1),Combine("b",2),Combine("c",3),Combine("a",4))val mapOfList=list.associateBy({it.alph...
A straightforward way to convert aListofMapsto aMapgrouped by keys is to use a simplefor()loop: fun groupByUsingForLoop(input: List<Map<String, String>>): Map<String, List<String>> { val result = mutableMapOf<String, MutableList<String>>() for (map in input) { for ((key, value)...
First, let’s convert DEV_MAP to one list. 3.1. Getting a List of Map.Entry In Kotlin, map.entries gives us a read-only Set of all entries in the map. Then, we can use toList() to convert the set to a list: val result = DEV_MAP.entries.toList() assertEquals(DEV_MAP.size,...
我们使用map的keySet()方法获取所有键,并从中创建一个ArrayList键列表。同样,我们使用map的values()方法获取所有值,并从中创建一个ArrayList valueList。 以下是等效的Java代码:用于将map转换为list的Java程序。 Kotlin 实例大全 Kotlin 实例大全
一切皆是映射:詳解 Kotlin Map 集合類 map's size var mp = mapOf(1 to "aone", 2 to "two", 3 to "three") println(mp.size) // 3 1. 2. get key value println(mp[2]) // two 1. for iterator for ((k, v) in mp) {
Cmdb.ListRequest.newBuilder().setProduct(cmdbProduct).build() ).productsList.map{product-> CmdbProductConverterImpl().convertToCmdbProduct(product) } 1. 2. 3. 4. 5. 上面的代码转化为一句话 CmdbProductConverterImpl().convertToCmdbProduct(product) ...
toSortedMap(Comparator { o1, o2 -> println("o1=$o1,o2=$o2") if (o1 > o2) 1 else if (o1 < o2) -1 else 0 }) println(sortedMap) // {1=aone, 2=two, 3=three, 4=four} Convert Map to List 代码语言:javascript 代码运行次数:0 运行 AI代码解释 val keyList = ArrayList(mmp....
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: ...
map["key"] = value 懒属性(延迟加载) val p: String by lazy { // 生成string的值 } 扩展函数 fun String.spcaceToCamelCase() { ... } "Convert this to camelcase".spcaceToCamelCase() 创建单例模式 object Resource { val name = "Name" ...
1println(map["key"])2map["key"] = value 1.2.11.Lazy property Lazy属性 1val p: String by lazy {23//计算串45} 1.2.12.扩展函数 1fun String.spaceToCamelCase() { ... }23"Convert this to camelcase".spaceToCamelCase() 1.2.13.创建单例模式 ...