Quelle EqualityTest.java Sprache: JAVA

/*
* Copyright (c) 2016, 2021, 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
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*/

/*
* @test
* @bug 8071859 8169629
* @summary Check annotation equality behavior against the invocation handler
* @compile --release 8 EqualityTest.java
* @run main EqualityTest
* @compile EqualityTest.java
* @run main EqualityTest
*/

import java.lang.annotation.*;
import java.lang.reflect.*;

@TestAnnotation
public class EqualityTest {
    public static void main(String... args) throws Exception {
        TestAnnotation annotation =
            EqualityTest.class.getAnnotation(TestAnnotation.class);
        InvocationHandler handler = Proxy.getInvocationHandler(annotation);

        testEquality(annotation, handler,    false);
        testEquality(annotation, annotation, true);
        testEquality(handler,    handler,    true);
        testEquality(annotation, AnnotationHost.class.getAnnotation(TestAnnotation.class), true);
    }

    private static void testEquality(Object a, Object b, boolean expected) {
        boolean result = a.equals(b);
        if (result != b.equals(a) || result != expected)
            throw new RuntimeException("Unexpected result");
    }

    @TestAnnotation
    private static class AnnotationHost {}
}

@Retention(RetentionPolicy.RUNTIME)
@interface TestAnnotation {
    // Trigger creation of synthetic method to initialize r.
    public static final Runnable r = () -> {};
}

quality94%

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