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Generics

What are generics?​

package com.knowbasics

object AboutGenerics extends App {

  class Person {
    def apply(): String = "This is apply definition of class"
    def gender(): String = ???
  }
  class Man extends Person
  class Woman extends Person

  /* COVARIANCE
  1. In below People class the A is genric that represent another class type
  2. While instantiating it expects a defined class in type
  3. It would accept any class that derived from the class A in value part
   */
  class AllPeople[+A]
  val females: AllPeople[Person] = new AllPeople[Woman]
  val males: AllPeople[Person] = new AllPeople[Man]
  val allPeople: AllPeople[Person] = new AllPeople[Person]

}