Convert string list from JSONArray to ArrayList funJSONArray.toArrayList():ArrayList<String>{val list=arrayListOf<String>()for(iin0untilthis.length()){list.add(this.getString(i))}returnlist}val messages=JSONArra
如下就是自定义了一个 convert 操作符,功能类似集合中的 map 函数。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 // code 6inline fun<T,E>Iterable<T>.convert(action:(T)->E):Iterable<E>{val list:MutableList<E>=mutableListOf()for(iteminthis)list.add(action(item))returnlist} 3. Kotl...
var uIntArray = UIntArray(5) { 2U } var intArray = uIntArray.toIntArray() intArray[0] = 0 print(uIntArray.toList()) // [1, 1, 1, 1, 1] print(intArray.toList()) // [0, 1, 1, 1, 1] } 1. 2. 3. 4. 5. 6. 7. 8. 如上,我们通过toIntArray()创建一个新集合,新...
...gson = new Gson(); String json = gson.toJson(writer); System.out.println(json); 用法和之前一样简单,来看一下输出结果:...4)如果一个字段的值为 null,它不会在序列化后的结果中显示。...List list =new ArrayList(); list.add("好好学习"); list.add("天天向上"); String json = ...
1. Convert the string “apple” to character array In the following example, we take a string and convert this to an array of characters using String.toCharArray() method. Main.kt </> Copy fun main() { val str = "apple" val chars = str.toCharArray() ...
inline fun <T, E> Iterable<T>.convert(action: (T) -> E): Iterable<E> { val list: MutableList<E> = mutableListOf() for (item in this) list.add(action(item)) return list } 1. 2. 3. 4. 5. 6. 3. Kotlin 中反引号 ` 的用法 ...
val capitols = listOf("England" to "London", "Poland" to "Warsaw") capitols.forEach { (country, city) -> println("Capitol of $country is $city") } 请注意,Kotlin 通过提供一组接口和辅助方法(List与MutableList,Set与Set与MutableSet,Map与MutableMap等)区分可变和不可变集合: ...
(numberOfConcurrentThreads, if (tasks == null) null else Arrays.asList<ITask>(*tasks)) {} init { if (numberOfConcurrentThreads < 0) { throw RuntimeException("Amount of threads must be higher than zero.") } } /** * Converts collection of tasks (except null tasks) to collection of...
1. Create a string from given byte array In the following example, we take an array of bytes, and convert this byte array to string using String(). Main.kt </> Copy fun main() { val bytes = byteArrayOf(97, 98, 99, 65, 66, 67) ...
valarray:Array<Int>=list.toTypedArray() println(array.contentToString())// [1, 2, 3, 4, 5] } 下載代碼 要在兩種類型之間進行轉換,您可以使用map()功能。例如,以下代碼將 Integer 列表轉換為 String 數組: 1 2 3 4 5 6 7 funmain(){ ...