jdk8-mips64-public/langtools: test/tools/javac/generics/PermuteBound.java@4868a36f6fd8

     1 /*

     2  * Copyright (c) 2002, 2010, 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 4698375

    27  * @summary generics: subtyping problem when type parameters permuted

    28  * @author gafter

    29  *

    30  * @compile  PermuteBound.java

    31  */

    33 package PermuteBound;

    35 class C<X, Y> {}

    37 class D<X, Y> extends C<X, Y>

    38 {

    39     void f(C<X, Y> c)

    40     {

    41         D<X, Y> d = (D<X, Y>) c;// OK because D extends C

    42     }

    44     void g(C<Y, X> c)// parameters X and Y are now permuted

    45     {

    46         D<Y, X> d = (D<Y, X>) c;// should also be OK but is not !?

    47         //                    ^

    48         // inconvertible types

    49         // found :    C<Y,X>

    50         // required : D<Y,X>

    51     }

    52     /*

    53     void gWorkAround(C<Y, X> c)// but generates unchecked warning

    54     {

    55         D<Y, X> d = (D) ((C) c);

    56     }

    57     */

    58 }

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