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Kotlin program | Example of Resolving Overriding Conflicts in Inheritance

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YasminRadwan26
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2022-07-14
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Overriding Conflicts in Inheritance

  • It may appear, we inherit more than one implementation of the same method.
  • Need to implement all the methods which we have inherited from multiple interfaces.
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YasminRadwan26
2022-07-14
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Resolving Overriding Conflicts in Inheritance in Kotlin

package com.includehelp

// declare interface
interface One{
    // abstract function
    fun myName()

    // function with implementation
    fun sayHello(){
        println("Hello, 'From Interface One' ")
    }
}

interface Two{
    // function with implementation
    fun sayHello(){
        println("Hello, 'From Interface Two' ")
    }

    // function with implementation
    fun myName(){
        println("My Name is  Interface 'Two'")
    }
}

// class implementing interface
class Three:One{
    // override interface abstract method
    override fun myName() {
        println("My Name is Class Three")
    }
}

// class implementing more then one interfaces
class Four:One,Two{

    // need to implement all the methods 
    // which we have inherited from multiple interfaces
    override fun sayHello() {
        // Both interface have sayHello implementation in interfaces,
        // so explicitly define Interface name in super to call, 
        // specific implementation from class
        super<One>.sayHello()
        super<Two>.sayHello()
        println("Hello, From Class 'Four' ")
    }

    // need to implement all the methods 
    // which we have inherited from multiple interfaces
    override fun myName() {
        // called super type implementation of method,
        // only interface two have implementation of this method, 
        // so need to explicitly define interface name
        super.myName()

        println("My Name is Class Four")
    }

}

// Main function, Entry point of program
fun main(){
    // create class instance
    val four = Four()
    // call methods
    four.myName()

    // call methods
    four.sayHello()
}

Output:

My Name is  Interface 'Two'
My Name is Class Four
Hello, 'From Interface One' 
Hello, 'From Interface Two' 
Hello, From Class 'Four'

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