Java example source code file (ConstValInlining.java)

This example Java source code file (ConstValInlining.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

class, constvalinlining, exception, failed, string

The ConstValInlining.java Java example source code

/*
 * Copyright (c) 1999, 2002, 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 4253590 4255513 4115099
 * @summary Verify that non-static fields with a ConstValue attribute inlined only when used as a simple name.
 * @author maddox, gafter (adapted from leo's bug report)
 *
 * @run compile test_ff1.java
 * @run compile ConstValInlining.java
 * @run compile test_ff2.java
 * @run main ConstValInlining
 */

public class ConstValInlining {

    void test() throws Exception {
        Class checksClass = Class.forName("test_ff");
        test_ff obj = new test_ff();
        String reflected_fnl_str = (String)checksClass.getField("fnl_str").get(obj);

        T t = new T();

        // even when used by a qualified name, the compiler must inline
        if (t.fnl_str.equals(reflected_fnl_str))
            throw new Exception("FAILED: compiler failed to inline a qualified nonstatic constant");

        // when used by an unqualified name, they must not differ
        t.test(reflected_fnl_str);
    }

    static class T extends test_ff {
        void test(String reflected) throws Exception {
            // when used by an unqualified qualified name, they must differ
            if (fnl_str.equals(reflected))
                throw new Exception("FAILED: compiler failed to inline an unqualified nonstatic constant");
        }
    };

    public static void main(String args[]) throws Exception {
        new ConstValInlining().test();
    }
}