jdk8-mips64-public/langtools: test/tools/javac/generics/wildcards/neg/CastWarn14.java@2eb010b6cb22 (annotated)

test/tools/javac/generics/wildcards/neg/CastWarn14.java@2eb010b6cb22 (annotated)

test/tools/javac/generics/wildcards/neg/CastWarn14.java

Thu, 31 Aug 2017 15:17:03 +0800

author: aoqi
date: Thu, 31 Aug 2017 15:17:03 +0800
changeset 2525: 2eb010b6cb22
parent 554: 9d9f26857129
parent 0: 959103a6100f
permissions: -rw-r--r--

merge

 /*
  * Copyright (c) 2003, 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/fail  -Werror -Xlint:unchecked CastWarn14.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 = (AB<String>) (AA<Number>) null; // <<fail 1>>
         o = (AC<String>) (AA<Vector<String>>) null; // <<pass>>
         o = (AC<String>) (AA<Vector<Number>>) null; // <<fail 2>>
         o = (AC<String>) (AA<Stack<String>>) null; // <<fail 3>>
         o = (AD<Number>) (AA<Vector<? extends Number>>) null; // <<pass>>
         o = (AD<String>) (AA<Vector<? extends Number>>) null; // <<fail 4>>
         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 = (AE<Number>) (AA<Vector<? super String>>) null; // <<fail 5>>
         o = (AF<String>) (AA<String[]>) null; // <<pass>>
         o = (AF<String>) (AA<Number[]>) null; // <<fail 6>>
         o = (AG<?>) (AA<String>) null; // <<pass>>
         o = (AG<?>) (AA<Number>) null; // <<fail 7>>
     }
     // --- 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 = (BC<?>) (BA<String>) null; // <<fail 8>>
         o = (BD<String>) (BB<String, String>) null; // <<pass>>
         o = (BD<String>) (BB<String, Number>) null; // <<fail 9>>
         o = (BD<String>) (BB<Number, String>) null; // <<fail 10>>
     }
     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;
         CD<?> cd = (CE<?>) null; // <<fail 11>>
         CE<?> ce = (CD<?>) null; // <<fail 12>>
         o = (CE<String>) (CD<String>) null; // <<pass>>
         o = (CE<Number>) (CD<String>) null; // <<fail 13>>
         // 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<Number>) (DA<Integer>) null; // <<fail 14>>
         o = (DA<? extends Number>) (DA<Integer>) null; // <<pass>>
         o = (DA<? extends Integer>) (DA<Number>) null; // <<fail 15>>
         o = (DA<? super Integer>) (DA<Number>) null; // <<pass>>
         o = (DA<? super Number>) (DA<Integer>) null; // <<fail 16>>
         o = (DA<?>) (DA<Integer>) null; // <<pass>>
         o = (DA<? extends Runnable>) (DA<? extends Number>) null; // <<warn 2>>
         o = (DA<? extends Runnable>) (DA<? extends String>) null; // <<fail 17>>
         o = (DA<? super Integer>) (DA<? extends Number>) null; // <<warn 3>>
         o = (DA<? super Number>) (DA<? extends Integer>) null; // <<fail 18>>
         o = (DA<?>) (DA<? extends Integer>) null; // <<pass>>
         o = (DA<? super String>) (DA<? super Number>) null; // <<warn 4>>
         o = (DA<?>) (DA<? super String>) null; // <<pass>>
         o = (DA<?>) (DA<?>) null; // <<pass>>
         // Typevars
         o = (DA<? extends Number>) (DA<I>) null; // <<pass>>
         o = (DA<? extends Integer>) (DA<N>) null; // <<warn 5>>
         o = (DA<? extends String>) (DA<I>) null; // <<fail 19>>
         o = (DA<I>) (DA<? extends Number>) null; // <<warn 6>>
         o = (DA<N>) (DA<? extends Integer>) null; // <<warn 7>>
         o = (DA<N>) (DA<? extends Runnable>) null; // <<warn 8>>
         o = (DA<N>) (DA<I>) null; // <<warn 9>>
         o = (DA<N>) (DA<R>) null; // <<warn 10>>
         o = (DA<S>) (DA<R>) null; // <<fail 20>>
         // Raw (asymmetrical!)
         o = (DA) (DB<Number>) null; // <<pass>>
         o = (DA<Number>) (DB) null; // <<warn 11>>
         o = (DA<?>) (DB) null; // <<pass>>
         o = (DA<? extends Object>) (DB) null; // <<pass>>
         o = (DA<? extends Number>) (DB) null; // <<warn 12>>
         o = (DB) (DA<Number>) null; // <<pass>>
         o = (DB<Number>) (DA) null; // <<warn 13>>
         o = (DB<?>) (DA) null; // <<pass>>
         o = (DB<? extends Object>) (DA) null; // <<pass>>
         o = (DB<? extends Number>) (DA) null; // <<warn 14>>
         o = (DC<?>) (DA<?>) null; // <<pass>>
         o = (DC<?>) (DA<? super String>) null; // <<fail 21>>
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

test/tools/javac/generics/wildcards/neg/CastWarn14.java@2eb010b6cb22 (annotated)

test/tools/javac/generics/wildcards/neg/CastWarn14.java