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The way to instantiate map<String, List<String>> in Java


The way to instantiate map<String, List<String>> in Java

By : Макс Авдеев
Date : November 29 2020, 01:01 AM
this will help I would like to instantiate Map> in Java,
code :


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Efficient conversion of Scala Map[String,Seq[String]] to java.util.Map<String,List<String>>

Efficient conversion of Scala Map[String,Seq[String]] to java.util.Map<String,List<String>>


By : jatinder singh
Date : March 29 2020, 07:55 AM
To fix this issue I am new to Scala, trying to integrate some existing Java code with Scala-specific functionality in the Play Framework. , Try this:
code :
import collection.JavaConverters._
val javaMap = scalaMap.mapValues(_.asJava).asJava
No Json deserializer found for type List[(java.util.UUID, String, String, String, Int, Int, Int, Int, java.sql.Timestamp

No Json deserializer found for type List[(java.util.UUID, String, String, String, Int, Int, Int, Int, java.sql.Timestamp


By : NealM
Date : March 29 2020, 07:55 AM
This might help you My scala skill is lacking but I've been wrestling with this. But I'm having a problem serializing and deserializing JSON. I've googled and searched StackOverflow but unfortunately I cannot piece it together. , Kay, I got it sweet.
Made some edit to my model:
code :
case class User(
  id:UUID,
  username: String,
  password: String,
  email: String,
  comment_score_down: Option[Int],
  comment_score_up: Option[Int],
  post_score_down: Option[Int],
  post_score_up: Option[Int],
  created_on: Timestamp)

object Users extends Table[User]("users"){     
  implicit object UserWrites extends Writes[User] {

    def writes(u: User) = Json.obj(
         "id" -> JsString(u.id.toString),
         "username" -> JsString(u.username),
         "password" -> JsString(u.password),
         "email" -> JsString(u.email),
         "comment_score_down" -> JsNumber(u.comment_score_down.getOrElse(0).toInt),
         "comment_score_up" -> JsNumber(u.comment_score_up.getOrElse(0).toInt),
         "post_score_down" -> JsNumber(u.post_score_down.getOrElse(0).toInt),
         "post_score_up" -> JsNumber(u.post_score_up.getOrElse(0).toInt),
         "created_on" -> JsString(u.created_on.toString)
    ) 


  }
  def getUsers = Action {

    val json = database withSession {
      val users = for (u <- Users) yield u
      Json.toJson(users.list)
    }
    Ok(json).as(JSON)
  }
  def getUsers = Action {
    Ok(Users.findAll).as(JSON)
  }
package models

import java.util.UUID
import java.sql.Timestamp


import play.api.db._
import play.api.Play.current
import play.api.libs.json._


import slick.driver.PostgresDriver.simple._
import Database.threadLocalSession

case class User(
  id:UUID,
  username: String,
  password: String,
  email: String,
  comment_score_down: Option[Int],
  comment_score_up: Option[Int],
  post_score_down: Option[Int],
  post_score_up: Option[Int],
  created_on: Timestamp)

object Users extends Table[User]("users") {

  lazy val database = Database.forDataSource(DB.getDataSource())

  def id = column[UUID]("id", O.PrimaryKey) // This is the primary key column
  def username = column[String]("username")
  def password = column[String]("password")
  def email = column[String]("email")
  def comment_score_down = column[Option[Int]]("comment_score_down")
  def comment_score_up = column[Option[Int]]("comment_score_up")
  def post_score_down = column[Option[Int]]("post_score_down")
  def post_score_up = column[Option[Int]]("post_score_up")
  def created_on = column[Timestamp]("created_on")

  implicit object UserWrites extends Writes[User] {

    def writes(u: User) = Json.obj(
         "id" -> JsString(u.id.toString),
         "username" -> JsString(u.username),
         "password" -> JsString(u.password),
         "email" -> JsString(u.email),
         "comment_score_down" -> JsNumber(u.comment_score_down.getOrElse(0).toInt),
         "comment_score_up" -> JsNumber(u.comment_score_up.getOrElse(0).toInt),
         "post_score_down" -> JsNumber(u.post_score_down.getOrElse(0).toInt),
         "post_score_up" -> JsNumber(u.post_score_up.getOrElse(0).toInt),
         "created_on" -> JsString(u.created_on.toString)
    )
  }

  def * = id ~ username ~ password ~ email ~ comment_score_down ~
    comment_score_up ~ post_score_down ~ post_score_up ~ created_on <>
    (User, User.unapply _)

  def findByPK(pk: UUID) =
    for (entity <- Users if entity.id === pk) yield entity

  def findAll = database withSession {
      val users = for (u <- Users) yield u
      Json.toJson(users.list)
    }

}
Java 8/JDK8 Stream's functions Map/Reduce To group List<String> into Map<String, List<String>>

Java 8/JDK8 Stream's functions Map/Reduce To group List<String> into Map<String, List<String>>


By : Piotr Dudek
Date : March 29 2020, 07:55 AM
hope this fix your issue The single-argument groupingBy collector does exactly what you want to do. It classifies its input, which you've already done using sortChars (or getKey in the earlier example). Each stream value that's classified under the same key gets put into a list which is the map's value. Thus we have:
code :
Map<String, List<String>> anagrams =
    words2.stream().collect(Collectors.groupingBy(w -> sortChars(w)));
{door=[odor, rood], acr=[arc, car], ghint=[night, thing], aemrst=[stream],
efirs=[fires, fries], loop=[pool, loop], aemst=[meats, mates, teams]}
Map<String, List<String>> anagrams =
    words2.stream().collect(Collectors.groupingBy(GroupingAnagrams::sortChars));
Map<String, Long> anagrams =
    words2.stream().collect(
        Collectors.groupingBy(GroupingAnagrams::sortChars, Collectors.counting()));
{door=2, acr=2, ghint=2, aemrst=1, efirs=2, loop=2, aemst=3}
public static String sortChars(String input) {
    char[] characters = input.toCharArray();
    Arrays.sort(characters);
    return new String(characters);
}
Java: turn List<String> into input for method(String, String, String)

Java: turn List<String> into input for method(String, String, String)


By : Umme Salma
Date : March 29 2020, 07:55 AM
Does that help Hope the title is explanatory. , Implement run method like this:
code :
public void run(String... commands) {
  ...
}
command.run(input1);
command.run(input1, input2);
command.run(input1, input2, input3);
command.run(userInput.toArray(new String[0]);
Cannot instantiate value of type java.util.LinkedHashMap from String value ('{'); no single-String constructor/factory m

Cannot instantiate value of type java.util.LinkedHashMap from String value ('{'); no single-String constructor/factory m


By : MagdaFigue
Date : March 29 2020, 07:55 AM
I wish this helpful for you I have the following 2 classes: , You have quotes around the payload object. Try changing this part:
code :
\"payload\":\"{\"to\":1}\"
\"payload\":{\"to\":1}
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