How to create singleton classes in Scala?

Question

Can anyone help me out to create a singleton classes in Scala?

Answer 1

Hey,

Scala introduces a new object keyword, which is used to represent Singleton classes. These are the class with just one instance and their method can be thought of as similar to Java's static methods. 

Here is a Singleton class in Scala:

package test

object Singleton{
  def sum(l: List[Int]): Int = l.sum
}

This sum method is available globally, and can be referred to, or imported, as the test.Singleton.sum. A singleton object in Scala can also extend classes and traits.