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diff --git a/libjava/java/io/Replaceable.java b/libjava/java/io/Replaceable.java
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+/* Replaceable.java -- Replace an object with another object
+   Copyright (C) 1998 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+ 
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+As a special exception, if you link this library with other files to
+produce an executable, this library does not by itself cause the
+resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why the
+executable file might be covered by the GNU General Public License. */
+
+
+package java.io;
+
+/**
+  * This interface is used to indicate that an object may want to have
+  * another object serialized instead of itself.  It contains one method
+  * that is to be called when an object is to be serialized.  That method
+  * is reponsible for returning the real object that should be serialized
+  * instead of object being queried.
+  *
+  * @version 0.0
+  *
+  * @author Aaron M. Renn (arenn@urbanophile.com)
+  */
+public interface Replaceable extends Serializable
+{
+
+/**
+  * This method returns the object that should be serialized instead of
+  * this object
+  *
+  * @return The real object that should be serialized
+  */
+public abstract Object
+writeReplace();
+
+} // interface Replaceable
+