package com.yzdzy.kotlin.chapter5 import java.lang.StringBuilder fun main(args: Array<String>) { //int range的集合 //阶乘再想加 val res = (0..6).map(::factorial).foldRight(StringBuilder()) { i, acc -> acc.append(i).append(",") } println(res) } fun factorial(n: Int): Int ...
mapLast Modifies the last element of the stream via a defined Function. Example: Flowable .just(1, 2, 3) .compose(Transformers.mapLast(x -> x + 1)) .forEach(System.out::println); produces 1 2 4 match, matchWith Finds out-of-order matches in two streams. javadoc You can use Fl...
stream.forEach { println(it) }不会关闭流。流是可自动关闭的，只是为了允许人们通过在尝试资源中使用...
Java Copy Code System.out.println("NEO count: " + neoWsData.elementCount); System.out.println("Potentially hazardous asteroids: " + neoWsData.nearEarthObjects.values() .stream().flatMap(Collection::stream) // this converts a Collection of Collections of objects into a single stream .fil...
[K in keyof O]: O[K] extends Expression<infer V> ? V : never }> > { return sql`json_object(${sql.join( Object.keys(obj).flatMap((k) => [sql.lit(k), obj[k]]), )})` } function getSqliteJsonObjectArgs( node: SelectQueryNode, table: string, ): Expression<unknown>[] { ...
java.util.stream.LongStream When to Use range() and rangeClosed() methods of IntStream, LongStream for(int i=init; i<=n; i++){//logic goes here} init n to generate a stream of a fixed sequence of numbers starting from an initial until a final value, where each n...
完整报错如下: 'call(Tuple2<Long, Row>)' in 'Anonymous class derived from org.apache.spark.api.java.function.PairFlatMapFunction' clashes with 'call(T)' in 'org.apache.spark.api.java.function.PairFlatM...error: must use ‘class’ tag to refer to type ‘XXX’ in this scope 开发环境...
Avoiding time consuming logic when using flatmapIterable I have a task to split a word into characters and then transfer each to another word. I write some test code, use toCharArray to get char array in the flatMapIterable section, but if the target string... ...
Address already in use: JVM_Bind 使用idea时突然间启动项目报Address already in use: JVM_Bind:69775,将本地java进程全部杀死后还是不行。 使用命令:netstat -anob|findstr "59775" 查看该端口进程,如果存在,将其杀死(而我的不存在) 使用命令:netstat -ano 也没有找到该端口......
.flatMap(_.split("\\s+")) .map((_, 1)) .groupBy(_._1) .map(tp => (tp._1, tp._2.size)) .sortBy(-_._2) res.saveAsTextFile("/spark/wc2/") //释放环境 sc.stop() } } 打包 上传到linux机器 bin/spark-submit --master local[*] --class com._51doit.spark.day01....