Scala Method Overriding

When a subclass has the same name method as defined in the parent class, it is known as method overriding. When subclass wants to provide a specific implementation for the method defined in the parent class, it overrides method from parent class.

In scala, you must use either override keyword or override annotation to override methods from parent class.

Scala Method Overriding Example 1

class Vehicle{
    def run(){
        println("vehicle is running")
    }
}

class Bike extends Vehicle{
     override def run(){
        println("Bike is running")
    }
}

object MainObject{
    def main(args:Array[String]){
        var b = new Bike()
        b.run()
    }
}

Output:

Bike is running

Real example of method overriding

Flowchart

Scala Method Overriding Example 2

This example shows how subclasses override the method of parent class.

class Bank{  
        def getRateOfInterest()={
            0
        }  
    }  
      
    class SBI extends Bank{  
        override def getRateOfInterest()={
         8
        }  
    }  
      
    class ICICI extends Bank{  
        override def getRateOfInterest()={
            7
        }  
    }  
    
    class AXIS extends Bank{  
        override def getRateOfInterest()={
            9
        }  
    }  
      
    object MainObject{  
        def main(args:Array[String]){  
            var s=new SBI();  
            var i=new ICICI();  
            var a=new AXIS();  
            println("SBI Rate of Interest: "+s.getRateOfInterest());  
            println("ICICI Rate of Interest: "+i.getRateOfInterest());  
            println("AXIS Rate of Interest: "+a.getRateOfInterest());  
        }  
    }  

Output:

SBI Rate of Interest: 8
ICICI Rate of Interest: 7
AXIS Rate of Interest: 9

Next TopicScala Field Overriding

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