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Companion Objects#

Sumit Rawal answered on May 23, 2023 Popularity 7/10 Helpfulness 2/10

answer Companion Objects#

Companion Objects#

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A singleton object which has the same name as a class is known as the companion object of that class and the class is known as the companion class. Companion objects and classes can access each other’s private members.

Let’s define a companion object of the ChecksumAccumulator class defined in the previous lesson.

import scala.collection.mutable
 
class ChecksumAccumulator {
  private var sum = 0
  def add(b: Byte) = sum += b
  def checksum() = ~(sum & 0xFF) + 1
}

//companion object of ChecksumAccumulator

object ChecksumAccumulator {
  private val cache = mutable.Map.empty[String, Int]
  def calculate(s: String): Int =
    if (cache.contains(s))
      cache(s)
    else {
      val acc = new ChecksumAccumulator
      for (c <- s)
        acc.add(c.toByte)
      val cs = acc.checksum()
      cache += (s -> cs)
      cs
    }
}

// Driver Code
val result = ChecksumAccumulator.calculate("hello")
print(result)

Popularity 7/10 Helpfulness 2/10 Language scala

Source: Grepper

Tags: scala

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Contributed on May 23 2023

Sumit Rawal

0 Answers Avg Quality 2/10

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