79 lines
2.7 KiB
Java
79 lines
2.7 KiB
Java
/*
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* Copyright (c) 2004, 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 5097856
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* @summary Computing hashCode of objects modeling generics shouldn't blow stack
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* @author Joseph D. Darcy
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*/
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import java.util.*;
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import java.lang.reflect.*;
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public class HashCodeTest {
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// Mutually recursive interface types
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interface Edge<N extends Node<? extends Edge<N>>> {
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void setEndNode(N n);
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}
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interface Node<E extends Edge<? extends Node<E>>> {
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E getOutEdge();
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}
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public static void main(String argv[]) {
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List<Class<?>> classes = new ArrayList<Class<?>>();
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Set<TypeVariable> typeVariables = new HashSet<TypeVariable>();
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classes.add(java.lang.Class.class);// Simple case
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classes.add(java.util.Map.class);
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classes.add(java.lang.Enum.class); // Contains f-bound
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classes.add(Edge.class);
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classes.add(Node.class);
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for(Class<?> clazz: classes) {
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System.out.println(clazz);
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for (TypeVariable<?> tv : clazz.getTypeParameters()) {
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int hc = tv.hashCode();
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typeVariables.add(tv);
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System.out.printf("\t%s 0x%x (%d)%n", tv.getName(), hc, hc);
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}
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}
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// Loop over classes again, making sure all type variables are
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// already present
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int count = 0;
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for(Class<?> clazz: classes) {
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for (TypeVariable<?> tv : clazz.getTypeParameters()) {
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if (!typeVariables.remove(tv))
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throw new RuntimeException("Type variable " + tv + " not found.");
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}
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}
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if (typeVariables.size() != 0 )
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throw new RuntimeException("Unexpected number of type variables.");
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}
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}
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