1 /* 2 * Copyright (c) 2013, 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 * @test SanityTest 26 * @summary Sanity check of String.intern() & GC 27 * @library /testlibrary /testlibrary/whitebox 28 * @build SanityTest 29 * @run main ClassFileInstaller sun.hotspot.WhiteBox 30 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI SanityTest 31 */ 32 33 import java.util.*; 34 import sun.hotspot.WhiteBox; 35 36 37 public class SanityTest { 38 public static Object tmp; 39 public static void main(String... args) { 40 41 WhiteBox wb = WhiteBox.getWhiteBox(); 42 StringBuilder sb = new StringBuilder(); 43 sb.append("1234x"); sb.append("x56789"); 44 String str = sb.toString(); 45 46 if (wb.isInStringTable(str)) { 47 throw new RuntimeException("String " + str + " is already interned"); 48 } 49 str.intern(); 50 if (!wb.isInStringTable(str)) { 51 throw new RuntimeException("String " + str + " is not interned"); 52 } 53 str = sb.toString(); 54 wb.fullGC(); 55 if (wb.isInStringTable(str)) { 56 throw new RuntimeException("String " + str + " is in StringTable even after GC"); 57 } 58 } 59 }