0N/A/*
553N/A * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
0N/A * published by the Free Software Foundation.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
553N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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0N/A */
0N/A
0N/A/*
0N/A * @test
0N/A * @bug 4916607
0N/A * @summary Test casts (legal, warning, and errors)
0N/A * @author gafter
0N/A *
288N/A * @compile -Werror CastTest.java
0N/A */
0N/A
0N/Aimport java.util.*;
0N/A
0N/Aclass CastTest {
0N/A
0N/A // --- Directly transferring parameters ---
0N/A
0N/A private class AA<T> { }
0N/A
0N/A private class AB<T> extends AA<T> { }
0N/A private class AC<T> extends AA<Vector<T>> { }
0N/A private class AD<T> extends AA<Vector<? extends T>> { }
0N/A private class AE<T> extends AA<Vector<? super T>> { }
0N/A private class AF<T> extends AA<T[]> { }
0N/A private class AG<T> extends AA<String> { }
0N/A
0N/A private void parameterTransfer() {
0N/A Object o;
0N/A
0N/A o = (AB<String>) (AA<String>) null; // <<pass>>
0N/A o = (AC<String>) (AA<Vector<String>>) null; // <<pass>>
0N/A
0N/A o = (AD<Number>) (AA<Vector<? extends Number>>) null; // <<pass>>
0N/A o = (AD<?>) (AA<Vector<? extends Object>>) null; // <<pass>>
0N/A o = (AD<Object>) (AA<Vector<?>>) null; // <<pass>>
0N/A
0N/A o = (AE<String>) (AA<Vector<? super String>>) null; // <<pass>>
0N/A
0N/A o = (AF<String>) (AA<String[]>) null; // <<pass>>
0N/A
0N/A o = (AG<?>) (AA<String>) null; // <<pass>>
0N/A }
0N/A
0N/A // --- Inconsistent matches ---
0N/A
0N/A private class BA<T> { }
0N/A private class BB<T, S> { }
0N/A
0N/A private class BC<T> extends BA<Integer> { }
0N/A private class BD<T> extends BB<T, T> { }
0N/A
0N/A private void inconsistentMatches() {
0N/A Object o;
0N/A
0N/A o = (BC<?>) (BA<Integer>) null; // <<pass>>
0N/A o = (BD<String>) (BB<String, String>) null; // <<pass>>
0N/A }
0N/A
0N/A private void whyMustEverythingBeSo_______Complicated() {
0N/A // This has to work...
0N/A BD<Number> bd = new BD<Number>();
0N/A BB<? extends Number, ? super Integer> bb = bd;
0N/A
0N/A // 4916620: wildcards: legal cast is rejected
0N/A // bd = (BD<Number>) bb; // <<warn>> <<todo: cast-infer>>
0N/A }
0N/A
0N/A // --- Transferring parameters via supertypes ---
0N/A
0N/A private interface CA<T> { }
0N/A private interface CB<T> extends CA<T> { }
0N/A private interface CC<T> extends CA<T> { }
0N/A
0N/A private class CD<T> implements CB<T> { }
0N/A private interface CE<T> extends CC<T> { }
0N/A
0N/A private interface CF<S> { }
0N/A private interface CG<T> { }
0N/A private class CH<S, T> implements CF<S>, CG<T> { }
0N/A private interface CI<S> extends CF<S> { }
0N/A private interface CJ<T> extends CG<T> { }
0N/A private interface CK<S, T> extends CI<S>, CJ<T> { }
0N/A
0N/A private void supertypeParameterTransfer() {
0N/A Object o;
0N/A o = (CE<String>) (CD<String>) null; // <<pass>>
0N/A
0N/A // 4916622: unnecessary warning with cast
0N/A // o = (CH<String, Integer>) (CK<String, Integer>) null; // <<pass>> <<todo: cast-infer>>
0N/A }
0N/A
0N/A // --- Disjoint ---
0N/A
0N/A private interface DA<T> { }
0N/A private interface DB<T> extends DA<T> { }
0N/A private interface DC<T> extends DA<Integer> { }
0N/A
0N/A private <N extends Number, I extends Integer, R extends Runnable, S extends String> void disjointness() {
0N/A Object o;
0N/A
0N/A // Classes
0N/A o = (DA<? extends Number>) (DA<Integer>) null; // <<pass>>
0N/A o = (DA<? super Integer>) (DA<Number>) null; // <<pass>>
0N/A o = (DA<?>) (DA<Integer>) null; // <<pass>>
0N/A
0N/A o = (DA<?>) (DA<? extends Integer>) null; // <<pass>>
0N/A
0N/A o = (DA<?>) (DA<? super String>) null; // <<pass>>
0N/A
0N/A o = (DA<?>) (DA<?>) null; // <<pass>>
0N/A
0N/A // Typevars
0N/A o = (DA<? extends Number>) (DA<I>) null; // <<pass>>
0N/A
0N/A // Raw (asymmetrical!)
0N/A o = (DA) (DB<Number>) null; // <<pass>>
0N/A o = (DA<?>) (DB) null; // <<pass>>
0N/A o = (DA<? extends Object>) (DB) null; // <<pass>>
0N/A
0N/A o = (DB) (DA<Number>) null; // <<pass>>
0N/A o = (DB<?>) (DA) null; // <<pass>>
0N/A o = (DB<? extends Object>) (DA) null; // <<pass>>
0N/A
0N/A // reported broken (5034609)
0N/A // o = (DC<?>) (DA<?>) null; // <<pass>>
0N/A }
0N/A
0N/A}