Add multiple array values to a list is possible in scala?

Question

How to add array values a & b (multiple values) to List list1

  var list1:java.util.List[Array[String]]=List[Array[String]]()

  var a=Array[String]("Excellent","Good","Need To Improve")

  var b=Array[String]("1","2","3")

  list1.add(a)
  list1.add(b)

I tried this but the Array values not add to the List

The array values not add to list

Your first line does not compile because you are mixing two kinds of Lists. Did you mean to use a scala List or a Java List? — dhg
– dhg, Commented Dec 5, 2013 at 7:45

Andrzej Jozwik · Accepted Answer · 2013-12-05 12:05:53Z

2

There are two possiblities for java.util.ArrayList (which is mutable):

scala> val list = new java.util.ArrayList[Array[String]]()
list: java.util.ArrayList[Array[String]] = []


scala> var a=Array[String]("Excellent","Good","Need To Improve")
a: Array[String] = Array(Excellent, Good, Need To Improve)

scala>  var b=Array[String]("1","2","3")
b: Array[String] = Array(1, 2, 3)

scala> list.add(a)
res8: Boolean = true

scala> list.add(b)
res9: Boolean = true

scala> list
res10: java.util.ArrayList[Array[String]] = [[Ljava.lang.String;@4786b9ce, [Ljava.lang.String;@5e10a811]

Or for scala List (immutable) - you have reassign list :

scala> var list = List[Array[String]]()
list: List[Array[String]] = List()

scala> list = b :: a :: list
list: List[Array[String]] = List([Ljava.lang.String;@5e10a811, [Ljava.lang.String;@4786b9ce)

answered Dec 5, 2013 at 12:05

Andrzej Jozwik

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