Query regarding ArrayBuffer

Question

Hi,

Why we cant use new keyword for creating ArrayBuffer object?

import scala.collection.mutable.ArrayBuffer

val MyArray = new ArrayBuffer(1,2,3,4)    ==>>  Showing me error

val MyArray = ArrayBuffer(1,2,3,4)    ==>>  Working Fine

Answer 1

It's because that is the syntax. This is the syntax for creating a Scala ArrayBuffer:

import scala.collection.mutable.ArrayBuffer

var fruits = ArrayBuffer[String]()

var ints = ArrayBuffer[Int]()

The key thing to know is that the keyword new is not required before the ArrayBuffer. (This is because ArrayBuffer is either defined as a case class, or because it has an apply method defined. I haven’t looked at its source code to know which approach is taken.)

While I’m in the neighborhood, here are some other ways you can work with ArrayBuffer:

val x = ArrayBuffer('a', 'b', 'c', 'd', 'e')

var characters = ArrayBuffer[String]()

characters += "Ben"

characters += "Jerry"

characters += "Dale"