问使用应用于列表的Kotlin groupBy函数时出错ENitertools.groupby rows = [ {'address': '5412 N CLA...
println(result1) } fun split(string: String): List<Char>{ val list= mutableListOf<Char>() string.forEach {char-> list.add(char) }returnlist } Iterable<T>groupBy用法 packagecom.example.demo fun main() { val list= mutableListOf<Person>() list.add(Person(1, "Ann")) list.add(Person...
fun main(string: Array<String>) { val text = listOf("one", "two", "three") println("列表数量:${text.count()}") println("返回集合最大值Max:${text.maxOrNull()}") println("返回集合最小值Min:${text.minOrNull()}") println( "返回集合字符长度最大的:${ text.maxByOrNull { //自...
In the first example we use groupBy to group the elements of a list according to one property of the element. In the second one we divide the elements of a set depending on whether they are odd or even numbers. The condition of groupBy can be any complex function. In theory you could ...
(); groupsByLength.put(s.length(), strings); } strings.add(s); } int maximumSizeOfGroup = 0; for (List<String> group : groupsByLength.values()) { if (group.size() > maximumSizeOfGroup) { maximumSizeOfGroup = group.size(); } } for (List<String> group : groupsByLength.values...
list?.let {this.list.addAll(it) notifyDataSetChanged() } }classHomeHolder(itemView: View) : RecyclerView.ViewHolder(itemView) { } override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): HomeHolder {if(viewType == 1) {//最后一条returnHomeHolder(LoadMoreView(parent?.context)) ...
} int maximumSizeOfGroup = 0; for (List<String> group : groupsByLength.values()) { if (group.size() > maximumSizeOfGroup) { maximumSizeOfGroup = group.size(); } } for (List<String> group : groupsByLength.values()) { if (group.size() == maximumSizeOfGroup) { return group; ...
class),//value2 group.groupTable().createTime().max()//value3 )) //如果不添加orderBy则不会生成内嵌视图(t1表)sql //因为orderBy是对前面的select结果进行orderBy .orderBy(group -> group.value3().desc()) limit(2,2)//对结果进行限制返回 .toList(); -- 第1条sql数据 SELECT t1.`value...
val userInfo = mUserList.find { it.id == userId } 一行代码就表达了它的意图,(find) 这个单词就已经表达出了这里做的事情是“找出一些东西”,而大括号里面,就是找出它的条件。也就是说,Kotlin 的写法直接就帮我们表达出了(What)。按照不完全精确平均泛化类比,一个人理解一行 Java 代码的速度跟理解一行...
* * @return list of completable actions */ private val asConcurrentTasks: List<Completable> get() { if (tasks!=null) { val scheduler = createScheduler() return tasks.stream() .filter { task -> task != null } .map { task -> Completable .fromAction { task.execute() } .subscribeOn(...