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/*
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* Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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import sun.hotspot.WhiteBox;
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public class InternStringTest {
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public static String passed_output1 = "Found shared string.";
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public static String passed_output2 = "Shared strings are equal.";
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public static String passed_output3 = "Found shared string containing latin1 supplement chars.";
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public static String passed_output4 = "Found shared string containing non-western chars.";
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public static final String latin1Sup = "XXXX \u00a3 YYYY"; // \u00a3 = The pound sign
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public static final String nonWestern = "XXXX \u5678 YYYY"; // \u5678 = Unicode Han Character 'ton (metric or English)'
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public static void main(String[] args) throws Exception {
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WhiteBox wb = WhiteBox.getWhiteBox();
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// All string literals are shared.
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String shared1 = "LiveOak";
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String interned1 = shared1.intern();
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if (wb.areSharedStringsIgnored() || wb.isShared(interned1)) {
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System.out.println(passed_output1);
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} else {
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throw new RuntimeException("Failed: String is not shared.");
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}
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// Test 2: shared_string1.intern() == shared_string2.intern()
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String shared2 = "LiveOak";
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String interned2 = shared2.intern();
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if (interned1 == interned2) {
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System.out.println(passed_output2);
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} else {
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throw new RuntimeException("Not equal!");
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}
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// Test 3: interned strings with a char in latin1 supplement block [\u0080-\u00ff]
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{
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String a = "X" + latin1Sup.substring(1);
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String b = a.intern();
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if (wb.areSharedStringsIgnored() || wb.isShared(b)) {
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System.out.println(passed_output3);
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} else {
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throw new RuntimeException("Failed: expected shared string with latin1-supplement chars.");
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}
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}
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// Test 5: interned strings with non-western characters
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{
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String a = "X" + nonWestern.substring(1);
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String b = a.intern();
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if (wb.areSharedStringsIgnored() || wb.isShared(b)) {
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System.out.println(passed_output4);
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} else {
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throw new RuntimeException("Failed: expected shared string with non-western chars.");
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}
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}
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}
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}
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