CODE

  private void jButton_LOGINActionPerformed(java.awt.event.ActionEvent evt) {
PreparedStatement ps;
        ResultSet rs;
        String username = txtusername.getText();
        String password = String.valueOf(txtpass.getPassword());

        String query = "SELECT * FROM `t_user` WHERE `username` =? AND `password` =?";

        try {
            ps = KoneksiDB.getkoneksi().prepareStatement(query);

            ps.setString(1, username);
            ps.setString(2, password);

            rs = ps.executeQuery();

            if(rs.next())
            {
                    F_MenuUtama mf = new F_MenuUtama();
                    mf.setVisible(true);
                    mf.pack();
                    mf.setLocationRelativeTo(null);
                    mf.setExtendedState(JFrame.MAXIMIZED_BOTH);
                  //  mf.Label1.setText("Welcome < "+username+" >");

                    this.dispose();
            }
            else{
                    JOptionPane.showMessageDialog(null, "Incorrect Username Or Password", "Login Failed", 2);
                }

        } catch (SQLException ex) {
            Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
        }


    }