src/share/classes/java/util/function/DoubleFunction.java
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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
*** 26,40 ****
/**
* Apply a function to the input object yielding an appropriate {@code double}
* value; this is the {@code double}-bearing specialization for {@link Function}.
*
* @param <T> the type of input objects to the function
*
* @since 1.8
*/
! public interface DoubleFunction<T> {
/**
* Apply a function to the input object yielding an appropriate
* {@code double} value.
*
--- 26,55 ----
/**
* Apply a function to the input object yielding an appropriate {@code double}
* value; this is the {@code double}-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 DoubleFunction<T> extends Function<T,Double> {
!
! /**
! * {@inheritDoc}
! *
! * @param t {@inheritDoc}, must be non-null
! * @return {@inheritDoc}, always non-null
! */
! @Override
! public default Double apply(T t) {
! return applyAsDouble(t);
! }
/**
* Apply a function to the input object yielding an appropriate
* {@code double} value.
*