Programming Scala by Dean Wampler and Alex Payne
Author:Dean Wampler and Alex Payne
Language: eng
Format: epub, pdf
ISBN: 9781491949856
Publisher: O’Reilly Media, Inc.
Published: 2015-06-15T00:00:00+00:00
trait PureAbstractTrait { def abstractMember(str: String): Int } abstract class AbstractClass { def concreteMember(str: String): Int = str.length def abstractMember(str: String): Int }
Note
Traits with abstract members don’t have to be declared abstract by adding the abstract keyword before the trait keyword. However, classes that are abstract, where one or more member is undefined, must be declared abstract.
To expand on the fifth note, because observers is mutable, the following two expressions are equivalent:
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