Chapter3more.scala

package chapter3

import java.util.Date

/**
  * Created by hoshi on 1/13/16.
  */
object CallByName {
  def nano() = {
    println("Getting nano")
    System.nanoTime()
  }

  def notDelayed(t: Long) = {
    println("In not delayed method")
    println("Param:" + t)
    t
  }

  def delayed(t: => Long) = {
    println("In delayed method")
    println("Param:" + t)
    t
  }

  def main(args: Array[String]) {
    println("----")
    delayed(nano())
    println("----")
    notDelayed(nano())
    println("----")


    val d = new Date()
    println(d.getTime) // omit parentheses
    println(d toString) // omit dot
  }
}

----

package chapter3

/**
  * Created by hoshi on 1/13/16.
  */
object Car {
  def drive { println("Drive car")}
}

object AppTrait extends App {
  Car.drive
}

----

package chapter3

import java.util.Date

/**
  * Created by hoshi on 1/12/16.
  */
class CodeBlocks {
  def meth9() = "Hello World"
  def meth3():String = {"Moof"}
  def meth4():String = {
    val d = new Date()
    d.toString
  }

  val x3:String = {
    val d = new Date()
    d.toString
  }
}

object CodeBlockMain {
  def main(args: Array[String]) {
    val cb = new CodeBlocks
    println(cb.meth4)
    println(cb.x3)
  }
}

----

package chapter3

import scala.util.{Random => Rdm} // rename

/**
  * Created by hoshi on 1/13/16.
  */
trait Shape2 {
  def area: Double
}

object Shape2 {

  private class Circle(radius: Double) extends Shape2 {
    override val area = 3.14 * radius * radius
  }

  private class Rectangle(height: Double, length: Double) extends Shape2 {
    override val area = height * length
  }

  def apply(height: Double, length: Double): Shape2 = new Rectangle(height, length)

  def apply(radius: Double): Shape2 = new Circle(radius)
}

object Companion extends App {
  val circle = Shape2(2)
  println(circle.area)

  val rect = Shape2(2, 3)
  println(rect area)
  println(Rdm.nextInt)
}