From: Shane Carr <shane@unicode.org>
Date: Sat, 3 Mar 2018 05:35:31 +0000 (+0000)
Subject: ICU-13620 Adding comment.
X-Git-Tag: release-62-rc~200^2~106
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=6b8d9a56ed37e43087474f297dd2b77d15f12998;p=icu

ICU-13620 Adding comment.

X-SVN-Rev: 41057
---

diff --git a/icu4j/main/classes/core/src/com/ibm/icu/util/MeasureUnit.java b/icu4j/main/classes/core/src/com/ibm/icu/util/MeasureUnit.java
index d35c8dd8c0d..95b6c3e27d0 100644
--- a/icu4j/main/classes/core/src/com/ibm/icu/util/MeasureUnit.java
+++ b/icu4j/main/classes/core/src/com/ibm/icu/util/MeasureUnit.java
@@ -150,6 +150,7 @@ public class MeasureUnit implements Serializable {
         Map<String, MeasureUnit> units = cache.get(type);
         // Train users not to modify returned set from the start giving us more
         // flexibility for implementation.
+        // Use CollectionSet instead of HashSet for better performance.
         return units == null ? Collections.<MeasureUnit>emptySet()
                 : Collections.unmodifiableSet(new CollectionSet<MeasureUnit>(units.values()));
     }