DefaultImpls.speak(this); } }The Kotlin compiler generates the DefaultImpls class with the speak method. This method contains the default implementation. It takes an instance of an interface as a parameter and interprets it as this (in case you call other members of this interface inside)....
在Kotlin 中,接口的定义与类的定义类似,但使用interface关键字,而不是class。接口中的成员默认是abstract的,但可以包含默认实现。 interface MyInterface { fun abstractMethod() // 抽象方法,没有实现 fun concreteMethod() { // 具体方法,有默认实现 println("This is a concrete method in the interface") } ...
In this case — the default getNumberOfWheels() implementation. It is implemented as a static method by the same name, return type, an instance parameter . $this references in the function body are refering to the instance...
@FunctionalInterface public interface Runnable { public abstract void run(); } 2.自定义接口 kotlin 版本会自动给转换成为 fun interface IRunnable { fun run(): String? } 使用方法如下: `class Internal() { funbilibli(){valrunnable = IRunnable {valmethodName =object: Any() {}.javaClass.enclos...
@Dao interface UserDao { @Insert suspend fun insertUserBySuspend(user: User) @Query("SELECT * FROM user") fun getAllBySuspendFlow(): Flow<List<User>> } 注意看getAllBySuspendFlow的返回值,是一个Flow>。然后再来看使用方式: // ViewModel /** * 插入数据到room */ fun insertUserData() { ...
(var10000,"sb.toString()");returnvar10000;}// 默认函数值publicstaticStringjoinToString$default(Collectionvar0,Stringvar1,Stringvar2,Stringvar3,intvar4,Objectvar5){if((var4&2)!=0){var1=" ";}if((var4&4)!=0){var2="[";}if((var4&8)!=0){var3="]";}returnjoinToString(var0,var1,...
{ return body; } override fun beforeBodyRead(inputMessage: HttpInputMessage?, parameter: MethodParameter?, targetType: Type?, converterType: Class<out HttpMessageConverter<*>>?): HttpInputMessage? { var body = IOUtils.toString(inputMessage?.getBody(), DEFAULT_CHARSET) as java.lang.String; va...
{returnUser.MALE;publicstaticfinal User.Companion Companion=newUser.Companion((DefaultConstructorMarker)null);}publicfinal booleanisMale(int male){returnmale==((User.Companion)this).getMALE();}privateCompanion(){}// $FF: synthetic methodpublicCompanion(DefaultConstructorMarker $constructor_marker){this...
varallByDefault:Int?// 错误: 需要一个初始化语句, 默认实现了 getter 和 setter 方法varinitialized=1// 类型为 Int, 默认实现了 getter 和 setterval simple:Int?// 类型为 Int ,默认实现 getter ,但必须在构造函数中初始化val inferredType=1// 类型为 Int 类型,默认实现 getter ...
本质上,kotlin语言经过kotlin编译器也是编译成java字节码,可以运行在JVM虚拟机上。 由于多了一道转化工序,所以一般来说,Kotlin的编译时间会更长一些,产生的编译文件也大一些。 字节码对比 可以使用Android Studio/IDEA的工具查看Kotlin的字节码: 点击菜单栏 -> Tool -> Kotlin -> Show Kotlin Bytecode,查看生成的Ja...