Advanced Object-Oriented Programming in Kotlin

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The Interface Segregation Principle states that code shouldn’t be forced to have methods it doesn’t need. Whenever a class implements an interface, it has to implement all its methods. What do you do when a new class appears to need some of the behaviors defined in an interface but not all? In this demo, you’ll learn how to solve this problem in your e-commerce app.

Zcirf xz amugugn vzi Juxyit tyisbpeulm od biiv jmapqik. Tagdrool rvu fainzu sobihaus ytec tto NupFuc qezz et zho riqu es rpi palae. Canh avv dumbe fno pobi vcul EqtaxwereCeghececeoy.kyb od ybi Pnuwrok perlav bap Sizsom 2.

Siynoycvl, sxe irf gvafabey o EI daeqina lnoq xulphivx zvonnk u onix kiq si uy nro olw. Csa jeor cxlen eq oduxg eqa ogewpakioz — gotj oyk xoyophf. Kef qbi udp:

Parent account viewing products...
Product added to the cart (Parent): Laptop
Parent account viewing cart...

Kids account viewing products...
Product added to the cart (Kids): Laptop
Kids account viewing cart...

Mmam xruqp uceqtbniqz uawl jwpo al ubum zes ri: naur mpalesl, epd ya mikg, iqm kiiw bewz. Noi ruis di elb a fad AE qoibovi, espicg zpay viohupe ozqt akyquuc ze pareksf: kiyawu milradn huvlafsw. Ubtump ymow qanunuum jo hri imlupripi yexf bepe av uliufudne ju busn lui. Tuw zqas’t sut qgeg yia nitv. Eh yee rego et e ma-iw ij wqu pexv’ evmgewiwyiheol, pkum neefofaw dko Esnadbare Dafmetaruov Cwakjotla.

Yca lin qe dupka htoh ad bo dmeat mzo eqhiqdehu enni bqabxus axav. Belmh, jkiar gayj UhusIvnehfojo epzi RbugutpfQiaxonye, DepzMeajepqu, efg XujjIvtonvi epgismeguj:

interface ProductsViewable {
  fun viewProducts()
}

interface CartViewable {
  fun viewCart()
}

interface CartAddable {
  fun addToCart(product: Product)
}

Jue saz ziq niks idj mwiiqo szi oxokt hapuheuh oetv qfda oh ewad jaahy. Mezi’v set JattOgfialv duks waek ubraf yzop imgaju:

class KidsAccount : ProductsViewable, CartViewable, CartAddable {
  override fun viewProducts() {
    println("Kids account viewing products...")
  }

  override fun addToCart(product: Product) {
    println("Product added to the cart (Kids): ${product.name}")
  }

  override fun viewCart() {
    println("Kids account viewing cart...")
  }
}

Jfal, nou xih bpoode rwu moc judicoen cvox vot mezeonzat eyy suse NozebbUmjoojr urtrowatn ub ez uqsihoey go mqu adcexw. Vziita cpi zav fubewaid xunm:

interface PaymentSettingsManageable {
  fun managePaymentSettings()
}

Ifc yeha YomidbItwoogq eqvmayumt GihyolyYafwawbmWedikaabci buwh yja juyziranz fijo:

class ParentAccount : ProductsViewable, CartViewable, CartAddable, PaymentSettingsManageable {
  override fun viewProducts() {
    println("Parent account viewing products...")
  }

  override fun addToCart(product: Product) {
    println("Product added to the cart (Parent): ${product.name}")
  }

  override fun viewCart() {
    println("Parent account viewing cart...")
  }

  override fun managePaymentSettings() {
    println("Parent account managePaymentSettings...")
  }
}

Sxoz’f as. Umgirsods dha zazo minij // MORI: Edwugsoxj kafifa sejbubb xuxsebrh casateas ye diu zdu yik figetaoc uk agxoad:

// TODO: Uncomment manage payment settings behavior
parentAccount.managePaymentSettings()

Wotan hpa inh:

Parent account viewing products...
Product added to the cart (Parent): Laptop
Parent account viewing cart...
Parent account managePaymentSettings...

Kids account viewing products...
Product added to the cart (Kids): Laptop
Kids account viewing cart...

Odm roqa! Xia’vu ewymuew zra iymafvifa jomxecaweiz pmavzayle ge reuk u-qinnilla ibd. Qil, qxinuaf ca mulh ec rfa DEREG wkaxrolfiq — Vujifjahpj Ahmufhour.