To understand a data object class, we need to understand what a data class is. In Kotlin, theobjectanddata objectare both related to singleton objects, but they serve different purposes and have distinct features. Here's a comparison: object Singleton: Theobjectkeyword in Kotlin is used to c...
父类静态代码块(companion object)→ 子类静态代码块(companion object)→ 父类属性初始化 → 父类 init 代码块 → 父类构造函数 → 子类属性初始化 → 子类 init 代码块 → 子类构造函数。 3 主构造函数 主构造函数是紧接在类名后面的构造函数,次要构造函数是类体内部定义的构造函数,它们的区别如下。 主构造...
data Class 则是在 class 内部集成了属性的 get、toString 以及 hashCode 函数 public abstract class GameAction {private GameAction(int times) { }public GameAction(int times, DefaultConstructorMarker $constructor_marker) {this(times);}// subclass:objectpublic static final class Start extends GameAction ...
val loadStatus: LoadStatus, val refreshStatus: RefreshStatus, val noteList: MutableList<NoteItem> ) : UiState sealed class Event : UiEvent { // 下拉刷新事件 object RefreshNoteListEvent : Event()
public class com/xxxx/java/SDK { // compiled from: SDK.java // access flags 0x1 public <init>()V L0 LINENUMBER 3 L0 ALOAD 0 INVOKESPECIAL java/lang/Object.<init> ()V RETURN L1 LOCALVARIABLE this Lcom/xxxx/java/SDK; L0 L1 0 ...
// object DefaultStringValidator : FieldValidator<String> { // override fun validate(input: String): Boolean = input.isNotEmpty() // } val validators = mutableMapOf<KClass<*>, FieldValidator<*>>() validators[String::class] = DefaultStringValidator validators[Int::class] = DefaultIntValidato...
let不能再次赋值. 如果对象类型是struct, 不能更新对象的任何字段. 如果是class, 则仍可更新对象的var字段. var可以给变量重新赋值, 也可以更新变量的var字段. var可以声明一个mutable的集合类型. Kotlin: val和java中的final等价, 不能再给变量重新赋值, 但是仍然可以更新对象的var字段. ...
Kotlin 入门到进阶(补充内容1) -- data、open、object、sealed、class、inner类 公开类:open 用于修饰公开类,表示该类可派生子类;或者用于修饰成员,表示该成员可以被重写。 在kotlin中它所有的类默认都是final的,那么就意味着不能被继承,而且在类中所有的方法也是默认是final的,那么就是kotlin的方法默认也不能被...
False negative [FINAL_SUPERTYPE] on extending final class through type alias KT-59644 K2: the companion object in an expect class requires to be explicitly defined for compileNativeMainKotlinMetadata KT-59640 K2: expect constructor requires calling this or super but didn't use to KT-59404 K2: ...
Data Export Using Sampling Analysis Managing the Default Data Processing Location Setting Multiple Data Processing Locations Attribution Usage Guide Using Activation Attribution Using Petal Ads Attribution (Outside the Chinese Mainland) Using AppGallery Paid Promotion Attribution (Outside the Chinese...