src/share/classes/java/time/temporal/TemporalAdjuster.java

*** 91,100 ****
--- 91,101 ----
   * This interface places no restrictions on the mutability of implementations,
   * however immutability is strongly recommended.
   *
   * @since 1.8
   */
+ @FunctionalInterface
  public interface TemporalAdjuster {
  
      /**
       * Adjusts the specified temporal object.
       * <p>
*** 125,135 ****
       * Instead, an adjusted copy of the original must be returned.
       * This provides equivalent, safe behavior for immutable and mutable temporal objects.
       * <p>
       * The input temporal object may be in a calendar system other than ISO.
       * Implementations may choose to document compatibility with other calendar systems,
!      * or reject non-ISO temporal objects by {@link Queries#chrono() querying the chronology}.
       * <p>
       * This method may be called from multiple threads in parallel.
       * It must be thread-safe when invoked.
       *
       * @param temporal  the temporal object to adjust, not null
--- 126,136 ----
       * Instead, an adjusted copy of the original must be returned.
       * This provides equivalent, safe behavior for immutable and mutable temporal objects.
       * <p>
       * The input temporal object may be in a calendar system other than ISO.
       * Implementations may choose to document compatibility with other calendar systems,
!      * or reject non-ISO temporal objects by {@link Queries#chronology() querying the chronology}.
       * <p>
       * This method may be called from multiple threads in parallel.
       * It must be thread-safe when invoked.
       *
       * @param temporal  the temporal object to adjust, not null