String Cannot Be Converted to

6 respostas
J

Olá, estou fazendo um projeto Java para cadastro de Motorista com JPanel. Porém aconteceu um erro que não sei resolver no botão salvar. Quando chamo o GetText ele apresenta esse erro “String Cannot be Converted to Motorista”. Nesta tela:

package my.contacteditor;

import Conexao.ConnectionFactory;
import DAO.MotoristaDAO;

public class CadastroMotorista extends javax.swing.JFrame {

    ConnectionFactory conecta = new ConnectionFactory();
    MotoristaDAO motoristaDAO = new MotoristaDAO();
    Motorista motorista = new Motorista();

 public CadastroMotorista() {
        initComponents();
        this.setLocationRelativeTo(null);
    }

 @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();
        txtId = new javax.swing.JTextField();
        txtNome = new javax.swing.JTextField();
        btnSalvar = new javax.swing.JButton();
        btnCancelar = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setText("Cadastro Motorista");

        jLabel2.setText("Id:");

        jLabel3.setText("Nome:");

        txtNome.setCursor(new java.awt.Cursor(java.awt.Cursor.TEXT_CURSOR));
        txtNome.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                txtNomeActionPerformed(evt);
            }
        });

        btnSalvar.setText("Salvar");
        btnSalvar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnSalvarActionPerformed(evt);
            }
        });

        btnCancelar.setText("Cancelar");

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel1)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(jLabel2)
                        .addGap(18, 18, 18)
                        .addComponent(txtId, javax.swing.GroupLayout.PREFERRED_SIZE, 66, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(jLabel3)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(txtNome, javax.swing.GroupLayout.PREFERRED_SIZE, 251, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addComponent(btnSalvar)
                                .addGap(38, 38, 38)
                                .addComponent(btnCancelar)))))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(txtId, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(21, 21, 21)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel3)
                    .addComponent(txtNome, 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(btnSalvar)
                    .addComponent(btnCancelar))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        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)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                        

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

//Trecho do erro: String cannot be converted to Motorista                                         
        MotoristaDAO.save(txtNome.getText());
    }                                         

    private void txtNomeActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
    }   

 private void txtNomeActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
    }                                       

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

    // Variables declaration - do not modify                     
    private javax.swing.JButton btnCancelar;
    private javax.swing.JButton btnSalvar;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JTextField txtId;
    private javax.swing.JTextField txtNome;
    // End of variables declaration                   
}

--------------------------------------------------------------------------------------------------
Classe DAO

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package DAO;

import Conexao.ConnectionFactory;
import Model.Motorista;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

/**
 *
 * @author Alfa Informática
 */
public class MotoristaDAO {
    
    private Connection con = null;

    public MotoristaDAO() {
        con = ConnectionFactory.getConnection();
    }
    
    
    public boolean save(Motorista motorista){
        String sql = "INSERT INTO motoristas (nome) VALUES (?)";
        PreparedStatement stmt = null;
        
        try {
            stmt = con.prepareStatement(sql);
            stmt.setString(1, motorista.getNome());
            stmt.executeUpdate();
            return true;
        } catch (SQLException ex) {
            System.out.println("Erro"+ex);
            return false;
        }
        finally{
            ConnectionFactory.closeConection(con, stmt);
        }
    }
    
    public boolean update(Motorista motorista){
        String sql = "UPDATE motoristas SET nome = ? WHERE idMotoristas = ?";
        PreparedStatement stmt = null;
        
        try {
            stmt = con.prepareStatement(sql);
            stmt.setString(1, motorista.getNome());
            stmt.setInt(2, motorista.getId());
            stmt.executeUpdate();
            return true;
        } catch (SQLException ex) {
            System.out.println("Erro"+ex);
            return false;
        }
        finally{
            ConnectionFactory.closeConection(con, stmt);
        }
    
    }
    
    public boolean delete(Motorista motorista){
        String sql = "DELETE FROM motoristas WHERE idMotoristas = ?";
        PreparedStatement stmt = null;
        
        try {
            stmt = con.prepareStatement(sql);
            stmt.setInt(1, motorista.getId());
            stmt.executeUpdate();
            return true;
        } catch (SQLException ex) {
            System.out.println("Erro"+ex);
            return false;
        }
        finally{
            ConnectionFactory.closeConection(con, stmt);
        }
    
    }
    
    public List <Motorista> findAll(){
        
        String sql = "SELECT * FROM motoristas";

        
        PreparedStatement stmt = null;
        ResultSet rs = null;
        
        List<Motorista> motoristas = new ArrayList<>();
        try {
            stmt = con.prepareStatement(sql);
            rs = stmt.executeQuery();
            
            while(rs.next()){
                Motorista motorista = new Motorista();
                motorista.setNome(rs.getString("Nome"));
                motoristas.add(motorista);
            }
        } catch (SQLException ex) {
            System.out.println("Erro"+ex);
        }finally{
            ConnectionFactory.closeConection(con, stmt, rs);
        }
        return motoristas;
    }
}
---------------------------------------------------------------------------------------------

Classe Motorista

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package Model;

/**
 *
 * @author Alfa Informática
 */
public class Motorista {
    private int id;
    private String nome;

    public Motorista() {
    }

    public Motorista(String nome) {
        this.nome = nome;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getNome() {
        return nome;
    }

    public void setNome(String nome) {
        this.nome = nome;
    }

    
}

6 Respostas

Jothar_Aleksander

O método save espera um objeto do tipo Motorista:

public boolean save(Motorista motorista),

mas tu está passando um objeto tipo String:

MotoristaDAO.save(txtNome.getText());

J

Então, não tinha observado isso, coloquei assim:

public void save(Motorista motorista){
        String sql = "INSERT INTO motoristas (nome) VALUES (?)";
        PreparedStatement stmt = null;
        
        try {
            stmt = con.prepareStatement(sql);
            stmt.setString(1, motorista.getNome());
            stmt.executeUpdate();

        } catch (SQLException ex) {
            System.out.println("Erro"+ex);
        
        }
        finally{
            ConnectionFactory.closeConection(con, stmt);
        }
    }

porém persiste o mesmo erro…

Jothar_Aleksander

Você consertou o problema? O método save está recebendo um objeto Motorista?

Arrumou essa parte: MotoristaDAO.save(txtNome.getText());?

Deve ser algo como:

public Motorista retornarMotorista(){
	Motorista motorista = new Motorista();
	
	motorista.setNome(txtNome.getText());
	
	return motorista;
}

MotoristaDAO.save(retornarMotorista());
J

Oi, consegui. Faltou importar a classe Model Motorista, e usei essa linha de comando

motorista.setNome(txtNome.getText());
motoristaDAO.save(motorista);

Estou fazendo esse projeto para ajudar o meu pai no trabalho dele, Obrigado! :_)

J

Vc conhece algum material que ensina a cadastrar FKs e Datas?

Jothar_Aleksander

Qual banco de dados está usando?

1 - Java: Java Tutorials - JDBC.
2 - SQL (básico e geral): SQL.
3 - Caso use MySQL: MySQL Manual
4 - Em vários sites e no YouTube.

Criado 28 de setembro de 2019
Ultima resposta 28 de set. de 2019
Respostas 6
Participantes 2