ThesimplyJoin()function joins the segments in the givenStringlist separated by a space. When we pass this companion object function as a parameter,we reference it asMessageParser::simplyJoin,using the formatClassName::FunctionName. Now, let’s see if it does the job: ...
- htafoya 是的,在 Kotlin 中,dog::class返回KClass<out Dog>,这意味着我们不能真正使用它来访问dog的任何成员。我相信原因是否则就可以:(dog as Animal)::class,然后使用它来访问Animal对象的Dog成员。但是,如果我们确定要使用完全相同的dog对象来获取KClass并使用其成员,我认为将KClass<out Dog>强制转换为K...
本文简单谈下Kotlin中的函数,包括表达式函数体,命名参数,默认参数,顶层函数,扩展函数,局部函数,Lambda表达式,成员引用,with/apply函数等。从例子入手,从一般写法到使用特性进行简化,再到原理解析。 1.表达式函数体 通过下面这个简单的例子看下函数声明相关的概念,函数声明的关键字是fun,嗯,比JS的function还简单。 Kotli...
For example, this is how to declare the main function. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 fun main(args: Array<string>) { // code here } The main function must be present in each Kotlin program. It accepts an array of strings as parameter and returns nothing. If a fun...
However, if we pass a string to it, the function uses it asname: assertEquals("Hi Kai", greeting("Kai")) As we can see,Kotlin’s default arguments save us from overloading functions or writing multiple function definitions with different parameter combinations. This leads to more concise co...
descriptor: (Lkotlin/jvm/functions/Function0;)V flags: ACC_PUBLIC, ACC_STATIC, ACC_FINAL Code: stack=2, locals=1, args_size=1 0: aload_0 1: ldc #10 // String callback 3: invokestatic #16 // Method kotlin/jvm/internal/Intrinsics.checkParameterIsNotNull:(Ljava/lang/Object;Ljava/lang...
1、普通函数 VS 扩展函数 (Normal vs. extension function)如果我们对比 with 和T.run 这两个函数的话,他们实际上是十分相似的。下面使用他们实现相同的功能的例子.with(webview.settings) { javaScriptEnabled = true databaseEnabled = true } // similarly webview.settings.run { javaScriptEnabled = true ...
When you call a function with position-based arguments, the first argument corresponds to the first parameter, the second argument corresponds to the second parameter, and so on. So for passing a value for the 2nd parameter, you need to specify a value for the first parameter as well - ...
* Executes the given function [action] specified number of [times]. * * A zero-based index of current iteration is passed as a parameter to [action]. */ @kotlin.internal.InlineOnly public inline fun repeat(times: Int, action: (Int) -> Unit) { ...
java.lang.NullPointerException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkNotNullParameter, parameter bundle 为什么会出现这个问题呢? 因为基类Dialog是Java写的,而在其onCreate方法中 protected void onCreate(Bundle savedInstanceState) { } Bundle参数是可以为空值的...