Scala中的mkString的具体使用方法

object Test {
 def main(args: Array[String]): Unit = {
 var name : String = "Hello LittleLawson"
 var age :Int = 2
 println(name.mkString)
 println(name.mkString(" "))//separate string with space

 var str0 = "scala"
 println(str0.mkString(","))//separate string with comma

 println(str0.mkString("begin",",","end"))

 /*
 1.mkString is used in the inner List,That is say ,Elements in the list is applied.
  */
 val a = List(1,2,3,4)
 val b = new StringBuilder()
 println(a.mkString("List(" , ", " , ")"))

 }
}

scala> val a = Array("apple", "banana", "cherry")
a: Array[String] = Array(apple, banana, cherry)

scala> a.mkString
res3: String = applebananacherry

scala> a.mkString(",")
res4: String = apple,banana,cherry

scala> a.mkString(" ")
res5: String = apple banana cherry

scala> a.mkString("[", ", ", "]")
res6: String = [apple, banana, cherry]

scala> val a = Array(Array("a", "b"), Array("c", "d"))
a: Array[Array[String]] = Array(Array(a, b), Array(c, d))

scala> a.flatten.mkString(",")
res7: String = a,b,c,d

scala> val v = Vector("apple", "banana", "cherry")
v: scala.collection.immutable.Vector[String] = Vector(apple, banana, cherry)

scala> v.toString
res8: String = Vector(apple, banana, cherry)