Error:(13,17) not enough argumentsformethod sorted: (implicitord: scala.math.Ordering[U])List[U]. Unspecified value parameter ord. dataset.sorted 代码需要添加隐式参数: def bubbleSortStrategy[U](dataset: List[U]) (implicitord: Ordering[U]): List[U] ={ println("sort in bubble") dataset....
Unspecified value parameters name, age. val s = new Student ^ scala> val s = new Student("jom",23) your name is jom,your age is 23 s: Student = Student@2d70f312 //给默认值 scala> :paste // Entering paste mode (ctrl-D to finish) class Student(val name:String="leo",val age:...
Unspecified value parameters name, age. val s = new Student ^ scala> val s = new Student("leo", 30) your name is leo, your age is 30 s: Student = Student@60cdee08 主construntor中还可以通过使用默认参数,来给参数默认的值。 scala> class Student(val name:String="leo", val age:Int=...
<console>:12: error: not enough argumentsforconstructorStudent: (name: String, age:Int)Student. Unspecified value parameters name, age.vals = new Student ^ scala>vals = new Student("jom",23) your nameisjom,your ageis23s: Student =Student@2d70f312//给默认值scala> :paste// Entering paste...
package chapter3 object ImplicitParameters extends App { class Wifi(name: String) { override def toString: String = name } // 函数定义者首先需要把参数标记为implicit,那么就像有默认值的参数了,该参数的值传递是可选的 // 如果没有传值,Scala会在调用的作用域中寻找一个隐式变量,这个隐式变量必须和相...
Unspecified value parameters from, until. val view = arr.slice() ^ scala> val view = arr.slice(1,10) view: Array[Int] = Array(2, 3, 4, 5, 6, 7, 8, 9, 10) scala> val view = arr.slice(1,9) view: Array[Int] = Array(2, 3, 4, 5, 6, 7, 8, 9) ...
RecordCodecdeserializes POJOs and record classes that are specified as type parameters ofListorMapfields to the proper record and POJO types. Previously, this codec deserialized them asDocumentvalues. For example, the following record class definitions show aBookrecord that contains aListthat receives ...
问scala的Collectors.groupingBy()替代方案EN在Java中，我有如下内容：在本系列第二部分中，Noam 提出了...
但前提是你必须使用repmgrd ，每个节点都需要运行这个程序（如果你不知道什么是repmgrd 请参看之前的文字...
// As with Python, non-named parameters need to be supplied before named o scala> make_arr("orange", drink="coffee", "banana") <console>:19: error: not enough arguments for method make_arr: (x: Unspecified value parameter y. make_arr("orange", drink="coffee", "banana")...