Aggiunte classi Scala da altro progetto

.idea/compiler.xml

@@ -2,14 +2,15 @@
 <project version="4">
   <component name="CompilerConfiguration">
     <annotationProcessing>
+      <profile default="true" name="Default" enabled="true" />
       <profile name="Maven default annotation processors profile" enabled="true">
         <sourceOutputDir name="target/generated-sources/annotations" />
         <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
         <outputRelativeToContentRoot value="true" />
+        <module name="modern-java" />
         <module name="functional-programming-java" />
         <module name="modernjava" />
         <module name="scala" />
-        <module name="modern-java" />
       </profile>
     </annotationProcessing>
     <bytecodeTargetLevel>
@@ -17,7 +18,7 @@
       <module name="functional-programming-java" target="8" />
       <module name="modern-java" target="9" />
       <module name="modernjava" target="9" />
-      <module name="scala" target="1.5" />
+      <module name="scala" target="8" />
     </bytecodeTargetLevel>
   </component>
 </project>

.idea/encodings.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/functional-programming-java/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/modern-java/src/main/java" charset="UTF-8" />
+  </component>
+</project>

.idea/jarRepositories.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://repo.maven.apache.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="scala-tools.org" />
+      <option name="name" value="Scala-Tools Maven2 Repository" />
+      <option name="url" value="http://scala-tools.org/repo-releases" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+  </component>
+</project>

.idea/scala_settings.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ScalaProjectSettings">
+    <option name="ignorePerformance" value="true" />
+  </component>
+</project>

pom.xml

@@ -9,6 +9,10 @@
     <packaging>pom</packaging>
     <version>1.0</version>
 
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
     <modules>
         <module>scala</module>
         <module>modern-java</module>

scala/pom.xml

@@ -7,6 +7,8 @@
 	<version>1.0</version>
 
 	<properties>
+		<maven.compiler.source>8</maven.compiler.source>
+		<maven.compiler.target>8</maven.compiler.target>
 		<scala.version>2.13.0</scala.version>
 	</properties>
 

scala/src/main/scala/org/gym/fp/Device.scala

@@ -0,0 +1,32 @@
+package org.gym.fp
+
+abstract class Device
+
+case class Phone(model: String) extends Device {
+  def screenOff = "Turning screen off"
+}
+
+case class Computer(model: String) extends Device {
+  def screenSaverOn = "Turning screen saver on..."
+}
+
+object DeviceTest {
+
+  private def newLine = println()
+
+  def main(args: Array[String]): Unit = {
+    println("TEST 1")
+    val p = Phone("Samsung Galaxy S8 Edge")
+    val c = Computer("Alienware")
+    println(goIdle(p))
+    println(goIdle(c))
+    newLine
+  }
+
+  def goIdle(device: Device) = {
+    device match {
+      case p: Phone => p.screenOff
+      case c: Computer => c.screenSaverOn
+    }
+  }
+}

scala/src/main/scala/org/gym/fp/Exercise.scala

@@ -0,0 +1,358 @@
+package org.gym.fp
+
+import org.gym.fp.model.Rational
+
+import scala.annotation.tailrec
+
+class Exercise {
+
+  private def newLine = println()
+
+  //es. 1
+  def mcd(x: Int, y: Int): Int = if (y == 0) x else mcd(y, x % y)
+
+  //es. 2
+  def sommeQuad(x: Int, y: Int): Int = if (x > y) 0 else x * x + sommeQuad(x + 1, y)
+
+  //es. 3
+  def sqrt(x: Double) = {
+    val epsilon = 0.000000000001
+
+    def abs(x: Double) = if (x < 0) -x else x
+
+    def firstPrev(y: Double, x: Double) = abs(y * y - x) < epsilon
+
+    def secondPrev(y: Double, x: Double) = (y + x / y) / 2.0
+
+    def bestSqrt(y: Double, x: Double): Double =
+      if (firstPrev(y, x)) y else bestSqrt(secondPrev(y, x), x)
+
+    bestSqrt(1.0, x)
+  }
+
+  // f(g(x)) es. 4
+  def componi(f: Int => Int, g: Int => Int) = g.andThen(f)
+
+  //es. 5
+  def somma(f: Int => Int): (Int, Int) => Int = {
+    def g(a: Int, b: Int): Int = if (a - b > 0) 0 else f(a) + g(a + 1, b)
+
+    g
+  }
+
+  // es. 6
+  def applicaDueVolte(f: Int => Int, x: Int) = componi(f, f)(x)
+
+  // es. 9
+  def primo(n: Int): Boolean = {
+    val sqrt = Operation.sqrt(n.doubleValue()).intValue();
+    var result = true
+
+    if (n == 2) {
+      result = false
+    }
+
+    for (i <- 2 to sqrt) {
+      if (n % i == 0) {
+        result = false
+      }
+    }
+    result
+  }
+
+  //es. 10
+  def fib(n: Int): Int =
+    if (n == 0) 0 else if (n == 1) 1 else fib(n - 1) + fib(n - 2)
+
+  //es. 11
+  def sommaQuadRic(a: Int, b: Int): Int = {
+    @tailrec
+    def somma(a: Int, b: Int, acc: Int): Int =
+      if (a - b > 0) acc else somma(a + 1, b, (a * a) + acc)
+
+    somma(a, b, 0)
+  }
+
+  def sommaQuadList(a: Int, b: Int) = List.range(a, b + 1).map(x => x * x).reduce(_ + _)
+
+  //es. 12
+  def funcEqual(f1: Int => Int, f2: Int => Int, n: Int): Boolean =
+    if (n >= 0) f1(n) == f2(n) else f1(n) == f2(n) && funcEqual(f1, f2, n - 1)
+
+  //es. 13 TODO NON SI CAPISCE IL RISULTATO DEL ESERCIZIO
+  def concatena(f1: Double => Double, f2: Double => Double, f3: Double => Double, a: Double, b: Double) = ???
+
+  //es. 14
+  def maxLength(strings: List[String]) =
+    strings.map(s => s.length()).reduce((s1, s2) => if (s1 > s2) s1 else s2)
+
+  //es. 15
+  def equal(l1: List[Int], l2: List[Int]): Boolean =
+    if (l1.isEmpty && !l2.isEmpty || !l1.isEmpty && l2.isEmpty)
+      false
+    else if (l1.isEmpty && l2.isEmpty)
+      true
+    else
+      l1.head == l2.head && equal(l1.tail, l2.tail)
+
+  //es. 16
+  def filter(l: List[Int], predicate: Int => Boolean): List[Int] = {
+    @tailrec
+    def innerFilter(l: List[Int], predicate: Int => Boolean, acc: List[Int]): List[Int] =
+      if (l.isEmpty) acc else innerFilter(l.tail, predicate, if (predicate(l.head)) l.head :: acc else acc)
+
+    innerFilter(l, predicate, List()).sorted
+  }
+
+  //es. 17
+  def minMaxRic(l: List[Int]): (Int, Int) = {
+    @tailrec
+    def min(l: List[Int], m: Int): Int = if (l.isEmpty) m else min(l.tail, if (l.head < m) l.head else m)
+
+    @tailrec
+    def max(l: List[Int], m: Int): Int = if (l.isEmpty) m else max(l.tail, if (l.head > m) l.head else m)
+
+    (min(l, Int.MaxValue), max(l, Int.MinValue))
+  }
+
+  def minMaxList(l: List[Int]): (Int, Int) = {
+    val min = l.reduce((a, b) => if (a < b) a else b)
+    val max = l.reduce((a, b) => if (a > b) a else b)
+    (min, max)
+  }
+
+  def minMaxList2(l: List[Int]): (Int, Int) = (l.min, l.max)
+
+  //es. 18
+  def mediaVeicoli(l: List[Int]): Double =
+    l.span(v => v > 0)._1.foldLeft(0)(_ + _).toDouble / l.span(v => v > 0)._1.foldLeft(0.0)((r, c) => r + 1)
+
+  //es. 19
+  def allDistinct[T <% Ordered[T]](l: List[T]): Boolean = l.size == l.distinct.size
+
+  //es. 20 TODO NON SI CAPISCE IL RISULTATO DEL ESERCIZIO
+  def inferiori(l: List[Int]): List[(Int, Int)] = ???
+
+  //es. 21
+  def find[T](x: T, l: List[T]): Boolean = l.find(x == _).getOrElse(None) != None
+
+  //es. 22
+  def removeDuplicates[T](l: List[T]): List[T] = l.distinct
+
+  //es. 23
+  def union[T](l1: List[T], l2: List[T]): List[T] = l1.union(l2).distinct
+
+  //es. 24
+  def intersection[T](l1: List[T], l2: List[T]): List[T] = l1.intersect(l2).distinct
+
+  //es. 31
+  def forComprehension() = {
+    case class Studente(val nome: String, val eta: Int, val esami: List[String])
+
+    val q = List(
+      Studente("Marco", 23, List("PFP", "SC")),
+      Studente("Laura", 19, List("SC", "FI1", "PFP")),
+      Studente("Stefano", 23, List("SC", "FI1")),
+      Studente("Marco", 25, List("SC", "FI1", "FI2")),
+      Studente("Paola", 22, List("SC", "PFP"))
+    )
+
+    // estrarre tutti gli studenti con eta compresa tra 20 e 24 anni (inclusi) che hanno sostenuto l'esame di "PFP"
+    val query1 = for {
+      s <- q
+      if (s.eta >= 20 && s.eta <= 24 && s.esami.contains("PFP"))
+    } yield s;
+    // stampare i dati degli studenti in query1
+    println("Studenti dai 20 ai 24 anni con esame PFP: ")
+    query1 foreach println
+    newLine
+
+    // estrarre tutti gli studenti con eta strettamente inferiore a 24 anni che hanno sostenuto almeno due esami
+    val query2 = for {
+      s <- q
+      if (s.eta < 24 && s.esami.size >= 2)
+    } yield s;
+    // stampare i dati degli studenti in query2
+    println("Studenti minori di 24 anni con almeno 2 esami: ")
+    query2 foreach println
+  }
+
+  //es. 33
+  def repeat(times: Int)(statement: => Unit) = for (i <- 1 to times) statement
+
+  //es. 34
+
+  // Versione imperativa di prova
+  //    def vecprod(v1: Array[Double], v2: Array[Double]) = {
+  //        require(v1.size == v2.size)
+  //        var sp = 0.0
+  //        var i = 0
+  //        while (i < v1.size) {
+  //            sp += v1(i) * v2(i)
+  //            i += 1
+  //        }
+  //        sp
+  //    }
+
+  def vecprod(v1: Array[Double], v2: Array[Double]) = {
+    require(v1.size == v2.size)
+    v1.zip(v2).map(t => t._1 * t._2).reduce(_ + _)
+  }
+
+  def executeAllTests() = {
+
+    //es. 1
+    println("Esercizio 1")
+    println("Minimo comune denominatore tra 5 e 15 = " + mcd(5, 15))
+    newLine
+
+    //es. 2
+    println("Esercizio 2")
+    println("sommatoria dei quadrati da 1 a 3 = " + sommeQuad(1, 3)) // stampa 14 (somma dei quadrati di 1, 2 e 3)
+    newLine
+
+    //es. 3
+    println("Esercizio 3")
+    println("Radice quadrata di 2 ~ " + sqrt(2))
+    newLine
+
+    // f(g(x)) es.4
+    println("Esercizio 4")
+    val f = componi(x => x * x, x => x + 1)
+    println("f(g(x) / f(x) = x * x e g(x) = x + 1 := " + f(9)) // stampa 100
+    newLine
+
+    //es.5
+    println("Esercizio 5")
+    val sommaQuadrati = somma(x => x * x)
+    println("sommatoria dei quadrati da 1 a 3 = " + sommaQuadrati(1, 3)) // stampa 14 (somma dei quadrati di 1, 2 e 3)
+    newLine
+
+    //es.6
+    println("Esercizio 6")
+    println("10 + 1 + 1 = " + applicaDueVolte(x => x + 1, 10)) // stampa 12
+    newLine
+
+    //es.9
+    println("Esercizio 9")
+    println("primo(3) = " + primo(3)) // true
+    println("primo(2) = " + primo(2)) // false
+    newLine
+
+    //es.10
+    println("Esercizio 10")
+    println("fib(20) = " + fib(20))
+    newLine
+
+    //es.11
+    println("Esercizio 11")
+    println("sommatoria dei quadrati da 1 a 3 = " + sommaQuadRic(1, 3)) //14
+    println("sommatoria dei quadrati da 1 a 3 = " + sommaQuadList(1, 3)) //14
+    newLine
+
+    //es.12
+    println("Esercizio 12")
+    println(funcEqual(x => x * x, x => x * x, 4)) // true
+    println(funcEqual(x => x * x, x => x + 1, 4)) // false
+    newLine
+
+    //es. 14
+    println("Esercizio 14")
+    println(maxLength(List("ciao", "famiglia", "supercalifragilistichespiralidoso"))) // 33
+    newLine
+
+    //es. 15
+    println("Esercizio 15")
+    println(equal(List(1, 2, 3), List(1, 2, 3))) // true
+    println(equal(List(1, 2, 3), List(1, 2, 3, 4))) // false
+    println(equal(List(1, 2, 3, 4), List(1, 2, 3))) // false
+    newLine
+
+    //es. 16
+    println("Esercizio 16")
+    val l = List(3, 1, 2, 4, 5)
+    println(filter(l, _ > 2)) // stampa 3,4,5
+    newLine
+
+    //es. 17
+    println("Esercizio 17")
+    println("Versione ricorsiva: " + minMaxRic(List(10, 2, 3, 6)))
+    println("Versione con metodi standard: " + minMaxList(List(10, 2, 3, 6)))
+    newLine
+
+    //es. 18
+    println("Esercizio 18")
+    println("La media e' = " + mediaVeicoli(List(4, 8, 4, 8, 4, 4, 4, 4, -1, 77, 88, 99))) // 5
+    newLine
+
+    //es. 19
+    println("Esercizio 19")
+    println(allDistinct(List(1, 2, 3, 4, 5))) // true
+    println(allDistinct(List(4, 8, 4, 8, 4, 4, 4, 4, -1, 77, 88, 99))) // false
+    newLine
+
+    //es. 20
+    println("Esercizio 20")
+    //println(inferiori(List(1,3,1,2,2,1))) // deve restituire List((1,0), (2,3), (3,5))
+    newLine
+
+    //es. 21
+    println("Esercizio 21")
+    println(find(2, List(3, 1, 2, 4, 5))) // true
+    println(find(20, List(3, 1, 2, 4, 5))) // false
+    newLine
+
+    //es. 22
+    println("Esercizio 22")
+    println(removeDuplicates(List(1, 2, 3, 4, 4, 5))) // List(1, 2, 3, 4, 5)
+    println(removeDuplicates(List(4, 8, 4, 8, 4, 4, 4, 4, -1, 77, 88, 99))) // List(4, 8, -1, 77, 88, 99)
+    newLine
+
+    //es. 23
+    println("Esercizio 23")
+    println(union(List(1, 2, 3, 4, 4, 5), List(4, 8, 4, 8, 4, 4, 4, 4, -1, 77, 88, 99))) // List(1, 2, 3, 4, 5, 8, -1, 77, 88, 99)
+    newLine
+
+    //es. 24
+    println("Esercizio 24")
+    println(intersection(List(1, 2, 3, 4, 4, 5), List(4, 8, 4, 8, 4, 4, 4, 4, 5, -1, 77, 88, 99))) // List(4, 5)
+    newLine
+
+    //es. 25
+    println("Esercizio 25")
+    val r1 = new Rational(2, 7)
+    val r2 = new Rational(8, 6)
+    val r3 = new Rational(4, 14)
+    val r4: Rational = 1.0 / 2.0
+    val r5: Rational = 5
+    println(r1 + r2) // stampa 34/21
+    println(r1 - r2) // stampa -22/21
+    println(r1 * r2) // stampa 8/21
+    println(r1 / r2) // stampa 3/14
+    println(r1 == r3) // stampa true
+    println(r1 != r2) // stampa true
+    println(r1 < r2) // stampa true
+    println(r2 < r1) // stampa false
+    println(r4)
+    println(r5)
+    newLine
+
+    //es. 31
+    println("Esercizio 31")
+    forComprehension()
+    newLine
+
+    //es. 33
+    println("Esercizio 33")
+    repeat(3) {
+      println("ciao")
+    }
+    newLine
+
+    //es. 34
+    println("Esercizio 34")
+    println(vecprod(Array(1.0, 2.0, 3.0, 4.0, 5.0), Array(6.0, 7.0, 8.0, 9.0, 10.0))) // 130.0
+    newLine
+  }
+
+}

scala/src/main/scala/org/gym/fp/Furniture.scala

@@ -0,0 +1,21 @@
+package org.gym.fp
+
+sealed abstract class Furniture
+
+case class Couch() extends Furniture
+
+case class Chair() extends Furniture
+
+object FurnitureTest {
+  def main(args: Array[String]): Unit = {
+    val a = Couch
+    val b = Chair
+  }
+
+  def findPlaceToSit(piece: Furniture) = {
+    piece match {
+      case a: Couch => "Lie on the couch"
+      case b: Chair => "Sit on the chair"
+    }
+  }
+}

scala/src/main/scala/org/gym/fp/Main.scala

@@ -0,0 +1,22 @@
+package org.gym.fp
+
+object Main {
+
+  def main(args: Array[String]): Unit = {
+    //		val t = new Test
+    //		println("TEST 1")
+    //		t.test1()
+    //		println("TEST 2")
+    //		t.test2()
+    //		println("TEST 3")
+    //		t.test3()
+    //		println("TEST 4")
+    //		t.test4()
+    //		println("TEST 5")
+    //		t.test5()
+    println("ESERCIZI")
+    val e: Exercise = new Exercise
+    e.executeAllTests()
+  }
+
+}

scala/src/main/scala/org/gym/fp/Model2D.scala

@@ -0,0 +1,18 @@
+package org.gym.fp
+
+import org.gym.fp.model.{Frame2D, Line}
+
+object Model2D {
+
+  def getGrid(n: Int) = {
+
+    // completare costruzione di un modello 2D di una griglia con n linee verticali ed n linee orizzontali
+    List(new Line(0.0, 0.0, 1.0, 1.0)) // esempio di linea
+  }
+
+  def main(args: Array[String]) {
+    println("Displaying 20x20 grid...")
+    Frame2D.display(Model2D.getGrid(20), 500, 500)
+  }
+
+}

scala/src/main/scala/org/gym/fp/Notification.scala

@@ -0,0 +1,73 @@
+package org.gym.fp
+
+abstract class Notification
+
+case class Email(sender: String, title: String, body: String) extends Notification
+
+case class SMS(caller: String, message: String) extends Notification
+
+case class VoiceRecording(contactName: String, link: String) extends Notification
+
+class NotificationTest() {
+  def showNotification(notification: Notification): String = {
+    notification match {
+      case Email(email, title, _) =>
+        s"You got an email from $email with title: $title"
+      case SMS(number, message) =>
+        s"You got an SMS from $number! Message: $message"
+      case VoiceRecording(name, link) =>
+        s"You received a Voice Recording from $name! Click the link to hear it: $link"
+    }
+  }
+
+  def showImportantNotification(notification: Notification, importantPeopleInfo: Seq[String]): String = {
+    notification match {
+      case Email(email, _, _) if importantPeopleInfo.contains(email) =>
+        "You got an email from special someone!"
+      case SMS(number, _) if importantPeopleInfo.contains(number) =>
+        "You got an SMS from special someone!"
+      case other =>
+        showNotification(other) // nothing special, delegate to our original showNotification function
+    }
+  }
+}
+
+object NotificationTest {
+
+  private def newLine = println()
+
+  def main(args: Array[String]): Unit = {
+    val t = new NotificationTest
+
+    println("TEST 1")
+    test1(t)
+    newLine
+
+    println("TEST 2")
+    test2(t)
+    newLine
+  }
+
+  def test1(t: NotificationTest) = {
+    val someSms = SMS("12345", "Are you there?")
+    val someVoiceRecording = VoiceRecording("Tom", "voicerecording.org/id/123")
+
+    println(t.showNotification(someSms)) // prints You got an SMS from 12345! Message: Are you there?
+    println(t.showNotification(someVoiceRecording)) // you received a Voice Recording from Tom! Click the link to hear it: voicerecording.org/id/123
+  }
+
+  def test2(t: NotificationTest) = {
+    val importantPeopleInfo = Seq("867-5309", "jenny@gmail.com")
+
+    val someSms = SMS("867-5309", "Are you there?")
+    val someVoiceRecording = VoiceRecording("Tom", "voicerecording.org/id/123")
+    val importantEmail = Email("jenny@gmail.com", "Drinks tonight?", "I'm free after 5!")
+    val importantSms = SMS("867-5309", "I'm here! Where are you?")
+
+    println(t.showImportantNotification(someSms, importantPeopleInfo))
+    println(t.showImportantNotification(someVoiceRecording, importantPeopleInfo))
+    println(t.showImportantNotification(importantEmail, importantPeopleInfo))
+    println(t.showImportantNotification(importantSms, importantPeopleInfo))
+  }
+
+}

scala/src/main/scala/org/gym/fp/Operation.scala

@@ -0,0 +1,50 @@
+package org.gym.fp
+
+import scala.annotation.tailrec
+
+object Operation {
+
+  def abs(x: Double) = if (x < 0) -x else x
+
+  def add(a: Double)(b: Double) = a + b
+
+  def sub(a: Double)(b: Double) = a - b
+
+  def prod(a: Double)(b: Double) = a * b
+
+  def div(a: Double)(b: Double) = if (b != 0) a / b else 0
+
+  def inc(x: Double) = add(x)(1)
+
+  def dec(x: Double) = sub(x)(1)
+
+  def mcd(x: Int, y: Int): Int = if (y == 0) x else mcd(y, x % y)
+
+  def sqrt(x: Double) = {
+    val epsilon = 0.000000000001
+
+    def firstPrev(y: Double, x: Double) = abs(y * y - x) < epsilon
+
+    def secondPrev(y: Double, x: Double) = (y + x / y) / 2.0
+
+    def bestSqrt(y: Double, x: Double): Double =
+      if (firstPrev(y, x)) y else bestSqrt(secondPrev(y, x), x)
+
+    bestSqrt(1.0, x)
+  }
+
+  def pow(n: Double)(x: Double) = {
+    @tailrec
+    def p(n: Double, x: Double, a: Double): Double =
+      if (x == 0) a else p(n, x - 1, n * a)
+
+    p(n, x, 1)
+  }
+
+  def square(n: Double) = pow(n)(2)
+
+  def cube(n: Double) = pow(n)(3)
+
+  def percent(n: Double, p: Double) = if (p > 0 && n > 0) div(prod(n)(p))(100.0) else 0
+
+}

scala/src/main/scala/org/gym/fp/TestThread.scala

@@ -0,0 +1,14 @@
+package org.gym.fp
+
+object TestThread extends App {
+  val r = new Runnable {
+    def run() {
+      for (i <- 1 to 1000)
+        println(i)
+    }
+  }
+  val t = new Thread(r)
+  t.start()
+  for (i <- 5000 to 6000) println(i)
+  t.join()
+}

scala/src/main/scala/org/gym/fp/TestThread2.scala

@@ -0,0 +1,11 @@
+package org.gym.fp
+
+import org.gym.fp.model.Par.par
+
+object TestThread2 extends App {
+  par {
+    for (i <- 0 to 1000) println(i)
+  } {
+    for (i <- 5000 to 6000) println(i)
+  }
+}

scala/src/main/scala/org/gym/fp/db/Database.scala

@@ -0,0 +1,19 @@
+package org.gym.fp.db
+
+import org.gym.fp.model.Customer
+
+/**
+ * @author HP
+ */
+object Database {
+  var values = List(
+    new Customer("Luigi", 35),
+    new Customer("Marco", 14),
+    new Customer("Martina", 22),
+    new Customer("Fabrizio", 30),
+    new Customer("Flavia", 25),
+    new Customer("Kevin", 45),
+    new Customer("Antonio", 56),
+    new Customer("Giuseppe", 61),
+    new Customer("Cinzia", 55))
+}

scala/src/main/scala/org/gym/fp/model/Customer.scala

@@ -0,0 +1,3 @@
+package org.gym.fp.model
+
+case class Customer(val name: String, val age: Int)

scala/src/main/scala/org/gym/fp/model/Frame2D.scala

@@ -0,0 +1,60 @@
+package org.gym.fp.model
+
+import java.awt.{Dimension, EventQueue, Graphics, Graphics2D}
+
+import javax.swing.{JFrame, JPanel}
+
+object Frame2D {
+  def display(l: List[Shape], width: Int, height: Int) {
+    EventQueue.invokeLater(() => {
+      val ex = new Frame2D(l, width, height)
+      ex.setVisible(true)
+    })
+  }
+}
+
+class Frame2D(l: List[Shape], width: Int, height: Int) extends JFrame {
+
+  class Surface2D extends JPanel {
+
+    def doDrawCircle(c: Circle, g2d: Graphics2D) {
+      val xc = (width * (c.x - c.r)).toInt
+      val yc = height / 2 - (height * (c.y - c.r)).toInt
+      val wc = (2 * width * c.r).toInt
+      val hc = (2 * height * c.r).toInt
+      g2d.drawOval(xc, yc, wc, hc)
+    }
+
+    def doDrawLine(l: Line, g2d: Graphics2D) {
+      val x1 = (width * l.x1).toInt
+      val y1 = height - (height * l.y1).toInt
+      val x2 = (width * l.x2).toInt
+      val y2 = height - (height * l.y2).toInt
+      g2d.drawLine(x1, y1, x2, y2)
+    }
+
+    def doDrawing(g: Graphics) {
+      g match {
+        case g2d: Graphics2D =>
+          l foreach (_ match {
+            case c: Circle => doDrawCircle(c, g2d)
+            case l: Line => doDrawLine(l, g2d)
+          })
+      }
+    }
+
+    override def paintComponent(g: Graphics) {
+      super.paintComponent(g);
+      doDrawing(g);
+    }
+  }
+
+  val panel = new Surface2D()
+  panel.setPreferredSize(new Dimension(width, height))
+  add(panel);
+  setTitle("Shapes");
+  setResizable(false)
+  pack();
+  setLocationRelativeTo(null);
+  //setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+}

scala/src/main/scala/org/gym/fp/model/Par.scala

@@ -0,0 +1,13 @@
+package org.gym.fp.model
+
+object Par {
+  def par(statement1: => Unit)(statement2: => Unit) = {
+    val r = new Runnable {
+      override def run(): Unit = statement1
+    }
+    val t = new Thread(r)
+    t.start()
+    statement2
+    t.join()
+  }
+}

scala/src/main/scala/org/gym/fp/model/Pila.scala

@@ -0,0 +1,29 @@
+package org.gym.fp.model
+
+import scala.collection.mutable.ArrayBuffer
+
+class Pila[T] {
+  private var l: ArrayBuffer[T] = ArrayBuffer[T]()
+
+  def isEmpty(): Boolean = l.isEmpty
+
+  def push(elem: T): Unit = l.append(elem)
+
+  def pop(): T = {
+    if (isEmpty()) throw new IllegalArgumentException()
+    l.remove(0)
+  }
+
+  def top(): T = {
+    if (isEmpty()) throw new IllegalArgumentException()
+    l.last
+  }
+}
+
+object TestPila {
+  def main(args: Array[String]): Unit = {
+    var p: Pila[Int] = new Pila[Int]
+    for (i <- 1 to 10) p.push(i)
+    while (!p.isEmpty()) println(p.pop())
+  }
+}

scala/src/main/scala/org/gym/fp/model/Rational.scala

@@ -0,0 +1,52 @@
+package org.gym.fp.model
+
+import org.gym.fp.Operation.{mcd, pow}
+
+
+case class Rational(num: Int, den: Int) {
+
+  def +(other: Rational) =
+    Rational.minimize(Rational((this.num * other.den) + (this.den * other.num), this.den * other.den))
+
+  def -(other: Rational) =
+    Rational.minimize(Rational((this.num * other.den) - (this.den * other.num), this.den * other.den))
+
+  def *(other: Rational) =
+    Rational.minimize(Rational(this.num * other.num, this.den * other.den))
+
+  def /(other: Rational) =
+    Rational.minimize(Rational(this.num * other.den, this.den * other.num))
+
+  def >(other: Rational) = (this.num / this.den) > (other.num / other.den)
+
+  def <(other: Rational) = (this.num / this.den) < (other.num / other.den)
+
+  def >=(other: Rational) = (this.num / this.den) >= (other.num / other.den)
+
+  def <=(other: Rational) = (this.num / this.den) <= (other.num / other.den)
+
+  def ==(other: Rational) = (this.num / this.den) == (other.num / other.den)
+
+  def !=(other: Rational) = (this.num / this.den) != (other.num / other.den)
+
+  override def toString() = s"$num/$den"
+
+}
+
+object Rational {
+
+  private def minimize(r: Rational) =
+    if (r.num == 0) Rational(r.num, 1) else Rational(r.num / mcd(r.num, r.den), r.den / mcd(r.num, r.den))
+
+  implicit def doubleToRational(d: Double) = {
+    val len = String.valueOf(d).split("\\.")(1).length
+    val den = pow(10)(len).toInt
+    val num = (d * den).toInt
+    minimize(new Rational(num, den))
+  }
+
+  implicit def intToRational(i: Int) = {
+    minimize(new Rational(i, 1))
+  }
+
+}

scala/src/main/scala/org/gym/fp/model/Shape.scala

@@ -0,0 +1,7 @@
+package org.gym.fp.model
+
+abstract class Shape
+
+class Circle(val x: Double, val y: Double, val r: Double) extends Shape
+
+class Line(val x1: Double, val y1: Double, val x2: Double, val y2: Double) extends Shape