技術標籤：技術雜壇

1、++ 該方法用於連線兩個集合

var mapList = Map.empty[String, Long]
    mapList += "zho1" -> 1L
    mapList += "zho2" -> 2L
    mapList += "zho3" -> 3L
return => Map(zho1 -> 1, zho2 -> 2, zho3 -> 3)

val ee1 = l.map(line => {
      mapList
    }
 
).toList
    println(ee1)
return => List(Map(zho1 -> 1, zho2 -> 2, zho3 -> 3), Map(zho1 -> 1, zho2 -> 2, zho3 -> 3))
val l = Array[String]("1", "2")
    val ee: Map[String, Long] = l.map(line => {
      mapList += line -> 5L
      mapList
    }).reduce(
 
(A, B) => A ++ B)
    println(ee)
return => Map(zho1 -> 1, zho2 -> 2, zho3 -> 3)

2、JSON 資料異常捕獲

物件                                                                                                                                                        
if (StringUtils.isNotBlank(line) &&
 
 line.trim.startsWith("{") && line.trim.endsWith("}"))                                                                   
集合                                                                                                                                                        
if(jsonObject.get("pois")!=null && jsonObject.get("pois").toString().startsWith("[") && !"null".equals(fromObject.get("records").toString()));