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What are the similarities and differences between Scala’s Int and Java’s java.lang.Integer? What is the relationship between Int and RichInt in Scala?

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Similarities between Scala’s Int and Java’s java.lang.Integer:

  1. Both are classes.
  2. Both are used to represent integer numbers.
  3. Both are 32-bit signed integers.

Differences between Scala’s Int and Java’s java.lang.Integer:

  1. Scala’s Int class does not implement Comparable interface.
  2. Java’s java.lang.Integer class implements Comparable interface.
  3. Java’s Integer is something similar to Scala’s Int and RichInt. RichInt is a final class defined in scala.runtime package like “scala.runtime.RichInt”. In Scala, the Relationship between Int and RichInt is that when we use Int in a Scala program, it will automatically convert into RichInt to utilize all methods available in that Class.

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