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New Java literals

for the Brave and True
Lukáš Křečan
Prague, 20-21 October 2016
Def: To put ideas into somebody's head
To make someone want to do something they
had not thought about doing before, especially
something stupid
Cambridge Idioms Dictionary, 2nd ed.
Speaker’s Name Prague, 20-21 October 2016
Scala envy
// Array

var z = Array("Zara", "Nuha", "Ayan")
//Map

val states = Map("AL" -> "Alabama", "AK" -> "Alaska")
// XML

val hello = <p>Hello, world</p>
Speaker’s Name Prague, 20-21 October 2016
Why is is ugly?
➤ Only valid Java identifiers in names
➤ Lambdas have to be Serializable
➤ Relies on java.lang.invoke.SerializedLambda and Java
internals
➤ Misuse of lambdas
Speaker’s Name Prague, 20-21 October 2016
Sources
➤ https://github.com/benjiman/
➤ https://github.com/lukas-krecan/lambda-param-name-extractor
➤ https://www.youtube.com/watch?v=MLksirK9nnE
➤ https://github.com/lukas-krecan/json-literal
➤ java.lang.invoke.LambdaMetafactory
Speaker’s Name Prague, 20-21 October 2016

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New Java literals
 for the Brave and True

  • 1. New Java literals
 for the Brave and True Lukáš Křečan Prague, 20-21 October 2016
  • 2. Def: To put ideas into somebody's head To make someone want to do something they had not thought about doing before, especially something stupid Cambridge Idioms Dictionary, 2nd ed. Speaker’s Name Prague, 20-21 October 2016
  • 3.
  • 4. Scala envy // Array
 var z = Array("Zara", "Nuha", "Ayan") //Map
 val states = Map("AL" -> "Alabama", "AK" -> "Alaska") // XML
 val hello = <p>Hello, world</p> Speaker’s Name Prague, 20-21 October 2016
  • 5. Why is is ugly? ➤ Only valid Java identifiers in names ➤ Lambdas have to be Serializable ➤ Relies on java.lang.invoke.SerializedLambda and Java internals ➤ Misuse of lambdas Speaker’s Name Prague, 20-21 October 2016
  • 6.
  • 7.
  • 8. Sources ➤ https://github.com/benjiman/ ➤ https://github.com/lukas-krecan/lambda-param-name-extractor ➤ https://www.youtube.com/watch?v=MLksirK9nnE ➤ https://github.com/lukas-krecan/json-literal ➤ java.lang.invoke.LambdaMetafactory Speaker’s Name Prague, 20-21 October 2016