fresedoelpibe on scala traits vs abstract classes

core-scala/src/main/scala/com/baeldung/scala/TraitsAndAbstractClasses.scala

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+package com.baeldung.scala
+
+object TraitsAndAbstractClasses {
+ def main(args: Array[String]): Unit = {
+// val shape = new Shape() // won't compile, Shape is an abstract class
+// val calc = new Calculable() // won't compile, Calculable is a trait
+ val dog = new Dog()
+ println(dog.sound)
+ }
+
+ abstract class Employee(id: String)
+
+ class Intern(id: String, duration: Int) extends Employee(id)
+
+ class Dog {
+ def sound = "bark"
+ }
+
+ abstract class Shape {
+ def area: Double
+ }
+
+ trait Calculable {
+ def integral: Double
+ }
+
+ trait Dimensioned {
+ val dimensions: Int
+ }
+
+ class Cube(side: Double) extends Calculable with Dimensioned {
+ override def integral: Double = side * side * side
+
+ override val dimensions: Int = 2
+ }
+
+ class Sphere(radius: Double) extends Shape {
+ override def area: Double = 4 * Math.PI * radius * radius
+ }
+
+ object RedCylinder extends Dimensioned {
+ override val dimensions: Int = 2
+ }
+}