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Interview :: Scala

61) What are case classes in Scala?

Scala case classes are just regular classes which are immutable by default and decomposable through pattern matching. It uses the equal method to compare instance structurally. It does not use the new keyword to instantiate the object.

Example

 case class CaseClass(a:Int, b:Int)  object MainObject{     def main(args:Array[String]){         var c =  CaseClass(10,10)       // Creating object of case class         println("a = "+c.a)               // Accessing elements of case class         println("b = "+c.b)     } } 

62)

What is file handling in Scala?

File handling is a mechanism for handling file operations. Scala provides predefined methods to deal with the file. You can create, open, write and read the file. Scala provides a complete package scala.io for file handling.

Example

 import scala.io.Source  
object MainObject{  
  def main(args:Array[String]){  
    val filename = "ScalaFile.txt"  
    val fileSource = Source.fromFile(filename)  
    for(line<-fileSource.getLines){  
      println(line)  
    }  
    fileSource.close()  
  }  
} 

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