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Difference Between Traits and Abstract Classes in Scala
  • Last Updated : 13 Feb, 2019

In Scala, an abstract class is constructed using the abstract keyword. It contains both abstract and non-abstract methods and cannot support multiple inheritances.
Example:




// Scala program to illustrate how to 
// create an abstract class
  
// Abstract class
abstract class Abstclass
{
      
    // Abstract and non-abstract method
    def portal
    def tutorial()
    
        println("Scala tutorial")
    }
  
}
  
// GFG class extends abstract class
class GFG extends Abstclass
{
    def portal()
    {
        println("Welcome!! GeeksforGeeks")
    }
}
  
object Main 
{
      
    // Main method
    def main(args: Array[String]) 
    {
        // object of GFG class
        var obj = new GFG ();
        obj.tutorial()
        obj.portal()
    }
}


Output:

Scala tutorial
Welcome!! GeeksforGeeks

Like a class, Traits can have methods(both abstract and non-abstract), and fields as its members. Traits are just like interfaces in Java. But they are more powerful than the interface in Java because in the traits we are allowed to implement the members.
Example:




// Scala program to illustrate how to 
// create traits
  
// traits
trait mytrait
{
      
    // Abstract and non-abstract method
    def portal
    def tutorial()
    
        println("Scala tutorial")
    }
  
}
  
// GFG class extends trait
class GFG extends mytrait
{
    def portal()
    {
        println("Welcome!! GeeksforGeeks")
    }
}
  
object Main 
{
      
    // Main method
    def main(args: Array[String]) 
    {
          
        // object of GFG class
        var obj = new GFG ();
        obj.tutorial()
        obj.portal()
    }
}


Output:

Scala tutorial
Welcome!! GeeksforGeeks
Traits Abstract Class
Traits support multiple inheritance. Abstract class does not support multiple inheritance.
We are allowed to add a trait to an object instance. We are not allowed to add an abstract class to an object instance.
Traits does not contain constructor parameters. Abstract class contain constructor parameters.
Traits are completely interoperable only when they do not contain any implementation code. Abstract class are completely interoperable with Java code.
Traits are stackable. So, super calls are dynamically bound. Abstract class is not stackable. So, super calls are statically bound.



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