1 /* 2 * Copyright 2002 Sun Microsystems, Inc. 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 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> 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 }