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 }