1 /*

     2  * Copyright (c) 2015, 2019, 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  *

    23  */

    24 

    25 // A test class to be launched in AppCDS mode, has basic+

    26 // coverage of string operations

    27 

    28 import sun.hotspot.WhiteBox;

    29 

    30 public class HelloStringPlus {

    31     public static void main(String args[]) {

    32         // Let's reference the string that is in archive

    33         String testString1 = "shared_test_string_unique_14325";

    34         System.out.println("Hello String: " + testString1);

    35 

    36         WhiteBox wb = WhiteBox.getWhiteBox();

    37         if (!wb.isShared(testString1) && !wb.areSharedStringsIgnored()) {

    38             throw new RuntimeException("testString1 is not shared");

    39         }

    40 

    41         // Check other basic string operations

    42         // Interning and equality

    43         String[] testArray = new String[] {"shared_", "test_", "string_", "intern_", "12345"};

    44         String toBeInterned = "";

    45 

    46         StringBuilder sb = new StringBuilder();

    47         for (String s : testArray) {

    48             sb.append(s);

    49         }

    50         toBeInterned = sb.toString();

    51 

    52         System.out.println("About to intern a string: " + toBeInterned);

    53         toBeInterned.intern();

    54 

    55         // check equality

    56         if (testString1.equals(toBeInterned))

    57             throw new RuntimeException("Equality test 1 failed");

    58 

    59         if (!testString1.equals("shared_test_string" + '_' + "unique_14325"))

    60             throw new RuntimeException("Equality test 2 failed");

    61 

    62         // Chech the hash code functionality; no special assertions, just make sure

    63         // no crashe or exception occurs

    64         System.out.println("testString1.hashCode() = " + testString1.hashCode());

    65 

    66         // Check intern() method for "" string

    67         String empty = "";

    68         String empty_interned = empty.intern();

    69         if (!wb.isShared(empty)) {

    70            throw new RuntimeException("Empty string should be shared");

    71         }

    72         if (empty_interned != empty) {

    73             throw new RuntimeException("Different string is returned from intern() for empty string");

    74         }

    75     }

    76 }