139 lines
4.7 KiB
Java
139 lines
4.7 KiB
Java
/*
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* Copyright (c) 2003, 2015, 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 4916607
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* @summary Test casts (legal)
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* @author gafter
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*
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* @compile CastTest.java
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*/
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import java.util.*;
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class CastTest {
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// --- Directly transferring parameters ---
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private class AA<T> { }
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private class AB<T> extends AA<T> { }
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private class AC<T> extends AA<Vector<T>> { }
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private class AD<T> extends AA<Vector<? extends T>> { }
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private class AE<T> extends AA<Vector<? super T>> { }
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private class AF<T> extends AA<T[]> { }
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private class AG<T> extends AA<String> { }
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private void parameterTransfer() {
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Object o;
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o = (AB<String>) (AA<String>) null; // <<pass>>
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o = (AC<String>) (AA<Vector<String>>) null; // <<pass>>
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o = (AD<Number>) (AA<Vector<? extends Number>>) null; // <<pass>>
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o = (AD<?>) (AA<Vector<? extends Object>>) null; // <<pass>>
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o = (AD<Object>) (AA<Vector<?>>) null; // <<pass>>
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o = (AE<String>) (AA<Vector<? super String>>) null; // <<pass>>
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o = (AF<String>) (AA<String[]>) null; // <<pass>>
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o = (AG<?>) (AA<String>) null; // <<pass>>
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}
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// --- Inconsistent matches ---
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private class BA<T> { }
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private class BB<T, S> { }
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private class BC<T> extends BA<Integer> { }
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private class BD<T> extends BB<T, T> { }
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private void inconsistentMatches() {
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Object o;
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o = (BC<?>) (BA<Integer>) null; // <<pass>>
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o = (BD<String>) (BB<String, String>) null; // <<pass>>
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}
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private void whyMustEverythingBeSo_______Complicated() {
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// This has to work...
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BD<Number> bd = new BD<Number>();
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BB<? extends Number, ? super Integer> bb = bd;
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// 4916620: wildcards: legal cast is rejected
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// bd = (BD<Number>) bb; // <<warn>> <<todo: cast-infer>>
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}
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// --- Transferring parameters via supertypes ---
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private interface CA<T> { }
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private interface CB<T> extends CA<T> { }
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private interface CC<T> extends CA<T> { }
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private class CD<T> implements CB<T> { }
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private interface CE<T> extends CC<T> { }
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private interface CF<S> { }
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private interface CG<T> { }
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private class CH<S, T> implements CF<S>, CG<T> { }
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private interface CI<S> extends CF<S> { }
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private interface CJ<T> extends CG<T> { }
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private interface CK<S, T> extends CI<S>, CJ<T> { }
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private void supertypeParameterTransfer() {
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Object o;
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o = (CE<String>) (CD<String>) null; // <<pass>>
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// 4916622: unnecessary warning with cast
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// o = (CH<String, Integer>) (CK<String, Integer>) null; // <<pass>> <<todo: cast-infer>>
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}
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// --- Disjoint ---
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private interface DA<T> { }
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private interface DB<T> extends DA<T> { }
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private interface DC<T> extends DA<Integer> { }
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private <N extends Number, I extends Integer, R extends Runnable, S extends String> void disjointness() {
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Object o;
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// Classes
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o = (DA<? extends Number>) (DA<Integer>) null; // <<pass>>
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o = (DA<? super Integer>) (DA<Number>) null; // <<pass>>
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o = (DA<?>) (DA<Integer>) null; // <<pass>>
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o = (DA<?>) (DA<? extends Integer>) null; // <<pass>>
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o = (DA<?>) (DA<? super String>) null; // <<pass>>
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o = (DA<?>) (DA<?>) null; // <<pass>>
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// Typevars
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o = (DA<? extends Number>) (DA<I>) null; // <<pass>>
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// Raw (asymmetrical!)
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o = (DA) (DB<Number>) null; // <<pass>>
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o = (DA<?>) (DB) null; // <<pass>>
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o = (DA<? extends Object>) (DB) null; // <<pass>>
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o = (DB) (DA<Number>) null; // <<pass>>
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o = (DB<?>) (DA) null; // <<pass>>
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o = (DB<? extends Object>) (DA) null; // <<pass>>
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o = (DC<?>) (DA<?>) null; // <<pass>>
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}
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}
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