--- a/src/alice/jungle/persistence/PersistentJournal.java	Mon Oct 28 17:21:56 2013 +0900
+++ b/src/alice/jungle/persistence/PersistentJournal.java	Tue Oct 29 16:52:12 2013 +0900
@@ -19,8 +19,12 @@
 	private static PersistentChangeListWriter WRITER;
 	private static PersistentChangeListReader READER;
 	private static MessagePack msgpack;
-	private static OutputStream out;
-	private static InputStream in;
+	private static OutputStream out = null;
+	private static InputStream in = null;
+	
+	public PersistentJournal() {
+		msgpack = new MessagePack();
+	}
 	
 	public PersistentJournal(File file) throws FileNotFoundException {
 		out = new FileOutputStream(file, true);
@@ -40,6 +44,16 @@
 		return WRITER;
 	}
 	
+	public void setOutputFile(File file) throws FileNotFoundException {
+		out = new FileOutputStream(file);
+		WRITER = new PersistentChangeListWriter(out);
+	}
+	
+	public void setInputFile(File file) throws FileNotFoundException {
+		in = new FileInputStream(file);
+		READER = new PersistentChangeListReader(in);
+	}
+	
 	public void close() throws IOException {
 		out.close();
 		in.close();