private void btn_saveActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btn_saveActionPerformed
        // TODO add your handling code here:
        String nomeprod, qtdprod, codprod, dataped;
        
        nomeprod = txt_nomeprod.getText();
        qtdprod = txt_qtdprod.getText();
        codprod = txt_codforn.getText();
        dataped = txt_datapedido.getText();
        
        if(nomeprod.isEmpty()|| qtdprod.isEmpty()|| codprod.isEmpty() || dataped.isEmpty()){
            JOptionPane.showMessageDialog(rootPane, "Por favor, preencha todos os campos!!");
        } 
        
    }//GEN-LAST:event_btn_saveActionPerformed