Kotlin program | Example of Interface

Kotlin | Example of Interface: Here, we are implementing a Kotlin program to demonstrate the example of interface.
Submitted by IncludeHelp, on June 08, 2020

Interface

Kotlin interfaces can contain abstracts methods as well as concrete methods(methods with implementations).
Kotlin interfaces can have properties but these need to be abstract or to provide accessor implementations.
Interfaces cannot store state, which makes them different from abstract classes.
Kotlin methods and properties by default abstract, if no implementation provided.
Kotlin's class can implement one or more interfaces.

Program demonstrate the example of Interface in Kotlin

package com.includehelp

// Declare Interface
interface Organization{
    // Abstract Property
    val age:Int

    // Property with accessor implementations
    val name:String
        get() = "Trump"

    // interface method with implementations
    fun printAge(){
        println("Age : $age")
    }

    // abstract method
    fun getSalary(salary:Int)

}

// class implements interface
class Manager:Organization{
    // override interface abstract property
    override val age=32

    // Override interface abstracts method
    override fun getSalary(salary: Int) {
        println("Your Salary : $salary")
    }
}

// Main function, Entry Point of Program
fun main(){
    // Create instance of class
    val organization=Manager()

    // Call function
    organization.printAge()

    // Call function
    organization.getSalary(10000)

    // Access properties
    println("Name : ${organization.name}")
}

Output:

Age : 32
Your Salary : 10000
Name : Trump

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