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

rev 6189 : 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

@@ -26,15 +26,30 @@
 
 /**
  * Apply a function to the input object yielding an appropriate {@code long}
  * value; this is the {@code long}-bearing specialization for {@link Function}.
  *
+ * <p/>When used as a {@code Function} the default {@code apply} implementation
+ * provided by this interface neither accepts null parameters nor does it return
+ * null results.
+ *
  * @param <T> the type of input objects to the function
  *
  * @since 1.8
  */
-public interface LongFunction<T> {
+public interface LongFunction<T> extends Function<T, Long> {
+
+    /**
+     * {@inheritDoc}
+     *
+     * @param t {@inheritDoc}, must be non-null
+     * @return {@inheritDoc}, always non-null
+     */
+    @Override
+    public  default Long apply(T t) {
+        return applyAsLong(t);
+    }
 
     /**
      * Apply a function to the input object yielding an appropriate {@code long}
      * value.
      *