1/* 2 * Copyright (c) 2003, 2015, 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 */ 23 24/* 25 * @test 26 * @bug 4916607 27 * @summary Test casts (errors) 28 * @author gafter 29 * 30 * @compile/fail/ref=CastFail.out -XDrawDiagnostics CastFail.java 31 */ 32 33import java.util.*; 34 35class CastFail { 36 37 // --- Directly transferring parameters --- 38 39 private class AA<T> { } 40 41 private class AB<T> extends AA<T> { } 42 private class AC<T> extends AA<Vector<T>> { } 43 private class AD<T> extends AA<Vector<? extends T>> { } 44 private class AE<T> extends AA<Vector<? super T>> { } 45 private class AF<T> extends AA<T[]> { } 46 private class AG<T> extends AA<String> { } 47 48 private void parameterTransfer() { 49 Object o; 50 51 o = (AB<String>) (AA<Number>) null; // <<fail 1>> 52 o = (AC<String>) (AA<Vector<Number>>) null; // <<fail 2>> 53 o = (AC<String>) (AA<Stack<String>>) null; // <<fail 3>> 54 o = (AD<String>) (AA<Vector<? extends Number>>) null; // <<fail 4>> 55 o = (AE<Number>) (AA<Vector<? super String>>) null; // <<fail 5>> 56 o = (AF<String>) (AA<Number[]>) null; // <<fail 6>> 57 o = (AG<?>) (AA<Number>) null; // <<fail 7>> 58 } 59 60 // --- Inconsistent matches --- 61 62 private class BA<T> { } 63 private class BB<T, S> { } 64 65 private class BC<T> extends BA<Integer> { } 66 private class BD<T> extends BB<T, T> { } 67 68 private void inconsistentMatches() { 69 Object o; 70 71 o = (BC<?>) (BA<String>) null; // <<fail 8>> 72 o = (BD<String>) (BB<String, Number>) null; // <<fail 9>> 73 o = (BD<String>) (BB<Number, String>) null; // <<fail 10>> 74 } 75 76 // --- Transferring parameters via supertypes --- 77 78 private interface CA<T> { } 79 private interface CB<T> extends CA<T> { } 80 private interface CC<T> extends CA<T> { } 81 82 private class CD<T> implements CB<T> { } 83 private interface CE<T> extends CC<T> { } 84 85 private interface CF<S> { } 86 private interface CG<T> { } 87 private class CH<S, T> implements CF<S>, CG<T> { } 88 private interface CI<S> extends CF<S> { } 89 private interface CJ<T> extends CG<T> { } 90 private interface CK<S, T> extends CI<S>, CJ<T> { } 91 92 private void supertypeParameterTransfer() { 93 Object o; 94 CD<?> cd = (CE<?>) null; // <<fail 11>> 95 CE<?> ce = (CD<?>) null; // <<fail 12>> 96 o = (CE<Number>) (CD<String>) null; // <<fail 13>> 97 98 // 4916622: unnecessary warning with cast 99 // o = (CH<String, Integer>) (CK<String, Integer>) null; // <<pass>> <<todo: cast-infer>> 100 } 101 102 // --- Disjoint --- 103 104 private interface DA<T> { } 105 private interface DB<T> extends DA<T> { } 106 private interface DC<T> extends DA<Integer> { } 107 108 private <N extends Number, I extends Integer, R extends Runnable, S extends String> void disjointness() { 109 Object o; 110 111 // Classes 112 o = (DA<Number>) (DA<Integer>) null; // <<fail 14>> 113 o = (DA<? extends Integer>) (DA<Number>) null; // <<fail 15>> 114 o = (DA<? super Number>) (DA<Integer>) null; // <<fail 16>> 115 o = (DA<? extends Runnable>) (DA<? extends String>) null; // <<fail 17>> 116 o = (DA<? super Number>) (DA<? extends Integer>) null; // <<fail 18>> 117 118 // Typevars 119 o = (DA<? extends String>) (DA<I>) null; // <<fail 19>> 120 o = (DA<S>) (DA<R>) null; // <<fail 20>> 121 122 // Raw (asymmetrical!) 123 o = (DC<?>) (DA<? super String>) null; // <<fail 21>> 124 } 125} 126