Amigos,
Estou a dois dias tentando solucionar esse problema e até agora não consegui. Segue abaixo minhas classes, em seguida falo o que estou tentando fazer.
package novoprojeto;
import java.util.ArrayList;
import javax.swing.JTable;
public class FormPrincipal extends javax.swing.JFrame {
MinhaTabela mt;
FormIncluir fi;
public FormPrincipal() {
initComponents();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jPanel2 = new javax.swing.JPanel();
JTable tabela = new JTable();
ArrayList<Carro> carro = new ArrayList();
mt = new MinhaTabela(carro);
tabela.setModel(mt);
jScrollPane2 = new javax.swing.JScrollPane(tabela);
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("Incluir");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("Excluir");
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(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton2, javax.swing.GroupLayout.DEFAULT_SIZE, 110, Short.MAX_VALUE)))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(32, 32, 32)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 69, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 69, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(49, 49, 49))
);
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGap(20, 20, 20)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 431, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(25, Short.MAX_VALUE))
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 245, Short.MAX_VALUE)
.addContainerGap())
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(22, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
fi = new FormIncluir();
fi.setVisible(true);
fi.setDefaultCloseOperation(HIDE_ON_CLOSE);
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JScrollPane jScrollPane2;
// End of variables declaration
package novoprojeto;
import java.util.ArrayList;
import javax.swing.table.AbstractTableModel;
public class MinhaTabela extends AbstractTableModel {
private ArrayList<Carro> linhas = null;
private static final String[] colunas = { "Marca", "Modelo", "Placa", "Ano" };
// Construtor da classe recebe os dados a ser populado
public MinhaTabela(ArrayList<Carro> c) {
//linhas = new ArrayList<>(c);
this.linhas = c;
fireTableStructureChanged();
}
// Método sobrescrito que retorna o número de linhas do JTable, após populado
@Override
public int getRowCount() {
if (this.linhas == null)
{
return 0;
}
else
{
return this.linhas.size();
}
}
// Método sobrescrito que retorna o número de colunas do JTable após populado
@Override
public int getColumnCount() {
return colunas.length;
}
// Método sobrescrito que vai popular e retornar cada célula do JTable
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
Carro c = linhas.get(rowIndex);
Object row = null;
switch(columnIndex){
case 0: row = c.getMarca();
break;
case 1: row = c.getModelo();
break;
case 2: row = c.getPlaca();
break;
case 3: row = c.getAno();
break;
}
return row;
}
/* Este método sobrescrito, permite voce editar o JTable, caso o método anterior
tenha algumas colunas de algumas ou todas linhas editáveis setadas para true,
ou que tenha como retorno o valor true para todas as linhas e colunas. */
public void setValueAt(Object value, int rowIndex, int columnIndex){
Carro c = linhas.get(rowIndex);
switch(columnIndex){
case 0: c.setMarca((String)value);
break;
case 1: c.setModelo((String)value);
break;
case 2: c.setPlaca((String)value);
break;
case 3: c.setAno((Integer)value);
break;
}
}
/* Este método sobrescrito vai definir o nome das colunas
que foi atribuído na constante "col" logo no início da classe */
@Override
public String getColumnName(int column){
return colunas[column];
}
/* Este método criado por nós, vai retornar o conjunto
de dados inteiro do JTable, através de um List contendo
Objetos ClienteBean populados. */
public ArrayList<Carro> getLinhas() {
return linhas;
}
public void addRow(Carro c){
linhas.add(c);
fireTableDataChanged();
//this.fireTableRowsInserted(linhas.size()-1,linhas.size()-1);
}
}
package novoprojeto;
import javax.swing.JOptionPane;
public class FormIncluir extends javax.swing.JFrame {
CadastroVeiculo cad = new CadastroVeiculo();
public FormIncluir() {
initComponents();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jTextFieldMarca = new javax.swing.JTextField();
jTextFieldModelo = new javax.swing.JTextField();
jTextFieldAno = new javax.swing.JTextField();
jTextFieldPlaca = new javax.swing.JTextField();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("Marca:");
jLabel2.setText("Modelo:");
jLabel3.setText("Ano:");
jLabel4.setText("Placa:");
jButton1.setText("Cadastrar");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jLabel4)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jTextFieldPlaca, javax.swing.GroupLayout.PREFERRED_SIZE, 124, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jLabel3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jTextFieldAno, javax.swing.GroupLayout.PREFERRED_SIZE, 124, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jTextFieldModelo, javax.swing.GroupLayout.PREFERRED_SIZE, 124, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jLabel1)
.addGap(30, 30, 30)
.addComponent(jTextFieldMarca, javax.swing.GroupLayout.PREFERRED_SIZE, 124, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(148, 148, 148)
.addComponent(jButton1)))
.addContainerGap(151, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(25, 25, 25)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(jTextFieldMarca, 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.BASELINE)
.addComponent(jLabel2)
.addComponent(jTextFieldModelo, 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.BASELINE)
.addComponent(jLabel3)
.addComponent(jTextFieldAno, 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.BASELINE)
.addComponent(jLabel4)
.addComponent(jTextFieldPlaca, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 58, Short.MAX_VALUE)
.addComponent(jButton1)
.addGap(30, 30, 30))
);
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()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGap(19, 19, 19))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String marca = jTextFieldMarca.getText();
String modelo = jTextFieldModelo.getText();
int ano = Integer.parseInt(jTextFieldAno.getText());
String placa = jTextFieldPlaca.getText();
cad.inserirCarro(marca, modelo, ano, placa);
}
/**
* @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(FormIncluir.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(FormIncluir.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(FormIncluir.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(FormIncluir.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 FormIncluir().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JPanel jPanel1;
private javax.swing.JTextField jTextFieldAno;
private javax.swing.JTextField jTextFieldMarca;
private javax.swing.JTextField jTextFieldModelo;
private javax.swing.JTextField jTextFieldPlaca;
// End of variables declaration
}
package novoprojeto;
import javax.swing.JOptionPane;
public class CadastroVeiculo {
MinhaTabela mt;
public void inserirCarro(String marca, String modelo, int ano, String placa){
try{
if(!(marca.equals("") | modelo.equals("") | ano == 0 | placa.equals(""))){
Carro novoCarro = new Carro();
novoCarro.setMarca(marca);
novoCarro.setModelo(modelo);
novoCarro.setAno(ano);
novoCarro.setPlaca(placa);
mt.addRow(novoCarro);
JOptionPane.showMessageDialog(null, "Veiculo Cadastrado com sucesso!");
}else{
throw new CampoNaoPreenchido("Algum campo não foi preenchido, favor verificar.");
}
}catch(CampoNaoPreenchido e){
JOptionPane.showMessageDialog(null, e.getMessage());
}
}
}
Seguinte:
Na classe MinhaTabela eu criei um modelo de JTable.
Dentro da classe FormPrincipal eu instanciei a classe MinhaTabela e criei uma tabela dentro do formulário.
Na FormIncluir eu capturo os dados dos JtextField e através de um método passo os dados para a classe CadastroVeiculo.
Na classe CadastroVeiculo incluo dentro do Objeto Carro e tento através da instancia já iniciada da classe MinhaTabela incluir o Objeto dentro de um ArrayList que está na classe MinhaTabela.
O problema está ocorrendo exatamente na chamada desse método:
mt.addRow(novoCarro);
Ele retorna sempre o seguinte erro:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
Alguem sabe o q estou fazendo errado?
