duke@1: /*
ohair@554:  * Copyright (c) 1997, 1998, Oracle and/or its affiliates. All rights reserved.
duke@1:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@1:  *
duke@1:  * This code is free software; you can redistribute it and/or modify it
duke@1:  * under the terms of the GNU General Public License version 2 only, as
duke@1:  * published by the Free Software Foundation.
duke@1:  *
duke@1:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@1:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@1:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@1:  * version 2 for more details (a copy is included in the LICENSE file that
duke@1:  * accompanied this code).
duke@1:  *
duke@1:  * You should have received a copy of the GNU General Public License version
duke@1:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@1:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@1:  *
ohair@554:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@554:  * or visit www.oracle.com if you need additional information or have any
ohair@554:  * questions.
duke@1:  */
duke@1: 
duke@1: /*
duke@1:  * @test
duke@1:  * @bug 4030173 4071548
duke@1:  * @summary Verify correct conversion of non-string arguments in string concatenation.
duke@1:  * @author maddox
duke@1:  *
duke@1:  * @compile StringConversion.java
duke@1:  * @run main StringConversion
duke@1:  */
duke@1: 
duke@1: class FooBar {
duke@1:     public String toString(){
duke@1:         return null;
duke@1:     }
duke@1: }
duke@1: 
duke@1: public class StringConversion {
duke@1: 
duke@1:     static void check(int testid, String have, String expect)
duke@1:                 throws Exception {
duke@1:         if ((have == null && have != expect) ||
duke@1:                 (have != null && !have.equals(expect))) {
duke@1:             String msg =
duke@1:                 "TEST " + testid + ": HAVE \"" +
duke@1:                 have + "\" EXPECT \"" + expect + "\"";
duke@1:             System.out.println("StringConversion: " + msg);
duke@1:             throw new Exception(msg);
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     public static void main(String[] args) throws Exception {
duke@1: 
duke@1:         String s;
duke@1:         String n = null;
duke@1:         Object o = null;
duke@1:         FooBar m = new FooBar();
duke@1: 
duke@1:         // Null reference must be converted to "null"
duke@1: 
duke@1:         // Conversion will be done by 'StringBuffer.append'.
duke@1:         s = "foo" + n;
duke@1:         check(11, s, "foonull");
duke@1:         s = n + "bar";
duke@1:         check(12, s, "nullbar");
duke@1:         s = "foo" + o;
duke@1:         check(13, s, "foonull");
duke@1:         s = o + "bar";
duke@1:         check(14, s, "nullbar");
duke@1: 
duke@1:         // Conversion will be done by 'String.valueOf'.
duke@1:         s = "" + n;
duke@1:         check(21, s, "null");
duke@1:         s = n + "";
duke@1:         check(22, s, "null");
duke@1:         s = "" + o;
duke@1:         check(23, s, "null");
duke@1:         s = o + "";
duke@1:         check(24, s, "null");
duke@1: 
duke@1:         // Null 'toString' result must be converted to "null"
duke@1: 
duke@1:         // Conversion will be done by 'StringBuffer.append'.
duke@1:         s = "foo" + m;
duke@1:         check(31, s, "foonull");
duke@1:         s = m + "bar";
duke@1:         check(32, s, "nullbar");
duke@1: 
duke@1:         // Conversion will be done by 'String.valueOf'.
duke@1:         s = "" + m;
duke@1:         check(43, s, "null");
duke@1:         s = m + "";
duke@1:         check(44, s, "null");
duke@1: 
duke@1:         // A character array must be converted as if by
duke@1:         // 'toString', i.e., it is treated as an 'Object'.
duke@1: 
duke@1:         s = "polymorph";
duke@1:         char[] ca = {'i', 's', 'm'};
duke@1: 
duke@1:         check(51, s + ca, s + ca.toString());
duke@1:         check(52, ca + s, ca.toString() + s);
duke@1: 
duke@1:         System.out.println("OK");
duke@1:     }
duke@1: }