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scala.jdk

OptionConverters

object OptionConverters

This object provides extension methods that convert between Scala Option and Java Optional types.

Scala Option is extended with a toJava method that creates a corresponding Optional, and a toJavaPrimitive method that creates a specialized variant (e.g., OptionalInt) if applicable.

Java Optional is extended with a toScala method and a toJavaPrimitive method.

Finally, specialized Optional types are extended with toScala and toJavaGeneric methods.

Example usage:

import scala.jdk.OptionConverters._
val a = Option("example").toJava      // Creates java.util.Optional[String] containing "example"
val b = (None: Option[String]).toJava // Creates an empty java.util.Optional[String]
val c = a.toScala                     // Back to Option("example")
val d = b.toScala                     // Back to None typed as Option[String]
val e = Option(2.7).toJava            // java.util.Optional[Double] containing boxed 2.7
val f = Option(2.7).toJavaPrimitive   // java.util.OptionalDouble containing 2.7 (not boxed)
val g = f.toScala                     // Back to Option(2.7)
val h = f.toJavaGeneric               // Same as e
val i = e.toJavaPrimitive             // Same as f
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Type Members

  1. implicit final class RichOption[A] extends AnyVal

    Provides conversions from Scala Option to Java Optional types

  2. implicit final class RichOptional[A] extends AnyVal

    Provides conversions from Java Optional to Scala Option and specialized Optional types

  3. implicit final class RichOptionalDouble extends AnyVal

    Provides conversions from OptionalDouble to Scala Option and the generic Optional

  4. implicit final class RichOptionalInt extends AnyVal

    Provides conversions from OptionalInt to Scala Option and the generic Optional

  5. implicit final class RichOptionalLong extends AnyVal

    Provides conversions from OptionalLong to Scala Option and the generic Optional

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