The best of AltJava is Xtend

•

4 likes•4,625 views

takezoe

#渋谷java

Software

What's Xtend?
● Hosted by Eclipse Foundation
● Based on Xtext
● Similar syntax to Scala or Kotlin
● Compiled to Java source code (not class file)
● Eclipse and IntelliJ support

Tool support
● IDE Plugins
○ Eclipse
○ IntelliJ IDEA (not work with IntelliJ 2017.1.2?)
● Build tools
○ Maven
○ Gradle

Eclipse support
You can install Xtend support from the update site.

About Xtext
● Framework for development of languages
● Define language using BNF like DSL
● Generate toolkit like parser or editor from it
Language
Definition
Parser
Compiler
Linker
Type checker
Editor
Generate

Xtext Summit
● In EclipseCon 2017 France
● June 20-21 (2days!!)
● One of the hottest projects in Eclipse.org

Basic syntax
● def / var / val
● () in method invocation is optional
● return and return type are optional
● null-safe call: myRef?.doStuff
● All exceptions are treated as runtime
● if, try, switch and block are expression
(for and while are void, unfortunately)

Extension methods
class HelloWorld {
def static print(String s){
println(s)
}
def static void main(String[] args){
"Hello World".print()
}
}

Extension methods
class StringExtensions {
def print(String s){ ... }
}
class HelloWorld {
static extension StringExtensions extensions = …
def static void main(String[] args){
"Hello World".print()
}
}
Import extension methods
defined in other class

Lambda expressions
def static void main(String[] args){
val list = Arrays.asList("Kotlin", "Java", "Xtend")
Collections.sort(list) [ a, b |
a.length - b.length
]
println(list)
}
Translated to lambda

Dispatch methods
def static dispatch printType(Number x) {
"it's a number"
}
def static dispatch printType(Integer x) {
"it's an int"
}
def static void main(String[] args){
println(10.printType)
}

Switch expressions
def length(Object x) {
switch x {
String case x.length > 0 : x.length
List<?> : x.size
default : -1
}
}
Type guard and case guard are available

Template expressions
def someHTML(String content) '''
<html>
<body>
«content»
</body>
</html>
'''
Three single quote!
Embed variables as «...»

Active annotations (Macro)
@Data class User {
long userId
String userName
String email
}
Generate code triggered by annotation

Xtend...
● has simple and powerful syntax.
● has excellent Eclipse support.
● covers Web, GUI and Android.
● offers 100% Java interop.

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The best of AltJava is Xtend

1. The best of AltJava is Naoki Takezoe @takezoen BizReach, Inc #渋谷java

2. What's Xtend? ● Hosted by Eclipse Foundation ● Based on Xtext ● Similar syntax to Scala or Kotlin ● Compiled to Java source code (not class file) ● Eclipse and IntelliJ support

3. What's Xtend?

4. What's Xtend?

5. ＿人人人人人人＿＞　Java10!!　＜￣Y^Y^Y^Y^Y￣

6. What's Xtend?

7. Tool support ● IDE Plugins ○ Eclipse ○ IntelliJ IDEA (not work with IntelliJ 2017.1.2?) ● Build tools ○ Maven ○ Gradle

8. Eclipse support You can install Xtend support from the update site.

9. About Xtext ● Framework for development of languages ● Define language using BNF like DSL ● Generate toolkit like parser or editor from it Language Definition Parser Compiler Linker Type checker Editor Generate

10. Xtext Summit ● In EclipseCon 2017 France ● June 20-21 (2days!!) ● One of the hottest projects in Eclipse.org

11. Language features

12. Basic syntax ● def / var / val ● () in method invocation is optional ● return and return type are optional ● null-safe call: myRef?.doStuff ● All exceptions are treated as runtime ● if, try, switch and block are expression (for and while are void, unfortunately)

13. Extension methods class HelloWorld { def static print(String s){ println(s) } def static void main(String[] args){ "Hello World".print() } }

14. Extension methods class StringExtensions { def print(String s){ ... } } class HelloWorld { static extension StringExtensions extensions = … def static void main(String[] args){ "Hello World".print() } } Import extension methods defined in other class

15. Lambda expressions def static void main(String[] args){ val list = Arrays.asList("Kotlin", "Java", "Xtend") Collections.sort(list) [ a, b | a.length - b.length ] println(list) } Translated to lambda

16. Dispatch methods def static dispatch printType(Number x) { "it's a number" } def static dispatch printType(Integer x) { "it's an int" } def static void main(String[] args){ println(10.printType) }

17. Switch expressions def length(Object x) { switch x { String case x.length > 0 : x.length List<?> : x.size default : -1 } } Type guard and case guard are available

18. Template expressions def someHTML(String content) ''' <html> <body> «content» </body> </html> ''' Three single quote! Embed variables as «...»

19. Active annotations (Macro) @Data class User { long userId String userName String email } Generate code triggered by annotation

20. Summary

21. Xtend... ● has simple and powerful syntax. ● has excellent Eclipse support. ● covers Web, GUI and Android. ● offers 100% Java interop.

22. Try http://www.eclipse.org/xtend/

The best of AltJava is Xtend

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