Sealed class usage with api calls simplest

SealedClassSample.kt

package com.bd.network

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val response = fetchData()
        when (response) {
            is NetworkResponse.Failed -> {
                val message = response.message
                val code = response.code
            }
            is NetworkResponse.Success<*> -> {
                val data = response.data as String
            }
        }
    }


    fun fetchData(): NetworkResponse {
        val isServiceResponseSuccess = true
        if (isServiceResponseSuccess) {
            return NetworkResponse.Success("Success data")
        } else {
            return NetworkResponse.Failed("sıkıntı büyük baba","MOB6060")
        }
    }
}


sealed class NetworkResponse {
    class Success<T>(val data: T) : NetworkResponse()
    class Failed(val message: String,val code: String) : NetworkResponse() // can be 401, 404 or specific error code
}