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...
*/ class VariableVSValue { fun declareVar() { var a = 1 a = 2 println(a) println(a::class) println(a::class.java) var x = 5 // 自动推断出 `Int` 类型 x += 1 println("x = $x") } fun declareVal() { val b = "a" //b = "b" //编译器会报错: Val cannot be ...
fun declareVar() { var a = 1 a = 2 println(a) println(a::class) println(a::class.java) var x = 5 // 自动推断出 `Int` 类型 x += 1 println("x = $x") } fun declareVal() { val b = "a" //b = "b" //编译器会报错: Val cannot be reassigned println(b) println(b::...
Here, we declare an emptySetand aListofStringelements. We then create a newSetby concatenating the emptySetand theListusing theplus()operator. 6. Using theunion()Method Alternatively, we can obtain the same goal by using theunion()method in place of theplus()operator: ...
第1步 - 打开IntelliJ IDEA,选择Projects,再点New Project。 第2步 - 选择Java 选项,提供项目SDK路径并在Kotlin/JVM 框架打勾选中。 第3步 - 在新框架中提供项目详细信息(名称和存储目录),然后单击“完成”。 第4步 - 创建一个新的Kotlin文件来运行Kotlin的第一个例子。 打开:src -> New -> Kotlin File...
Android 3.6 introducedview binding, which generates a binding object that holds all the views in the activity. You no longer have to declare a variable for each view or widget because all the views and widgets in the activity are now properties of the binding object. ...
We can declare the keys and values to be any type; there are no restrictions.A Kotlin map can be either mutable (mutableMapOf) or read-only (mapOf).Maps are also known as dictionaries or associative arrays in other programming languages.Creating Kotlin Maps...
{ return R.color.color_black } override fun getLoadingBackground(): Int { return R.color.white } override fun getRecyclerEmptyBanding(parent: ViewGroup): ViewBinding { return LayoutEmptyBinding.inflate(LayoutInflater.from(parent.context), parent, false) } override fun getFailedBinding(...
Returning to lazy, you can use it to declare the component of the application during the declaration of the property: val component: AppComponent by lazy { DaggerAppComponent .builder() .appModule(AppModule(this)) .build() } This way you don’t need to use lateinit, and the property bec...
第一步：接口获取当前用户 token 及用户信息 第二步：将用户的昵称展示界面上 第三步：然后再通过这个...