object Main extends App {
	class Parent {
		def entry(): Unit =
			// this is a virtual dispatch, so it can invoke different
			// implementation of "printer" method than println("I'm Parent")
			// `this` reference is of type Parent, but real type can be Child
			this.printer() 
 
		def printer(): Unit =
			println("I'm Parent")
	}
 
	class Child extends Parent {
		override def printer(): Unit =
			println("I'm Child")
	}
 
	new Child().entry()
}
 

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