1 /* 2 * Copyright (c) 2007, 2018, 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/StringInternGC. 30 * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent, quick] 31 * 32 * @library /vmTestbase 33 * /test/lib 34 * @run driver jdk.test.lib.FileInstaller . . 35 * @run main/othervm gc.gctests.StringInternGC.StringInternGC 36 */ 37 38 package gc.gctests.StringInternGC; 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 * String pool should not overflow. 48 */ 49 public class StringInternGC extends ThreadedGCTest { 50 private int maxLength = 1000; 51 52 private class StringGenerator implements Runnable { 53 private StringBuffer sb = new StringBuffer(); 54 55 private String generateString() { 56 int length = LocalRandom.nextInt(maxLength); 57 for (int i = 0; i < length; ++i) 58 sb.append((char) LocalRandom.nextInt(Integer.MAX_VALUE)); 59 return sb.toString(); 60 } 61 62 63 public void run() { 64 generateString().intern(); 65 } 66 } 67 68 protected Runnable createRunnable(int i) { 69 return new StringGenerator(); 70 } 71 72 public static void main(String[] args) { 73 GC.runTest(new StringInternGC(), args); 74 } 75 }