jdk8-mips64-public/langtools: test/tools/javac/StringConversion.java@7909abb85562

     1 /*

     2  * Copyright (c) 1997, 1998, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    24 /*

    25  * @test

    26  * @bug 4030173 4071548

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

    28  * @author maddox

    29  *

    30  * @compile StringConversion.java

    31  * @run main StringConversion

    32  */

    34 class FooBar {

    35     public String toString(){

    36         return null;

    37     }

    38 }

    40 public class StringConversion {

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

    43                 throws Exception {

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

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

    46             String msg =

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

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

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

    50             throw new Exception(msg);

    51         }

    52     }

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

    56         String s;

    57         String n = null;

    58         Object o = null;

    59         FooBar m = new FooBar();

    61         // Null reference must be converted to "null"

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

    64         s = "foo" + n;

    65         check(11, s, "foonull");

    66         s = n + "bar";

    67         check(12, s, "nullbar");

    68         s = "foo" + o;

    69         check(13, s, "foonull");

    70         s = o + "bar";

    71         check(14, s, "nullbar");

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

    74         s = "" + n;

    75         check(21, s, "null");

    76         s = n + "";

    77         check(22, s, "null");

    78         s = "" + o;

    79         check(23, s, "null");

    80         s = o + "";

    81         check(24, s, "null");

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

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

    86         s = "foo" + m;

    87         check(31, s, "foonull");

    88         s = m + "bar";

    89         check(32, s, "nullbar");

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

    92         s = "" + m;

    93         check(43, s, "null");

    94         s = m + "";

    95         check(44, s, "null");

    97         // A character array must be converted as if by

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

   100         s = "polymorph";

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

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

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

   106         System.out.println("OK");

   107     }

   108 }

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