enh(java) add when keyword (#4084)

* Update CHANGES.md

* add when as a java keyword

Author: cvdsteeg

CHANGES.md

@@ -82,6 +82,7 @@ Core Grammars:
 - enh(css) add `select`, `option`, `optgroup`, `picture` and `source` to list of known tags [Vasily Polovnyov][]
 - enh(css) add `inset`, `inset-*`, `border-start-*-radius` and `border-end-*-radius` attributes [Vasily Polovnyov][]
 - enh(css) add `text-decoration-skip-ink`, `text-decoration-thickness` and `text-underline-offset` attributes [Vasily Polovnyov][]
+- enh(java) add `when` to be recognized as a keyword in Java [Chiel van de Steeg][]
 
 New Grammars:
 
@@ -140,6 +141,7 @@ Themes:
 [Julien Bloino]: https://github.com/jbloino
 [Sierra]: https://github.com/casuallyblue
 [Vlad Dimov]: https://github.com/DevDimov
+[Chiel van de Steeg]: https://github.com/cvdsteeg
 
 
 

src/languages/java.js

@@ -75,7 +75,8 @@ export default function(hljs) {
     'sealed',
     'yield',
     'permits',
-    'goto'
+    'goto',
+    'when'
   ];
 
   const BUILT_INS = [