src/share/classes/java/util/function/UnaryOperator.java

rev 7047 : 8004015: Additional static and instance utils for functional interfaces.
Reviewed-by: briangoetz

*** 34,39 ****
--- 34,48 ----
   * @see Function
   * @since 1.8
   */
  @FunctionalInterface
  public interface UnaryOperator<T> extends Function<T, T> {
+ 
+     /**
+      * Returns a unary operator that provides its input value as the result.
+      *
+      * @return a unary operator that provides its input value as the result
+      */
+     static <T> UnaryOperator<T> identity() {
+         return t -> t;
+     }
  }