src/java.base/share/classes/java/time/Duration.java

*** 86,97 ****
  import java.time.temporal.ChronoUnit;
  import java.time.temporal.Temporal;
  import java.time.temporal.TemporalAmount;
  import java.time.temporal.TemporalUnit;
  import java.time.temporal.UnsupportedTemporalTypeException;
- import java.util.Arrays;
- import java.util.Collections;
  import java.util.List;
  import java.util.Objects;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
--- 86,95 ----
*** 576,587 ****
       * Private class to delay initialization of this list until needed.
       * The circular dependency between Duration and ChronoUnit prevents
       * the simple initialization in Duration.
       */
      private static class DurationUnits {
!         static final List<TemporalUnit> UNITS =
!                 Collections.unmodifiableList(Arrays.<TemporalUnit>asList(SECONDS, NANOS));
      }
  
      //-----------------------------------------------------------------------
      /**
       * Checks if this duration is zero length.
--- 574,584 ----
       * Private class to delay initialization of this list until needed.
       * The circular dependency between Duration and ChronoUnit prevents
       * the simple initialization in Duration.
       */
      private static class DurationUnits {
!         static final List<TemporalUnit> UNITS = List.of(SECONDS, NANOS);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Checks if this duration is zero length.