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Posted (edited)

Boa tarde 

Ao programar apareceu um erro do action listener

public class Login extends JFrame implements ActionListener

Diz que a classe login não é abestrata.

 

Segue-se o código 

 

import java.sql.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class Login extends JFrame implements ActionListener
{
    private JLabel lbA;
    private JLabel lbB;
    private JTextField tfA;
    private JTextField tfB;
    private JButton btEntrar;
    
    public Login ()
    {
        super ("Restaurante");
        this. setLayout(new FlowLayout ());
        
        lbA= new JLabel ("Utilizador:");
        lbB= new JLabel ("Pass:");
        tfA= new JTextField (10);
        tfB= new JTextField (10);
        btEntrar= new JButton ("Entrar");
        
        this.add(lbA);
        this.add(tfA);
        this.add(lbB);
        this.add(tfB);
        this.add(btEntrar);
        
        btEntrar.addActionListener(this);
        
        this.setSize(225,150);
        this.setVisible(true);
        
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    public static void main (String args[])
    {
       Login jb = new Login ();
    }
    
    public void actionPerfmormed (ActionEvent e){
        if(e.getSource()==btEntrar){
          entrar();
        } 
    }
    private void entrar (){
        final String JDBC_DRIVER="com.mysql.jdbc.Driver"; //nome do driver JDBC
        final String DB_URL="jdbc:mysql://localhost/restaurante"; //URL da bade de dados
        final String USER="root";
        final String PASS="";
        
        Connection conn=null;
        Statement stmt=null;
        try{
            Class.forName("com.mysql.jdbc.Driver"); //registar driver JDBC;
            conn=DriverManager.getConnection(DB_URL,USER ,PASS );
            
            stmt=conn.createStatement();
            
            String sql=" INSERT INTO restaurante.login VALUES ('" +tfA.getText() + "','"+tfB.getText() +"')";
            stmt.executeUpdate(sql);
            
             JOptionPane.showMessageDialog(this, "Registo Inserido!");

            
        } catch (SQLException se){
            //tratamentos de erros JDBC
            se.printStackTrace();}
        catch (Exception e){
            //tratamento de erros de Class.forName
            e.printStackTrace();}
        finally{
            //fecho dos recursos
            try{
                if (conn!=null)conn.close();
            }catch (SQLException se){se.printStackTrace();}
        }
    }
}


 

O código ainda se encontra incompleto

 

Cumps

Edited by apocsantos
geshi

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