Scala – Nested Classes
In Scala, nesting can be done just about anything inside anything. functions can be define inside other functions, and classes inside other classes. Here are some simple examples.
use case 1:
scala> class eduprwa {
class Member(val name: String) {
val course = new ArrayBuffer[Member]
}
private val members = new ArrayBuffer[Member]
def join(name: String) = {
val m = new Member(name)
members += m
m
}
}
class eduprwa
scala> val BigData = new eduprwa
2scala> val DataScience = new eduprwa
scala> val Hadoop = new eduprwa
//In our eduprwa example, you can add a member within its own eduprwa, but not across networks.
use case 2:
scala> import scala.collection.mutable.ArrayBuffer
scala> class prwatech{
class Member(val name: String){
val contacts = new ArrayBuffer[Member]
}
private val members = new ArrayBuffer[Member]
def join(name: String) = {
val m = new Member(name)
members +=m
m
}
}
Scala>val a1 = new prwatech
scala> val b1 = new prwatech
2scala> val fruit = a1.join(“Fruit”)
scala> val wolf = a1.join(“Wolf”)
3scala> fruit.contacts += wolf
scala> val beer = b1.join(“Beer”)
4scala> a1.contacts += beer
use case 3:
scala> class Animal{
class Member(val name: String){
val contacts = new ArrayBuffer[Member]
}
private val members = new ArrayBuffer[Member]
def join(name: String) = {
val m = new Member(name)
members +=m
m
}
}
scala> val petanimal = new Animal
2scala> val wildanimal = new Animal
scala> val cat = petanimal.join(“Cat”)
3scala> val dog = petanimal.join(“Dog”)
scala> cat.contacts += dog
4scala> val lion = wildanimal.join(“Lion”)
scala> cat.contacts += lion
