Carle, Susan D. (2003) "How Should We Theorize Class Interests in Thinking about Professional Regulation: The Early NAACP as a ...... much like another leading theoretical approach: Parsonian structural- functionalism. .... 1970s, Abel looks for ways
The greatest of richness is the richness of the soul. Prophet Muhammad (Peace be upon him)
Idea Transcript
Java Gladiator Home
Contact Us
SATURDAY, 7 OCTOBER 2017
ABOUT ME
Prithvipal Singh
How to define Auxiliary Constructor in case class in Scala
Follow
We have seen case class previously. We had discussed what is case class, how to create object of case class, list of boilerplate code generated for case class. If you don't know case class, I recommend to understand case class first.
View my complete profile
FACEBOOK
Let us revise case class declaration.
Java Gladiator 526 likes
case class Person(id:Int, name: String) Person class is declared with primary constructor where id and name are parameter. So good so far. The constructor which is not primary constructor, other than primary constructors and overloaded to primary constructor are called auxiliary constructor. How will you declare Auxiliary(other overloaded) constructors. What is syntax of creating auxiliary constructor. Please note that constructors in case class are not really constructor. Actually these are apply methods on companion object. Auxiliary constructor in case class are different than regular class. We can add auxiliary constructors in case class by adding apply() methods in companion object of case class.
Like Page Be the first of your friends to like this
Let us create 2 auxiliary constructor in below code -
Java Scenario Based Interview Scala
case class Person(id:Int, name: String)
Spring
object Person{ def apply(): Person = new Person(1, "EMPTY") def apply(id: Int): Person = new Person(id, "EMPTY") } We have created 2 auxiliary constructor. First does not take any parameter and second take one Int parameter. Both constructor are calling primary constructor. Now it is time to create object by calling these new constructors.
object TestMe { def main(args: Array[String]): Unit = { val person1 = Person() val person2 = Person(101) println(person1) println(person2) } } Output: Person(1,EMPTY) Person(101,EMPTY) Posted by Prithvipal Singh at 23:17 Labels: Scala