代码里有很多if怎么办

Question

这种结构的代码如何处理

 if(id != null){
            whereSQL.append("id = "+id).append(" and ");
        }else  if(mobile != null){
            whereSQL.append("mobile = "+mobile).append(" and ");
        }else  if(agentsName != null){
            whereSQL.append("agentsName = "+agentsName).append(" and ");
        }else  if(id != null){
            whereSQL.append("userId = "+userId).append(" and ");
        }else  if(id != null){
            whereSQL.append("invitationCode = "+invitationCode).append(" and ");
        }else  if(id != null){
            whereSQL.append("agentType = "+agentType).append(" and ");
        }else  if(id != null){
            whereSQL.append("del = "+del).append(" and ");
        }else  if(id != null){
            whereSQL.append("areaIds = "+areaIds).append(" and ");
        }

Answer 1

你是不是写错了 一堆id != null