TextField Java Postgresql

try {                 
         String sql="SELECT max(vend_id) AS vend_id FROM tb_vendas";
         pst=con.prepareStatement(sql);
         rs=pst.executeQuery();
         if(rs.next()){
            txtID.setText(String.valueOf(Integer.parseInt(rs.getString("vend_id"))+1));
         }
         else 
         {
            txtID.setText("1");
         }                 
     } catch (Exception e) {
         System.out.println("Erro"+e);
     }