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Converting Immutable to mutable list Java


Converting Immutable to mutable list Java

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Converting Immutable to mutable list Java
Tag : java , By : SachinJadhav
Date : November 27 2020, 04:01 AM

this one helps. in all honesty, that's as best as it gets, but another variant would be:
someDTO.getImmutableList().stream().collect(toCollection(ArrayList::new));

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Converting mutable to immutable map


Tag : scala , By : mansoor
Date : March 29 2020, 07:55 AM
Does that help The immutable hierarchy doesn't contain a MultiMap, so you won't be able to use the converted structure with the same convenient syntax. But if you're happy to deal with key/valueset pairs, then:
If you just want a mutable HashMap, you can just use x.toMap in 2.8 or collection.immutable.Map(x.toList: _*) in 2.7.
x.map(kv => (kv._1,kv._2.toSet)).toMap
collection.immutable.Map(
  x.map(kv => (kv._1,collection.immutable.Set(kv._2.toList: _*))).toList: _*
)

Converting immutable to mutable collections


Tag : scala , By : ugufugu
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further What is the best way to convert collection.immutable.Set to collection.mutable.Set?
scala> var a=collection.mutable.Set[Int](1,2,3)                              
a: scala.collection.mutable.Set[Int] = Set(1, 2, 3)

scala> var b=collection.immutable.Set[Int](1,2,3)
b: scala.collection.immutable.Set[Int] = Set(1, 2, 3)

scala> collection.mutable.Set(b.toArray:_*)      
res0: scala.collection.mutable.Set[Int] = Set(1, 2, 3)

scala> collection.mutable.Set(b.toSeq:_*)  
res1: scala.collection.mutable.Set[Int] = Set(1, 2, 3)

scala> collection.mutable.Set(b.toList:_*)
res2: scala.collection.mutable.Set[Int] = Set(1, 2, 3)

Converting mutable collection to immutable


Tag : scala , By : S Hall
Date : March 29 2020, 07:55 AM
should help you out If you want to convert ListBuffer into a List, use .toList. I mention this because that particular conversion is performed in constant time. Note, though, that any further use of the ListBuffer will result in its contents being copied first.
Otherwise, you can do collection.immutable.Seq(xs: _*), assuming xs is mutable, as you are unlikely to get better performance any other way.

Converting mutable java classes to immutable scala classes


Tag : scala , By : brij
Date : March 29 2020, 07:55 AM
This might help you To make the workflow of OutputFile immutable, every call has to return a new immutable instance, not just the call that swaps outfiles:
object OutputFile {
  def apply(name: String): OutputFile = {
    new OutputFile(name, newStream(name), 0)
  }

  private def newStream(name: String): FileOutputStream = {
    val localFile = File.createTempFile(name, ".gz")
    localFile.deleteOnExit()
    new FileOutputStream(localFile)
  }
}

class OutputFile(name: String, stream: FileOutputStream, bytesWritten: Int) {

  val THRESHOLD = 1000000

  def write(line: Bytes): OutputFile = write(line, 1)

  private def write(line: Bytes, attempt: Int): OutputFile = {
    try {
      val written = writeLine(line) //this writes the line to the localfile
      if (written > THRESHOLD) {
        flush
        new OutputFile(name, OutputFile.newStream(name), 0)
      } else new OutputFile(name, stream, written)
    } catch {
      case x: IOException =>
        if (attempt > 3) throw x
        else write(line, attempt + 1)
    }
  }

  // returns bytesWritten + length of line
  private def writeLine(line: Bytes): Int = ???

  // uploads file, closes and deletes it
  private def flush: Unit = ???
}

How to create a mutable array list containing immutable objects, Java


Tag : java , By : sep
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I have objects representing columns in a table that I want to declare as final. Some of these columns represent primary keys in my table, and for those columns I want to add them to an array list that gets passed into a function.
public final class Column {

private final Integer a;
private final String  b;

public Column(Integer a, String b) {
    this.a = a;
    this.b = b;
}

public Integer getA() {
    return a;
}

public String getB() {
    return b;
}

}
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