scalaj-collection. A library for converting between Java and Scala collections. Usage. Turn any Scala collection into the corresponding Java collection:

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It's the right time to try out Scala 3 and its new features. In this article, I am going to show a practical example of making DynamoDb Java client more type-safe and convenient using macros, type class derivations, extension methods, and a handful of implicits. 2020-06-27 The .asJava extension method will convert a Scala function to the most specific corresponding Java functional interface. If you wish to obtain a less specific functional interface, there are named methods that start with asJava and continue with the name of the Java functional interface. Best Java code snippets using scala.collection.JavaConverters (Showing top 20 results out of 702) Add the Codota plugin to your IDE and get smart completions. private void myMethod () {. … A collection of decorators that allow converting between Scala and Java collections using asScala and asJava methods.

This is a better way to convert a Scala immutable.Map to a Java Map in Java. java.util.Map javaMap = scala.collection.JavaConverters .mapAsJavaMapConverter(scalaMap).asJava();

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* Handles scala-java conversions. * * @param streamsToMonitor the set of system streams for which the metadata is needed. * @param metadataCache the metadata cache which will be used to fetch metadata. * @return a map from each system stream to its metadata. */ private static Map getMetadata(Set streamsToMonitor, StreamMetadataCache

For example, given these two Scala traits, one with an implemented method and one with only an interface: Using the .asJava extension method on a Scala function produces the most specific possible Java function type: scala> import scala.jdk.FunctionConverters._ scala> val f = (x: Int) => x + 1 scala> val jf1 = f.asJava jf1: java.util.function.IntUnaryOperator = Adds an asJava method that implicitly converts a Scala mutable ConcurrentMap to a Java ConcurrentMap.The returned Java ConcurrentMap is backed by the provided Scala ConcurrentMapand any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa. Steppers exist to enable creating Java streams over Scala collections, see scala.jdk.StreamConverters. sealed trait StepperShape[-T, S <: Stepper [_]] An implicit StepperShape instance is used in the IterableOnce.stepper to return a possibly specialized Stepper S according to the element type T. trait StepperShapeLowPriority1 Converting Scala Collections to Java Collections and vice versa. When you need to pass a collection into a Java method: import scala.collection.JavaConverters._ val scalaList = List(1, 2, 3) JavaLibrary.process(scalaList.asJava) If the Java code returns a Java collection, you can turn it into a Scala collection in a similar manner: Java - Scala tags/keywords. asjava, asjava, asjavacollection, asjavadictionary, asjavaenumeration, asscala, asscala, b, b, c, iterable, iterator, use, use Since scala 2.8.1 use JavaConverters._ to convert scala and Java collections using asScala and asJava methods. The Scala JavaConverters object lets you perform conversions in a manner similar to the examples shown, though they don’t offer implicit conversions. Instead they require you to explicitly call asJava or asScala methods to perform the conversions.

The “Route” is the central concept of Akka HTTP’s Routing DSL. All the structures you build with the DSL, no matter whether they consists of a single line or span several hundred lines, are type function turning a RequestContext RequestContext into a Future[RouteResult] CompletionStage. A collection of decorators that allow converting between Scala and Java collections using asScala and asJava methods. The following conversions are  Scala Standard Library 2.12.1 - scala.collection.convert.ImplicitConversions. implicit def collection asJava[A](it: Iterable[A]): Collection[A]. Implicitly converts a  asJava()) { List partitionsMetadata = JavaConverters.
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See the complete list on the right.

// Conversion decorator classes /** Generic class containing the `asJava` converter method */ class AsJava [C] (op: => C) { /** Converts a Scala collection to the corresponding Java collection */ def asJava: C = op } /** Generic class containing the `asScala` converter method */ class AsScala [C] (op: => Adds an asJava method that implicitly converts a Scala Iterator to a Java Iterator. The returned Java Iterator is backed by the provided Scala Iterator and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
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JavaConverters, implicit def mapAsJavaMapConverter[A, B](m: Map[A, B]): AsJava[Map[A, B]]. Adds an asJava method that implicitly converts a Scala Map to a 

For instance, you might want to access an existing Java collection as if it were a Scala collection. Scala Standard Library 2.13.0 - scala.collection.JavaConverters.AsJava. This is the documentation for the Scala standard library.

Conversions Between Java and Scala Collections. Language. English. 中文 (简体) Like Scala, Java also has a rich collections library. There are many similarities between the two. For instance, both libraries know iterators, iterables, sets, maps, and sequences. But there are also important differences.

Indeed, asJava looks awkward and completely unnecessary here. You can approach this problem in a few different ways. pass RDD[Row] instead of Seq[Row] to avoid asJava: sqlContext.createDataFrame(sc.parallelize(Seq(Row(1), Row(2), Row(3))), schema use product types instead of Row to avoid both asJava and passing schema: /**Cleanup evolutions for the given database.

Set < => java.util. Set scala.collection.mutable. Map < => java.util. Map scala.collection.concurrent.