Quelle RedefineClassTest.java Sprache: JAVA

/*
* Copyright (c) 2014, 2019, 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
* @library /test/lib
* @summary Proof of concept test for RedefineClassHelper
* @modules java.base/jdk.internal.misc
* @modules java.compiler
*          java.instrument
* @run main RedefineClassHelper
* @run main/othervm -javaagent:redefineagent.jar RedefineClassTest
*/

import static jdk.test.lib.Asserts.*;

/*
* Proof of concept test for the test utility class RedefineClassHelper
*/

// package access top-level class to avoid problem with RedefineClassHelper
// and nested types.
class RedefineClassTest_A {
    public int Method() {
        return 1;
    }
}

public class RedefineClassTest {

    public static String newClass = "class RedefineClassTest_A { public int Method() { return 2; } }";
    public static void main(String[] args) throws Exception {
        RedefineClassTest_A a = new RedefineClassTest_A();
        assertTrue(a.Method() == 1);
        RedefineClassHelper.redefineClass(RedefineClassTest_A.class, newClass);
        assertTrue(a.Method() == 2);
    }
}

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