jdk8-mips64-public/langtools: test/tools/javac/lambda/T8025290/ExplicitVSImplicitLambdaTest.java@963c57175e40

8025290: javac implicit versus explicit lambda compilation error
Reviewed-by: jjg, dlsmith

     1 /*

     2  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    24 /*

    25  * @test

    26  * @bug 8025290

    27  * @summary javac implicit versus explicit lambda compilation error

    28  * @compile ExplicitVSImplicitLambdaTest.java

    29  */

    31 import java.util.function.*;

    33 public class ExplicitVSImplicitLambdaTest {

    34     private void test()

    35     {

    36         /* in the explicit case "e" is inferred to String so we can use a String

    37          * only method.

    38          */

    39         MyComparator.mycomparing1((String e) -> e.concat(""));

    40         MyComparator.mycomparing2((String e) -> e.concat(""));

    41         MyComparator.mycomparing3((String e) -> e.concat(""));

    42         MyComparator.mycomparing4((String e) -> e.concat(""));

    44         /* in the implicit case "e" is inferred to Object so toString() is OK.

    45          */

    46         MyComparator.mycomparing1((e) -> e.toString());

    47         MyComparator.mycomparing2((e) -> e.toString());

    48         MyComparator.mycomparing3((e) -> e.toString());

    49         MyComparator.mycomparing4((e) -> e.toString());

    50     }

    51 }

    53 interface MyComparator<T> {

    54     public static <T, U extends Comparable<? super U>> MyComparator<T> mycomparing1(

    55             Function<? super T, ? extends U> keyExtractor) {

    56         return null;

    57     }

    59     public static <T, U extends Comparable<? super U>> MyComparator<T> mycomparing2(

    60             Function<? super T, ? super U> keyExtractor) {

    61         return null;

    62     }

    64     public static <T, U extends Comparable<? super U>> MyComparator<T> mycomparing3(

    65             Function<? extends T, ? extends U> keyExtractor) {

    66         return null;

    67     }

    69     public static <T, U extends Comparable<? super U>> MyComparator<T> mycomparing4(

    70             Function<? extends T, ? super U> keyExtractor) {

    71         return null;

    72     }

    73 }

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