case class

CaseClass.scala

case class Person(name: String, age: Integer, favColor: String)

case class Person(name:String,age:Int = 0)

val p1 = Person("Rupesh",42)
val p2 = Person("Roopa")

case class Person(name:String,age:Option[Int] = Some(0))
val p1 = Person("Rupesh",Some(42))
val p2 = Person("Roopa")

println(p1)
println(p2)

  //Person(Rupesh,Some(42))
  //Person(Roopa,Some(0))

case class PersonRequire(
                            firstName:String,
                            lastName:String,
                            age:Int){
    require(firstName != "")
    require(lastName != "")
}

  try {
    val pr1 = PersonRequire("", "Raghavan", 42)
    println(pr1)
  } catch {
    case e:Throwable => println(e.getMessage)  // requirement failed
    e.printStackTrace()
  }
  //java.lang.IllegalArgumentException: requirement failed


case class Person(name:String,age:Option[Int] = Some(0))

val p1 = Person("Rupesh",Some(42))
val p2 = Person("Roopa")
val p3 = Person("Rhea",Some(5))
val p4 = Person("Reva",Some(3))

case class Friends(person:Person , friends:List[Person])

val friends1 = Friends(p1,List(p2,p3,p4))
val friends2 = friends1.copy()
val friends3 = friends2.copy(person = p2)
println(friends3)

//Friends(Person(Rupesh,Some(42)),List(Person(Roopa,Some(0)), Person(Rhea,Some(5)), Person(Reva,Some(3))))
//Friends(Person(Rupesh,Some(42)),List(Person(Roopa,Some(0)), Person(Rhea,Some(5)), Person(Reva,Some(3))))
//Friends(Person(Roopa,Some(0)),List(Person(Roopa,Some(0)), Person(Rhea,Some(5)), Person(Reva,Some(3))))