Sealed

On Wednesday night, the town of Ithaca, NY voted to electrify and decarbonize all of its buildings. It could be a big step forward for the movement to reduce reliance on fossil fuels and it comes from a very small town on the southern shore of New York’s Cayuga Lake. …

Kalıtım (Inheritance) OOP’nin dört temel özelliğinden biridir. Sealed keyword’ü classlarda kalıtımı, methodlarda ise override* edilmesini engeller. (Sealed kelimesinin Java dilindeki karşılığı “Final”dır.) Konuyu daha net anlamak için biraz daha detaylı açıklayalım. Sealed kelime anlamı olarak gizli, mühürlü, kapalı anlamlarına gelir. Kelime anlamından da anlaşıldığı gibi Sealed keyword’ünü kullandığımız class’ı ya da methodu mühürlemiş oluruz. Sealed classa verebileceğimiz en iyi örnek “String” classtır.

Investment in residential energy efficiency and electrification company marks the Climate Technology fund’s first lead position Recently, I had to do a minor renovation on my home: install a heat pump. I thought it would be as simple as a Google search. Little did I know, I’d end up combing…

Selamlar. Bu yazıda size Kotlin sealed sınıftan bahsedeceğim, ardından Enum ile arasındaki benzerlik ve farklılıkları göstereceğim.Kotlin sealed kelimesi ilk olarak versiyon 1.4.3’te çıktı ve 1.5 sürümü ile geliştirmeye devam edildi. İlk olarak “sealed” kelimesi ile başlayalım, sealed kelimesi sınırlandırılmış, mühürlenmiş anlamına gelir ve tıpkı anlamı gibi bize sınırlandırılmış bir hiyerarşi…

當你有時候需要使用When判斷繼承類別，相對應處理事件的時候，譬如 open class ParentClass{ } 然後透過其他繼承他 class ChildA: ParentClass{ } class ChildB: ParentClass { } 然後會在某處進行判斷是否為某個實例 var name = "default" name = when(dataClass){ is ChildA -> "子類別A" is ChildB -> "子類別B" } 這時候如果在幾個月後突然你需要多一個ChildC怎麼辦? class ChildC: ParentClass { } 可是你並不一定會察覺需要在這個getTypeName增加處理，會在經過驗證後才能發現，當系統一大的時候，這將導致許多問題，該如何避免這樣的事情? Sealed class 透過在Parent中增加sealed，就可以讓when的判斷式自己察覺是否有完整的判斷，否則在compile階段就不會讓你過，而使用條件必須子類別被需告在巢狀類別中

Do you know the organization in the picture? 🙊🙊🙊 They are a seal team in Thailand. However, in the world of Kotlin, there is another term of class which is written and read in the same way as a seal team. It is known as Sealed Class. Sealed Classes? Sealed Class is…

คุณรู้จักหน่วยงานในภาพไหม? 🙊🙊🙊 พวกเขาคือหน่วย SEAL ของไทยเรานี่เอง แต่ในโลกของ Kotlin มี class ประเภทหนึ่งที่เขียนและอ่านออกเสียงเหมือนกันซึ่งวันนี้เราจะพาทุกคนไปทำความรู้จักกับสิ่งที่เรียกว่า Sealed Class นั่นเอง Sealed Classes? Sealed Class คือ class ประเภทหนึ่งที่ extension มาจาก enum class จึงทำให้มีคุณสมบัติต่างๆคล้าย enum class แต่จะมีความสามารถเพิ่มเข้ามาคือ สามารถมีได้หลาย instance มี subclasses ได้ ซึ่งต่างจาก enum class ที่มี instance ได้เพียงตัวเดียวเท่านั้นและไม่มี subclasses