考虑使用 toMutableList() 函数: presenter.getContacts().toMutableList() There are toMutableList() extensions for the stdlib types that one might want to convert to a mutable list: Collection<T> , Iterable<T> , Sequence<T> , CharSequence , Array<T> 和原始数组。 原文由 hotkey 发布,翻译遵...
println(devsToSet.toSet()) // [张三, 李四, 王五, 赵六, 孙七] //保持原始顺序 val devsToMutableSet = arrayOf("张三", "李四", "王五", "赵六", "赵六", "孙七") println(devsToMutableSet.toMutableSet()) // [张三, 李四, 王五, 赵六, 孙七] //不保持原始顺序,无序返回 val devsT...
val immutableList: List<String> = mutableList.toList() But we’ll get an error if we try to modify it: // Throws an error immutableList[0] = "World" We can even make a mutable copy of our immutable list and then modify the copy: val backToMutableList = immutableList.toMutableList(...
The toList method returns an immutable ArrayList object. In case we need a mutable ArrayList, we can call the toMutableList method: inputSet.toMutableList(). 5. Conclusion In this article, we’ve learned how to convert between Set and List in Kotlin. As always, the code for these examples...
But if you want to create a list that could be mutable, Kotlin provides MutableList<T> class to define a mutable list. In this tutorial, we shall learn with examples on how to access and modify items in a list, and how to convert it to other Collection types. ...
如果我们真的想确保对象不会被修改,我们必须使用不可变引用和不可变对象。幸运的是,Kotlin 的标准库包含了任何集合接口(List与MutableList,Map与MutableMap等)的不可变等价物,对于用于创建特定集合实例的辅助函数也是如此: 类型推断 正如我们在之前的例子中看到的,与 Java 不同,Kotlin 类型是在变量名之后定义的: ...
). This operator converts any value to the non-null corresponding type. For example, a variable of type String? becomes of a value of type String. If the value to be converted is null then the operator throws an exception. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 // it ...
forecast.temp.min.toInt())} private fun convertDate(date: Long): String { val df = DateFormat.getDateInstance(DateFormat.MEDIUM, Locale.getDefault()) return df.format(date * 1000) } data class ForecastList(val city: String, val country: String,val dailyForecast:List<Forecast>) ...
val devsToSet = arrayOf("张三", "李四", "王五", "赵六", "赵六", "孙七") println(devsToSet.toSet()) // [张三, 李四, 王五, 赵六, 孙七] //保持原始顺序 val devsToMutableSet = arrayOf("张三", "李四", "王五", "赵六", "赵六", "孙七") ...
@StableclassMusicPlayerState{varisPlayingbymutableStateOf(false)internalsetvarisBufferingbymutableStateOf(false)varcurrentTimebymutableStateOf(0.0)vartotalDurationbymutableStateOf(0.0)varcurrentPlayIdbymutableStateOf("")varplayModelbymutableStateOf(MusicPlayModel.ORDER.ordinal)funtoBack(){isPlaying=falseisBu...