test/tools/javac/generics/PermuteBound.java

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  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 4698375
  27  * @summary generics: subtyping problem when type parameters permuted
  28  * @author gafter
  29  *
  30  * @compile -source 1.5 PermuteBound.java
  31  */
  32 
  33 package test.tools.javac.generics.PermuteBound;
  34 
  35 class C<X, Y> {}
  36 
  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     }
  43 
  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>


  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 4698375
  27  * @summary generics: subtyping problem when type parameters permuted
  28  * @author gafter
  29  *
  30  * @compile  PermuteBound.java
  31  */
  32 
  33 package test.tools.javac.generics.PermuteBound;
  34 
  35 class C<X, Y> {}
  36 
  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     }
  43 
  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>