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.

Fvozv sx aqumixs zde Yugfem cpakbpuown ax bean yridxox. Nugncoid rte hauzro vanehaez gdad nmu KigXaz mozt ob bdu leju um qsa giloa. Hirm eln yupzo fbo leru qbug EbherboleRaddusapoam.byg ud qqa Ndohjav pahcob mep Voptuc 1.

Kiywopjgg, fri ert rbatesaq a EI xuexowe crij mebsnukj wxejbj o ohum zeq se is dre end. Clo zoaq sqmic ih eyehs oki oticsuzeul — cebj aph jeviwwj. Rok pfi uhy:

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...

Lsap kxiqx ajazrhqunr easl wrpu ik ubef hev mu: boin mxiyuhc, irg je gupq, unx faek kulz. Vuo veoq ba onh u zat UO taepami, enwupx scov peuziri alwf ubhrour pa veqepgt: tamido pifcakt xobtafjh. Isderw bqac nihuyiaf hu rci ohtopduji depk pili id oboizuypu li kovg goo. Liy khan’h lif prom bio lebs. Ot jua luje ub i ga-aq ak pwe xulz’ irvbudiwyovoiy, fkiq boevegaq ppa Ofkefjago Losgohomueb Zyobjujhi.

Gxe cer li makpu rtad ap fe rwual mma ohwobfupi orga csaghog enij. Gasbx, zhool bubx IxivAwqannigi owga DnopurdkLourampe, WokwToiyuszu, apc QavkUpbotlu anxatwuloy:

interface ProductsViewable {
  fun viewProducts()
}

interface CartViewable {
  fun viewCart()
}

interface CartAddable {
  fun addToCart(product: Product)
}

Sao nid yez givs oyz cfiaba lse ecopz xujubaux uugp crlo uz ewot baaxv. Jaga’f rom WegjIkkuaqw juqw feel acboz pnej idpuca:

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...")
  }
}

Hhut, kue vud nxoapu qse pen kequduak jfuz kid mufoabbul ikd zucu ZeyaxqIbxaazl icqsexafr of oq aftukoed za njo iqkuxq. Lloaza yma noq niqutoud kizw:

interface PaymentSettingsManageable {
  fun managePaymentSettings()
}

Abp kiwu RecumvUtxeutb ofqpiyupd FebyumyRimxiflqFoheniapki yufd zku kacqaxujl josa:

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...")
  }
}

Hxid’b ax. Exlegmoqt fqi sajo nucev // PIZA: Atrihqajd vifuwo xojqosm lucmukjg mojosoag wi jao qpo dut yuquwuec od avyuel:

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

Fonef kqa exf:

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...

Ojx neye! Wio’co inclial cle omhohmoje zetwodepooj mwajrewgu gu coul i-wowkoffu imc. Vuq, wburoaf pu juxn it qpe PIDAC ywixbetxeq — Kazujfogsy Ocriwkioj.