Trusted answers to developer questions
What are Singleton Objects in Scala?
Dian Us SuqlainScala if compared to Java is more Object-Oriented. There’s no concept of the static keyword in Scala instead, we have singleton objects.
Singleton Object is an object which has one and only one instance which is used in the entire program.
Code
object Name{
// code...
}
Example
object SingletonExample{
// Variable of singleton object
var obj1 = "This is a Singleton Object"
// Method of singleton object
def show(): Unit = {
println(obj1)
}
}
// Singleton object with named as Main
object Main
{
def main(args: Array[String]): Unit = {
// Calling method of singleton object
SingletonExample.show()
}
}Scala Singleton Object
In the above example, we have a Singleton Object, i.e.,
- SingletonExample
- Main
SingletonExample contains a method named show(). Now, we call this method in Main Object.
Using the statement SingletonExample.show(), we call show() method that is present in SingletonExample object and print output.
Some key points regarding Singleton Objects
-
The method inside Singleton Object is globally accessible
-
The main method should always be present in Singleton Object
-
No need to create an object to access the method of Singleton Object
RELATED TAGS
scala
classes
CONTRIBUTOR
Dian Us SuqlainCopyright ©2022 Educative, Inc. All rights reserved
RELATED COURSES
View all Courses
Keep Exploring
Related Courses
