1 /* 2 * Copyright (c) 2007, 2020, 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 /* 26 * @test 27 * @key stress gc randomness 28 * 29 * @summary converted from VM Testbase gc/gctests/StringIntern. 30 * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent] 31 * 32 * @library /vmTestbase 33 * /test/lib 34 * @run driver jdk.test.lib.FileInstaller . . 35 * @run main/othervm gc.gctests.StringIntern.StringIntern 36 */ 37 38 package gc.gctests.StringIntern; 39 40 import nsk.share.test.*; 41 import nsk.share.gc.*; 42 43 /** 44 * Test that strings returned by String.intern() can be collected. 45 * 46 * Create strings consisting of random characters, call String.intern(). 47 * Check that intern() contract. 48 */ 49 public class StringIntern extends ThreadedGCTest { 50 private int maxLength = 1000; 51 private int checkCount = 100; 52 53 private class StringGenerator implements Runnable { 54 private StringBuffer sb = new StringBuffer(); 55 56 private void generateRandomBuffer() { 57 int length = LocalRandom.nextInt(maxLength); 58 for (int i = 0; i < length; ++i) 59 sb.append((char) LocalRandom.nextInt(Integer.MAX_VALUE)); 60 } 61 62 private String getString() { 63 return sb.toString(); 64 } 65 66 public void run() { 67 generateRandomBuffer(); 68 for (int i = 0; i < checkCount; ++i) { 69 String s1 = getString(); 70 String s2 = getString(); 71 if (s1.intern() != s2.intern()) { 72 log.error("Test failed on: " + s1); 73 setFailed(true); 74 } 75 } 76 } 77 } 78 79 protected Runnable createRunnable(int i) { 80 return new StringGenerator(); 81 } 82 83 public static void main(String[] args) { 84 GC.runTest(new StringIntern(), args); 85 } 86 }