private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton3ActionPerformed
        int origen = this.cbxeorigen.getSelectedIndex();
        int simbolo = this.cbxsimbolo.getSelectedIndex();
        int destino = this.cbxedestino.getSelectedIndex();
        if (this.rbbefinal.isSelected()) {
            destino = destino * -1;
        }
        this.table_trans.setValueAt(destino, origen, simbolo + 1);
        this.rbbefinal.setSelected(false);
        this.cbxeorigen.setSelectedIndex(0);
        this.cbxsimbolo.setSelectedIndex(0);
        this.cbxedestino.setSelectedIndex(0);

    }//GEN-LAST:event_jButton3ActionPerformed