src/java.base/share/classes/java/time/zone/ZoneRules.java

@@ -301,11 +301,10 @@
 
     /**
      * Creates an instance of ZoneRules that has fixed zone rules.
      *
      * @param offset  the offset this fixed zone rules is based on, not null
-     * @return the zone rules, not null
      * @see #isFixedOffset()
      */
     private ZoneRules(ZoneOffset offset) {
         this.standardOffsets = new ZoneOffset[1];
         this.standardOffsets[0] = offset;

@@ -968,11 +967,11 @@
      * daylight saving time. The list will also be empty if the transition rules are unknown.
      *
      * @return an immutable list of transition rules, not null
      */
     public List<ZoneOffsetTransitionRule> getTransitionRules() {
-        return Collections.unmodifiableList(Arrays.asList(lastRules));
+        return List.of(lastRules);
     }
 
     /**
      * Checks if this set of rules equals another.
      * <p>