59 lines
1.7 KiB
Java
59 lines
1.7 KiB
Java
/*
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* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 4698375
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* @summary generics: subtyping problem when type parameters permuted
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* @author gafter
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*
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* @compile PermuteBound.java
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*/
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package PermuteBound;
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class C<X, Y> {}
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class D<X, Y> extends C<X, Y>
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{
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void f(C<X, Y> c)
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{
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D<X, Y> d = (D<X, Y>) c;// OK because D extends C
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}
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void g(C<Y, X> c)// parameters X and Y are now permuted
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{
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D<Y, X> d = (D<Y, X>) c;// should also be OK but is not !?
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// ^
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// inconvertible types
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// found : C<Y,X>
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// required : D<Y,X>
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}
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/*
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void gWorkAround(C<Y, X> c)// but generates unchecked warning
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{
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D<Y, X> d = (D) ((C) c);
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}
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*/
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}
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