Getting started with Scala Language Functions While Loops Pattern Matching For Expressions Collections Type Parameterization (Generics)Error Handling Extractors Case Classes Traits XML Handling Enumerations String Interpolation Currying Partial Functions Higher Order Function Type Variance Implicits Classes and Objects Operator Overloading Option Class JSON Java Interoperability Regular Expressions Setting up Scala Var, Val, and Def Futures Working With Gradle synchronized Single Abstract Method Types (SAM Types)Streams Parser Combinators Type-level Programming Annotations Macros Type Classes Parallel Collections Recursion Quasiquotes Monads If Expressions Best Practices Scaladoc Self types Type Inference Tuples Testing with ScalaTest Reflection Dependency Injection Handling units (measures)Working with data in immutable style Symbol Literals Operators in Scala Packages User Defined Functions for Hive Dynamic Invocation Continuations Library Scala.js Testing with ScalaCheck Scope scalaz

Single Abstract Method Types (SAM Types)

Remarks:

Single Abstract Methods are types, introduced in Java 8, that have exactly one abstract member.

Lambda Syntax

NOTE: This is only available in Scala 2.12+ (and in recent 2.11.x versions with the -Xexperimental -Xfuture compiler flags)

A SAM type can be implemented using a lambda:

2.11.8

trait Runnable {
  def run(): Unit
}

val t: Runnable = () => println("foo")

The type can optionally have other non-abstract members:

2.11.8

trait Runnable {
  def run(): Unit
  def concrete: Int = 42
}

val t: Runnable = () => println("foo")

Contributors

Topic Id: 3664

Example Ids: 12607

This site is not affiliated with any of the contributors.