Vecka 11. Språkskillnader Scala & Java

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Skills you will develop. Even as far back as Java 6, much of this functional programming was possible in Java with a few common libraries. Akshay Sachdeva. Its amazing to me how fast   In Scala, fields in a Row object can be extracted in a pattern match. Example: Returns the value at position i of date type as java.sql.Date. java.math. _ import scala.compat.java8.FunctionConverters._ val foo: Int => Boolean = i => i > 7 def testBig(ip: IntPredicate) = ip.test(9) println(testBig(foo.asJava)) // Prints  2020年2月1日 1 2.

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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.

Be careful, because the object also contains many deprecated methods. * Handles scala-java conversions.

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* @param schema The schema where all the play evolution tables are saved in */ public static void cleanupEvolutions(Database database, boolean autocommit, String A variety of decorators that enable converting between Scala and Java collections using extension methods, asScala and asJava. The extension methods return adapters for the corresponding API. The following conversions are supported via asScala and asJava : 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 = Announcing Dotty 0.21.0-RC1 - explicit nulls, new syntax for `match` and conditional givens, and more.

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… A collection of decorators that allow converting between Scala and Java collections using asScala and asJava methods. The following conversions are supported via asJava, asScala. scala.collection.Iterable <=> java.lang.Iterable; scala.collection.Iterator <=> java.util.Iterator; scala.collection.mutable.Buffer <=> … 2020-07-04 2015-02-13 // Scala => Java /** * 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. * AsJava [A] @deprecated ("Don't access these decorators directly.", "2.10.0") type AsScala = Decorators. AsScala [ A ] @deprecated ( "Don't access these decorators directly." , … 2019-02-16 scalaj-collection.

27 Jun 2014 Java collections are not as rich as Scala collections. So you may want to _2* value._2))). You can use “asJava” to convert from Scala to Java. public static Route asJava(scala.Function1> delegate). Java DSL: Adapt an existing ScalaDSL Route   NoSuchMethodError: scala.collection.JavaConverters.seqAsJavaListConverter( Lscala/collection/Seq;)Lscala/collection/convert/Decorators$AsJava;  Then you can call the asJava method to convert any sequence (such as a Scala buffer) into a Java list.” Page 44 [2]: Change import scala.collection.
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Turn any Scala collection into the corresponding Java collection: In this Scala & Kafa tutorial, you will learn how to write Kafka messages to Kafka topic (producer) and read messages from topic (consumer) using Scala example; producer sends messages to Kafka topics in the form of records, a record is a key-value pair along with topic name and consumer receives a messages from a topic. // TODO: I cleaned all this documentation up in JavaConversions, but the // documentation in here is basically the pre-cleaned-up version with minor // additions. Would be nice to have in one place. /** A collection of decorators that allow converting between * Scala and Java collections using `asScala` and `asJava` methods.

There are many similarities between the two. For instance, both libraries know iterators, iterables, sets, maps, and sequences.
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* * @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.

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Even as far back as Java 6, much of this functional programming was possible in Java with a few common libraries. Akshay Sachdeva. Its amazing to me how fast   In Scala, fields in a Row object can be extracted in a pattern match. Example: Returns the value at position i of date type as java.sql.Date. java.math. _ import scala.compat.java8.FunctionConverters._ val foo: Int => Boolean = i => i > 7 def testBig(ip: IntPredicate) = ip.test(9) println(testBig(foo.asJava)) // Prints  2020年2月1日 1 2.

There are many similarities between the two. For instance, both libraries know iterators, iterables, sets, maps, and sequences. Conversions Between Java and Scala Collections Like Scala, Java also has a rich collections library.