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Scala traits sample code in Scala REPL

Following is a Scala traits sample code in Scala REPL:

$ scala

Welcome to Scala 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_77).

Type in expressions for evaluation. Or try :help.

scala>trait Car

defined trait Car


scala>trait SportCar {

| val brand:String

| def run():String = "Rghhhhh Rghhhhh Rghhhhh...."

| }

defined trait SportCar scala>

scala>trait Printable {

| def printIt:Unit

| }

defined trait Printable scala>

scala>class BMW extends Car with SportCar with Printable{

| override val brand = "BMW"

| override def printIt:Unit = println(brand + " does " + run() )

| }

defined class BMW scala>

scala>val x1 = new BMW x1: BMW = BMW@22a71081 scala>x1.printIt

BMW does Rghhhhh Rghhhhh Rghhhhh....


In the preceding code, we created multiple traits. One is called Car, which is the mother trait. Traits support inheritance as well, and we have it with the SportCar trait which extends from the Car trait. The SportCar trait demands a variable called brand, and defines a concrete implementation of the function run. Finally, we have a class called BMW which extends from multiple traits — this technique is called mixing.

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