enh(java) add sealed and non-sealed keywords (#3386)

CHANGES.md

@@ -4,6 +4,7 @@ Grammars:
 
 - fix(python) Fix recognition of numeric literals followed by keywords without whitespace (#2985) [Richard Gibson][]
 - enh(swift) add SE-0290 unavailability condition (#3382) [Bradley Mackey][]
+- enh(java) add `sealed` and `non-sealed` keywords (#3386) [Bradley Mackey][]
 
 [Richard Gibson]: https://github.com/gibson042
 [Bradley Mackey]: https://github.com/bradleymackey

src/languages/java.js

@@ -73,7 +73,8 @@ export default function(hljs) {
     'module',
     'requires',
     'exports',
-    'do'
+    'do',
+    'sealed'
   ];
 
   const BUILT_INS = [
@@ -179,6 +180,11 @@ export default function(hljs) {
           3: "title.class"
         }
       },
+      {
+        // Exceptions for hyphenated keywords
+        match: /non-sealed/,
+        scope: "keyword"
+      },
       {
         begin: [
           JAVA_IDENT_RE,

test/markup/java/titles.expect.txt

@@ -8,3 +8,11 @@
         }
     }
 }
+
+<span class="hljs-keyword">sealed</span> <span class="hljs-keyword">interface</span> <span class="hljs-title class_">Command</span> permits LoginCommand {
+    <span class="hljs-keyword">void</span> <span class="hljs-title function_">run</span><span class="hljs-params">()</span>;
+}
+
+<span class="hljs-keyword">non-sealed</span> <span class="hljs-keyword">abstract</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">UserPluginCommand</span> <span class="hljs-keyword">extends</span> <span class="hljs-title class_">Command</span> {
+    <span class="hljs-keyword">void</span> <span class="hljs-title function_">runAsUser</span><span class="hljs-params">()</span>;
+}

test/markup/java/titles.txt

@@ -8,3 +8,11 @@ public class Greet {
         }
     }
 }
+
+sealed interface Command permits LoginCommand {
+    void run();
+}
+
+non-sealed abstract class UserPluginCommand extends Command {
+    void runAsUser();
+}