有时在Scala中调用Java的库,Java库会返回某些Java的集合或类型,必须经过一些转换才能正常使用。 否则有可能在编译的过程遇到这个错误。 错误字符串 下面是错误的主要信息。 Scala Java Error: value filter is not a member of * 解决办法 在代码中引入下面名字空间,引用Java和Scala的各种集合和类型之间的隐式转换...
Error:(28, 21) value foreach is not a member of java.util.List[String] for(line <- lines){ 2.java.util.Set[String] Error:(24, 29) value foreach is not a member of java.util.Set[String] for (key <- reducedList.keySet) { ^ 3.java.util.ArrayList[Object] Error:(21, 22) ...
[error] /home/sumeet/SimpleSparkProject/src/main/scala/SimpleApp.scala:16: value toDF is not a member of org.apache.spark.rdd.RDD[Auction][error] val auction = ebay.toDF()[error] ^ import org.apache.spark.SparkContextimport org.apache.spark.SparkContext._import org.apac...
importscala.collection.immutable.Mapimportorg.apache.spark.SparkContextobjectReduceByKeyExample{defmain(args:Array[String]):Unit={// 创建一个Map对象valdata=Map("key1"->1,"key2"->2,"key3"->3,"key4"->4,"key5"->5)// 使用reduceByKey方法对Map进行操作valresult=data.reduceByKey((a,b)=...
<console>:9: error: value +=is not a member of scala.collection.immutable.Set[S tring] people+= "Bob" ^ 然而如果people声明为var,而不是val,那么集合就可以用+=操作完成“更新”,尽管它是不可变类型的。首先,新创建集合;然后,people将被重新赋值为新集合: ...
value toDF is not a member of org.apache.spark.rdd.RDD 2017-10-23 23:03 −idea显示toDF() 没有这个函数,显示错误: ``` Error:(82, 8) value toDF is not a member of org.apache.spark.rdd.RDD[com.didichuxing.scala.BaseIndex] possible cause: may... ...
[ERROR] [Error] C:/Users/nicol/git/scala-ide/org.scala-ide.sdt.core/src/org/scalaide/core/internal/compiler/ScalaPresentationCompiler.scala:86: value lookup is not a member of this.Context The method is used here: https://github.com/scala-ide/scala-ide/blob/master/org.scala-ide.sdt.co...
// 定义Int类型scala>vala=12345a:Int=12345// Int类型没有 length 方法scala>a.length<console>:13:error:valuelengthisnotamemberofInta.length^// 定义隐式转换函数 (Int)=>Stringscala>implicitdefint2string(a:Int)=a.toStringwarning:therewasonefeaturewarning;re-runwith-featurefordetailsint2string:(a...
<console>:93: error: value _1 is not a member of scala.collection.mutable.HashMap[String,Int] val docIds = docTermFreqs.map(_._1).zipWithUniqueId().map(_.swap).collectAsMap() The code in the book doesn't define any variables called docId...
scala>vals=Set(1,2,3)s:scala.collection.immutable.Set[Int]=Set(1,2,3)scala>s+=4<console>:13:error:value+=isnotamemberofscala.collection.immutable.Set[Int]Expressiondoesnotconverttoassignmentbecausereceiverisnotassignable.s+=4^scala>s+4res8:scala.collection.immutable.Set[Int]=Set(1,2,3,...