javax.swing.JButton btnSair;
private javax.swing.JLabel jLabel;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JPanel jPanel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextField txtDocumento;
private javax.swing.JTextField txtSacola;
private javax.swing.JTextField txtUsuario;
// End of variables declaration

}

Jonathan_Medeiros · Setembro 18, 2018, 12:26am

private int contador;

private int geraContador() {
    return contador ++;
}

No evento do botão coloque:

jLabel.setText(Integer.toString(geraContador()));

adriano_eurich · Setembro 18, 2018, 12:53am

Olá Jonatham, obrigado pela resposta, mas não consegui gerar o contador, não sei o que está acontecendo, sou novo na programação, talvez seja algo simples, mas estou me batendo rrsrs…

Jonathan_Medeiros · Setembro 18, 2018, 1:59am

Qual é o erro que ocorre ?

adriano_eurich · Setembro 18, 2018, 6:14pm

Ele compila sem nenhum erro, mas o evento do botão que estava adicionando não adiciona mais e também, não adiciona o numero como contador na jlabel e apos clicar no botão ele dispara varios erros vou postar a imagem dos erros.

adriano_eurich · Setembro 18, 2018, 6:24pm

Quando clico em inserir ele não esta mais add ta tabela em baixo e também, não gera o contador na jlabel

adriano_eurich · Setembro 18, 2018, 6:24pm

package interfaces;

import javax.swing.table.DefaultTableModel;

public class jifCadastro extends javax.swing.JInternalFrame {

public jifCadastro() {
    initComponents();
}


@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    jPanel1 = new javax.swing.JPanel();
    jLabel2 = new javax.swing.JLabel();
    btnNovo = new javax.swing.JButton();
    btnExcluir = new javax.swing.JButton();
    jLabel3 = new javax.swing.JLabel();
    txtSacola = new javax.swing.JTextField();
    txtDocumento = new javax.swing.JTextField();
    txtUsuario = new javax.swing.JTextField();
    btnLimpar = new javax.swing.JButton();
    btnSair = new javax.swing.JButton();
    jLabel1 = new javax.swing.JLabel();
    jLabel = new javax.swing.JLabel();
    jScrollPane1 = new javax.swing.JScrollPane();
    TabelaCadastro = new javax.swing.JTable();

    setIconifiable(true);
    setMaximizable(true);
    setTitle("Cadastro de Usúario");
    setAlignmentX(1.0F);
    setAlignmentY(1.0F);

    jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder(javax.swing.BorderFactory.createEtchedBorder(new java.awt.Color(153, 153, 255), null), "Cadastro de Dados", javax.swing.border.TitledBorder.DEFAULT_JUSTIFICATION, javax.swing.border.TitledBorder.DEFAULT_POSITION, new java.awt.Font("Tahoma", 0, 11), new java.awt.Color(102, 102, 255))); // NOI18N

    jLabel2.setText("Documento: ");

    btnNovo.setText("Inserir");
    btnNovo.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnNovoActionPerformed(evt);
        }
    });

    btnExcluir.setText("Excluir");
    btnExcluir.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnExcluirActionPerformed(evt);
        }
    });

    jLabel3.setText("Usúario: ");

    btnLimpar.setText("Limpar");
    btnLimpar.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnLimparActionPerformed(evt);
        }
    });

    btnSair.setText("Sair");
    btnSair.setEnabled(false);
    btnSair.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btnSairActionPerformed(evt);
        }
    });

    jLabel1.setText("Sacola: ");

    jLabel.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
    jLabel.setForeground(new java.awt.Color(255, 0, 0));
    jLabel.setText("0");

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    jPanel1.setLayout(jPanel1Layout);
    jPanel1Layout.setHorizontalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addGap(23, 23, 23)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addComponent(btnNovo, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(btnExcluir, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(28, 28, 28)
                    .addComponent(btnLimpar, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(26, 26, 26)
                    .addComponent(btnSair, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jLabel1)
                        .addComponent(jLabel2)
                        .addComponent(jLabel3))
                    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(jPanel1Layout.createSequentialGroup()
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addComponent(txtDocumento, javax.swing.GroupLayout.PREFERRED_SIZE, 150, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGroup(jPanel1Layout.createSequentialGroup()
                                    .addComponent(txtSacola, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                    .addComponent(jLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 26, javax.swing.GroupLayout.PREFERRED_SIZE))))
                        .addGroup(jPanel1Layout.createSequentialGroup()
                            .addGap(10, 10, 10)
                            .addComponent(txtUsuario, javax.swing.GroupLayout.PREFERRED_SIZE, 333, javax.swing.GroupLayout.PREFERRED_SIZE)))))
            .addContainerGap(234, Short.MAX_VALUE))
    );
    jPanel1Layout.setVerticalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel1)
                .addComponent(txtSacola, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jLabel))
            .addGap(25, 25, 25)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel2)
                .addComponent(txtDocumento, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(26, 26, 26)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel3)
                .addComponent(txtUsuario, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(18, 18, 18)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(btnSair, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(btnExcluir, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                    .addGap(0, 0, Short.MAX_VALUE)
                    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(btnLimpar, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(btnNovo, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE))))
            .addGap(30, 30, 30))
    );

    TabelaCadastro.setModel(new javax.swing.table.DefaultTableModel(
        new Object [][] {

        },
        new String [] {
            "Sacola", "Documento", "Usúario"
        }
    ));
    jScrollPane1.setViewportView(TabelaCadastro);

    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(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 673, Short.MAX_VALUE))
            .addContainerGap())
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(6, 6, 6)
            .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addGap(18, 18, 18)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 195, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );

    setBounds(160, 90, 699, 484);
}// </editor-fold>                        

private void btnSairActionPerformed(java.awt.event.ActionEvent evt) {                                        
    
    System.exit(0);
    btnSair.setEnabled(false);
}                                       

private void btnExcluirActionPerformed(java.awt.event.ActionEvent evt) {                                           
    
    ((DefaultTableModel) TabelaCadastro.getModel()).removeRow(TabelaCadastro.getSelectedRow());
}                                          

private void btnLimparActionPerformed(java.awt.event.ActionEvent evt) {                                          
    
    txtSacola.setText("");
    txtDocumento.setText("");
    txtUsuario.setText("");
}                                         

private Integer contador;

    private Integer geraContador() {
return contador ++;

}

private void btnNovoActionPerformed(java.awt.event.ActionEvent evt) {                                        
    
    jLabel.setText(Integer.toString(geraContador()));
    
    String sacola=txtSacola.getText().trim();
    String documento=txtDocumento.getText().trim();
    String usuario=txtUsuario.getText().trim();
    
DefaultTableModel val = (DefaultTableModel) TabelaCadastro.getModel();
val.addRow(new String[]{sacola, documento, usuario});
    
    txtSacola.setText("");
    txtDocumento.setText("");
    txtUsuario.setText("");
    
    txtSacola.requestFocus();
}                                       


// Variables declaration - do not modify                     
private javax.swing.JTable TabelaCadastro;
private javax.swing.JButton btnExcluir;
private javax.swing.JButton btnLimpar;
private javax.swing.JButton btnNovo;
private javax.swing.JButton btnSair;
private javax.swing.JLabel jLabel;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JPanel jPanel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextField txtDocumento;
private javax.swing.JTextField txtSacola;
private javax.swing.JTextField txtUsuario;
// End of variables declaration

}

Jonathan_Medeiros · Setembro 18, 2018, 7:08pm

Amigo altere a tipagem da variável e o retorno do método do tipo classe para o tipo nativo!

Integer -> int

Editei a resposta acima para o formato correto, ficaria desta maneira:

private int contador;

private int geraContador() {
    return contador ++;
}

adriano_eurich · Setembro 18, 2018, 7:35pm

Muuuito obrigado Jonathan, agora deu certo, estava a tempo me batendo, comecei a pouco tempo a programar, estou estudando pelo youtube com algumas vídeo aulas, mas tem hora que a coisa não vai, fico muto agradecido pela ajuda…

Jonathan_Medeiros · Setembro 18, 2018, 8:38pm

De nada!
Apanhar um pouco faz parte do aprendizado kkkkk

Lembre sempre de finalizar o tópico quando sua dúvida/problema for sanado/resolvido, para que assim o tópico fique sinalizado como resolvido.
Isso evita que outros membros do GUJ tenham que abrir o tópico e analisarem tudo para assim verem que já foi solucionado.

Como gerar um contador apartir do botão Inserir e que mostre na label

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