--- old/src/java.base/share/classes/java/time/chrono/ChronoPeriodImpl.java	2016-10-07 20:49:40.000000000 +0000
+++ new/src/java.base/share/classes/java/time/chrono/ChronoPeriodImpl.java	2016-10-07 20:49:40.000000000 +0000
@@ -77,8 +77,6 @@
 import java.time.temporal.TemporalUnit;
 import java.time.temporal.UnsupportedTemporalTypeException;
 import java.time.temporal.ValueRange;
-import java.util.Arrays;
-import java.util.Collections;
 import java.util.List;
 import java.util.Objects;
 
@@ -105,8 +103,7 @@
     /**
      * The set of supported units.
      */
-    private static final List<TemporalUnit> SUPPORTED_UNITS =
-            Collections.unmodifiableList(Arrays.<TemporalUnit>asList(YEARS, MONTHS, DAYS));
+    private static final List<TemporalUnit> SUPPORTED_UNITS = List.of(YEARS, MONTHS, DAYS);
 
     /**
      * The chronology.