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


  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.util.function;
  26 
  27 /**
  28  * Apply a function to the input object yielding an appropriate {@code int}
  29  * value; this is the {@code int}-bearing specialization for {@link Function}.
  30  *




  31  * @param <T> the type of input objects to the function
  32  *
  33  * @since 1.8
  34  */
  35 public interface IntFunction<T> {











  36 
  37     /**
  38      * Apply a function to the input object yielding an appropriate {@code int}
  39      * value.
  40      *
  41      * @param t the input object
  42      * @return the function result value
  43      */
  44     public int applyAsInt(T t);
  45 }


  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.util.function;
  26 
  27 /**
  28  * Apply a function to the input object yielding an appropriate {@code int}
  29  * value; this is the {@code int}-bearing specialization for {@link Function}.
  30  *
  31  * <p>When used as a {@code Function} the default {@code apply} implementation
  32  * provided by this interface neither accepts null parameters nor does it return
  33  * null results.
  34  *
  35  * @param <T> the type of input objects to the function
  36  *
  37  * @since 1.8
  38  */
  39 public interface IntFunction<T> extends Function<T,Integer> {
  40 
  41     /**
  42      * {@inheritDoc}
  43      *
  44      * @param t {@inheritDoc}, must be non-null
  45      * @return {@inheritDoc}, always non-null
  46      */
  47     @Override
  48     public default Integer apply(T t) {
  49         return applyAsInt(t);
  50     }
  51 
  52     /**
  53      * Apply a function to the input object yielding an appropriate {@code int}
  54      * value.
  55      *
  56      * @param t the input object
  57      * @return the function result value
  58      */
  59     public int applyAsInt(T t);
  60 }