Java 8 list add if not exists

java.utilOptionalorElseThrow

Javadoc

Return the contained value, if present, otherwise throw an exception to be created by the provided supplier.

Popular methods of Optional

  • get
  • orElse
  • isPresent
  • ofNullable
  • empty
  • of
  • map
  • ifPresent
  • orElseGet
  • filter
  • flatMap
  • equals
  • flatMap,
  • equals,
  • hashCode,
  • toString,
  • isEmpty,
  • ,
  • ifPresentOrElse,
  • or,
  • stream

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