I am trying to understand the output which i got from below code, It shows some alpha numeric values prefix with @. how can i change it to ("Hello,world"),("How,are,you")
Scala Code:
val words = List("Hello_world","How_are_you" )
val ww= words.map(line=>line.split("_"))
println(ww)
output
List([Ljava.lang.String;@7d4991ad, [Ljava.lang.String;@28d93b30)
Add .toList
val ww = words.map(line=>line.split("_").toList)
// List(List(Hello, world), List(How, are, you))
ww == List(List("Hello", "world"), List("How", "are", "you")) // true
Otherwise ww is a List[Array[String]] rather than List[List[String]] and println shows hashcodes of arrays.
Or maybe you're looking for
val ww1 = words.map(_.replace("_", ","))
// List(Hello,world, How,are,you)
ww1 == List("Hello,world", "How,are,you") // true
.flatMap.
words.flatMap(line=>line.split("_").toList) produces List(Hello, world, How, are, you). But Op wanted ("Hello,world"),("How,are,you") whatever this means.To prettify Array printing consider ScalaRunTime.stringOf like so
import scala.runtime.ScalaRunTime.stringOf
println(stringOf(ww))
which outputs
List(Array(Hello, world), Array(How, are, you))
As explained by @Dmytro, Arrays are bit different from other Scala collections such as List, and one difference is they are printed as hashCode representations
public String toString() {
return getClass().getName() + "@" + Integer.toHexString(hashCode());
}
instead of value representations.
The output here is as expected. It just printed out the list with fully qualified name for the corresponding string with @ hashcode. Standard in most of the JVM languages.
Perhaps mkString is what you are looking for?
scala> val ww2 = words.map(line=>line.split("_").mkString(","))
ww2: List[String] = List(Hello,world, How,are,you)
scala> println(ww2)
List(Hello,world, How,are,you)
