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  1. object Main extends App {
  2. 	object MySingleton {
  3.  	def foo = 19
  4.  }
  5.  
  6.  val a = MySingleton
  7.  val b = MySingleton
  8.  
  9. println(a == b)  //object equality
  10. println(a eq b)  //ref equality
  11.  
  12. println(MySingleton.foo)
  13. println(a.foo)
  14. println(b.foo)
  15.  
  16. val c:MySingleton.type = MySingleton
  17.  
  18. class Employee(private val eid:String, val firstName:String, val lastName:String) extends AnyRef {
  19.  
  20.  	require (eid.nonEmpty, "EID cannot be blank")  //Precondition, throw IllegalArgumentException
  21.  	require (firstName.nonEmpty, "firstName cannot be blank") 
  22.  	require (lastName.nonEmpty, "lastName cannot be blank") 
  23.  
  24.  	def this(firstName:String, lastName:String) = this("000-00-0000", firstName, lastName)
  25.  
  26.  	def this(firstName:String) = this(firstName, "Unknown")
  27.  
  28.  	def this() = this("Unknown")
  29.  
  30.  	override def toString = s"Employee($firstName, $lastName)"
  31.  
  32.  }
  33.  
  34.  
  35.  class Manager(firstName:String, lastName:String, val employee:List[Employee])
  36.  	extends Employee(firstName, lastName)
  37.  
  38.  
  39.  object Employee {
  40.  	def create3WithSameName(firstName:String, lastName:String):List[Employee] = {
  41.  		List(new Employee(firstName, lastName),
  42.  			new Employee(firstName, lastName),
  43. 			new Employee(firstName, lastName))
  44.  	}
  45.  
  46.  	def retrieveSecretInfo(x:Employee) = {
  47.  		x.eid
  48.  	}
  49.  }
  50.  
  51.  println(Employee.create3WithSameName("Diane", "Sawyer"))
  52.  
  53.  println(Int.MinValue)
  54.  
  55.  val d = new Employee("100-00-1029", "Laura", "Bocelli")
  56.  
  57.  //println(d.eid)  //doesn't work
  58.  
  59. println(Employee.retrieveSecretInfo(d))
  60.  
  61. class Foo(x:Int) {
  62.  
  63. 	def apply(y:Int) = x + y
  64. }
  65.  
  66. val foo = new Foo(18)
  67. println(foo.apply(30))
  68. println(foo(30))
  69.  
  70. val list = List(1,2,3,4,5,6)
  71. val list2 = List.apply(1,2,3,4,5,6)  //If you don't see a new, look in the companion object
  72.  
  73. val item2 = list(1)
  74. val item2alternate = list.apply(1)
  75.  
  76.  
  77.  
  78.  
  79. }
Success #stdin #stdout 0.39s 323264KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
true
true
19
19
19
List(Employee(Diane, Sawyer), Employee(Diane, Sawyer), Employee(Diane, Sawyer))
-2147483648
100-00-1029
48
48
https://ideone.com/i8t6gJ
language:
Scala (scala 2.12.8)
created:
8 years ago
visibility:
public

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