CODEWITHSUNDEEP
scala
Srinivas
Srinivas

Reputation: 2100

How to access inner class elements in scala

I have a simple inner class variable, how do i access it in scala?

class Outer {
  class Inner {
    var x = 1
  }}


object Main {
  def main(args: Array[String]): Unit = {
    val o = new Outer
    val i = new o.Inner
    println(i.x)
  }
}

The problem is that IntelliJ complains that it cannot resolve x, but when i run the program it works fine.enter image description here

Upvotes: 0

Views: 2027

Answers (1)

prayagupadhyay
prayagupadhyay

Reputation: 31212

you can simply use .member_name to access variables in scala.

scala> class Outer {
        class Inner {
          var x = 1 //it can be val which is immutable
        }}
defined class Outer

scala> val o = new Outer
o: Outer = Outer@358b0b42

scala> val i = new o.Inner
i: o.Inner = Outer$Inner@512f2c7d

scala> i.x
res13: Int = 1

since your example has x defined as mutable, you can change the value of x,

scala> i.x = 100
i.x: Int = 100

scala> i.x
res14: Int = 100

See working example - https://scastie.scala-lang.org/prayagupd/C9k9an4ASdaISnohbYQBmA

If you don't really need Outer to be a class, you can define it as singleton, 

scala> object Outer {
     |             class Inner {
     |               var x = 1 //it can be val which is immutable
     |             }}
defined object Outer

then, simple instantiate Inner and access variables,

scala> val inner = new Outer.Inner
inner: Outer.Inner = Outer$Inner@4bcdd11

scala> inner.x
res2: Int = 1

Regarding not working on intellij, File | Invalidate Caches/Restart... should work

Upvotes: 1

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