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

rev 6137 : 8004015: Add Extends and deaults for basic functional interface types
Summary: Adds the appropriate extends and default methods for  core functional interfaces used by the JSR335 libraries.
Reviewed-by: duke

@@ -27,14 +27,14 @@
 /**
  * An operation on two {@code double} operands yielding a {@code double} result.
  *
  * @since 1.8
  */
-public interface DoubleBinaryOperator /* extends BinaryOperator<Double> */ {
-//
-//    @Override
-//    public default Double operate(Double left, Double right) { return operateAsDouble((double) left, (double) right); }
+public interface DoubleBinaryOperator extends BinaryOperator<Double> {
+
+    @Override
+    public default Double operate(Double left, Double right) { return operateAsDouble((double) left, (double) right); }
 
     /**
      * Returns the {@code double} result of the operation upon the
      * {@code double} operands. The parameters are named {@code left} and
      * {@code right} for operations where the order of parameters matters.