SCALA-601 Add example with different base and core traits

Author: Matteo Di Pirro

scala-core-modules/scala-core-8/src/main/scala/com/baeldung/scala/stackabletrait/StackableTraitWithExplicitBaseAndCoreExample.scala

@@ -0,0 +1,45 @@
+package com.baeldung.scala.stackabletrait
+
+object StackableTraitWithExplicitBaseAndCoreExample {
+  trait BaseIntTransformation {
+    def transform(value: Int): Int
+  }
+
+  trait CoreIntTransformation extends BaseIntTransformation {
+    def transform(value: Int): Int = value
+  }
+
+  trait DoubleTransformation extends CoreIntTransformation {
+    override def transform(value: Int): Int =
+      super.transform(value * 2)
+  }
+
+  trait LogInt extends CoreIntTransformation {
+    override def transform(value: Int): Int = {
+      println(s"Transforming value: $value")
+      super.transform(value)
+    }
+  }
+
+  trait CustomTransformation(f: Int => Int) extends CoreIntTransformation {
+    override def transform(value: Int): Int =
+      super.transform(f(value))
+  }
+
+  @main
+  def mainSTE(): Unit = {
+    val logAndDouble = new CoreIntTransformation
+      with DoubleTransformation
+      with LogInt {}
+    val doubleAndLog = new CoreIntTransformation
+      with LogInt
+      with DoubleTransformation {}
+    val logAndCustom = new CoreIntTransformation
+      with CustomTransformation(_ + 1)
+      with LogInt {}
+
+    println(s"Log and double: ${logAndDouble.transform(5)}")
+    println(s"Double and log: ${doubleAndLog.transform(5)}")
+    println(s"Log and increment: ${logAndCustom.transform(5)}")
+  }
+}