1/* 2 * Copyright (c) 2000, 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/* @test 25 * @summary Test proper functioning of class-defined writeReplace methods. 26 */ 27 28import java.io.*; 29 30public class WriteReplace { 31 32 static class ReplaceMe implements Serializable { 33 private Object obj; 34 private boolean writeReplaceCalled = false; 35 36 public ReplaceMe(Object obj) { 37 this.obj = obj; 38 } 39 40 private Object writeReplace() throws ObjectStreamException { 41 if (writeReplaceCalled) { 42 throw new Error("multiple calls to writeReplace"); 43 } 44 writeReplaceCalled = true; 45 return obj; 46 } 47 } 48 49 public static void main(String[] args) throws Exception { 50 final int nobjs = 10; 51 final int nrounds = 10; 52 53 Object common = "foo"; 54 ReplaceMe[] objs = new ReplaceMe[nobjs]; 55 for (int i = 0; i < nobjs; i++) { 56 objs[i] = new ReplaceMe(common); 57 } 58 59 ByteArrayOutputStream bout = new ByteArrayOutputStream(); 60 ObjectOutputStream oout = new ObjectOutputStream(bout); 61 for (int i = 0; i < nrounds; i++) { 62 for (int j = 0; j < nobjs; j++) { 63 oout.writeObject(objs[j]); 64 } 65 } 66 67 oout.flush(); 68 ByteArrayInputStream bin = 69 new ByteArrayInputStream(bout.toByteArray()); 70 ObjectInputStream oin = new ObjectInputStream(bin); 71 common = null; 72 73 for (int i = 0; i < nrounds; i++) { 74 for (int j = 0; j < nobjs; j++) { 75 if (common == null) { 76 common = oin.readObject(); 77 } else { 78 if (oin.readObject() != common) { 79 throw new Error("incorrect replacement object"); 80 } 81 } 82 } 83 } 84 } 85} 86