| /* |
| * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 4916607 |
| * @summary Test casts (legal, warning, and errors) |
| * @author gafter |
| * |
| * @compile -Werror CastTest.java |
| */ |
| |
| import java.util.*; |
| |
| class CastTest { |
| |
| // --- Directly transferring parameters --- |
| |
| private class AA<T> { } |
| |
| private class AB<T> extends AA<T> { } |
| private class AC<T> extends AA<Vector<T>> { } |
| private class AD<T> extends AA<Vector<? extends T>> { } |
| private class AE<T> extends AA<Vector<? super T>> { } |
| private class AF<T> extends AA<T[]> { } |
| private class AG<T> extends AA<String> { } |
| |
| private void parameterTransfer() { |
| Object o; |
| |
| o = (AB<String>) (AA<String>) null; // <<pass>> |
| o = (AC<String>) (AA<Vector<String>>) null; // <<pass>> |
| |
| o = (AD<Number>) (AA<Vector<? extends Number>>) null; // <<pass>> |
| o = (AD<?>) (AA<Vector<? extends Object>>) null; // <<pass>> |
| o = (AD<Object>) (AA<Vector<?>>) null; // <<pass>> |
| |
| o = (AE<String>) (AA<Vector<? super String>>) null; // <<pass>> |
| |
| o = (AF<String>) (AA<String[]>) null; // <<pass>> |
| |
| o = (AG<?>) (AA<String>) null; // <<pass>> |
| } |
| |
| // --- Inconsistent matches --- |
| |
| private class BA<T> { } |
| private class BB<T, S> { } |
| |
| private class BC<T> extends BA<Integer> { } |
| private class BD<T> extends BB<T, T> { } |
| |
| private void inconsistentMatches() { |
| Object o; |
| |
| o = (BC<?>) (BA<Integer>) null; // <<pass>> |
| o = (BD<String>) (BB<String, String>) null; // <<pass>> |
| } |
| |
| private void whyMustEverythingBeSo_______Complicated() { |
| // This has to work... |
| BD<Number> bd = new BD<Number>(); |
| BB<? extends Number, ? super Integer> bb = bd; |
| |
| // 4916620: wildcards: legal cast is rejected |
| // bd = (BD<Number>) bb; // <<warn>> <<todo: cast-infer>> |
| } |
| |
| // --- Transferring parameters via supertypes --- |
| |
| private interface CA<T> { } |
| private interface CB<T> extends CA<T> { } |
| private interface CC<T> extends CA<T> { } |
| |
| private class CD<T> implements CB<T> { } |
| private interface CE<T> extends CC<T> { } |
| |
| private interface CF<S> { } |
| private interface CG<T> { } |
| private class CH<S, T> implements CF<S>, CG<T> { } |
| private interface CI<S> extends CF<S> { } |
| private interface CJ<T> extends CG<T> { } |
| private interface CK<S, T> extends CI<S>, CJ<T> { } |
| |
| private void supertypeParameterTransfer() { |
| Object o; |
| o = (CE<String>) (CD<String>) null; // <<pass>> |
| |
| // 4916622: unnecessary warning with cast |
| // o = (CH<String, Integer>) (CK<String, Integer>) null; // <<pass>> <<todo: cast-infer>> |
| } |
| |
| // --- Disjoint --- |
| |
| private interface DA<T> { } |
| private interface DB<T> extends DA<T> { } |
| private interface DC<T> extends DA<Integer> { } |
| |
| private <N extends Number, I extends Integer, R extends Runnable, S extends String> void disjointness() { |
| Object o; |
| |
| // Classes |
| o = (DA<? extends Number>) (DA<Integer>) null; // <<pass>> |
| o = (DA<? super Integer>) (DA<Number>) null; // <<pass>> |
| o = (DA<?>) (DA<Integer>) null; // <<pass>> |
| |
| o = (DA<?>) (DA<? extends Integer>) null; // <<pass>> |
| |
| o = (DA<?>) (DA<? super String>) null; // <<pass>> |
| |
| o = (DA<?>) (DA<?>) null; // <<pass>> |
| |
| // Typevars |
| o = (DA<? extends Number>) (DA<I>) null; // <<pass>> |
| |
| // Raw (asymmetrical!) |
| o = (DA) (DB<Number>) null; // <<pass>> |
| o = (DA<?>) (DB) null; // <<pass>> |
| o = (DA<? extends Object>) (DB) null; // <<pass>> |
| |
| o = (DB) (DA<Number>) null; // <<pass>> |
| o = (DB<?>) (DA) null; // <<pass>> |
| o = (DB<? extends Object>) (DA) null; // <<pass>> |
| |
| // reported broken (5034609) |
| // o = (DC<?>) (DA<?>) null; // <<pass>> |
| } |
| |
| } |