/*

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 * 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.

 *

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 */

/*

 * @test

 * @bug 4030173 4071548

 * @summary Verify correct conversion of non-string arguments in string concatenation.

 * @author maddox

 *

 * @compile StringConversion.java

 * @run main StringConversion

 */

class FooBar {

    public String toString(){

        return null;

    }

}

public class StringConversion {

    static void check(int testid, String have, String expect)

                throws Exception {

        if ((have == null && have != expect) ||

                (have != null && !have.equals(expect))) {

            String msg =

                "TEST " + testid + ": HAVE \"" +

                have + "\" EXPECT \"" + expect + "\"";

            System.out.println("StringConversion: " + msg);

            throw new Exception(msg);

        }

    }

    public static void main(String[] args) throws Exception {

        String s;

        String n = null;

        Object o = null;

        FooBar m = new FooBar();

        // Null reference must be converted to "null"

        // Conversion will be done by 'StringBuffer.append'.

        s = "foo" + n;

        check(11, s, "foonull");

        s = n + "bar";

        check(12, s, "nullbar");

        s = "foo" + o;

        check(13, s, "foonull");

        s = o + "bar";

        check(14, s, "nullbar");

        // Conversion will be done by 'String.valueOf'.

        s = "" + n;

        check(21, s, "null");

        s = n + "";

        check(22, s, "null");

        s = "" + o;

        check(23, s, "null");

        s = o + "";

        check(24, s, "null");

        // Null 'toString' result must be converted to "null"

        // Conversion will be done by 'StringBuffer.append'.

        s = "foo" + m;

        check(31, s, "foonull");

        s = m + "bar";

        check(32, s, "nullbar");

        // Conversion will be done by 'String.valueOf'.

        s = "" + m;

        check(43, s, "null");

        s = m + "";

        check(44, s, "null");

        // A character array must be converted as if by

        // 'toString', i.e., it is treated as an 'Object'.

        s = "polymorph";

        char[] ca = {'i', 's', 'm'};

        check(51, s + ca, s + ca.toString());

        check(52, ca + s, ca.toString() + s);

        System.out.println("OK");

    }

}