diff --git a/classpath/java/io/DataInput.java b/classpath/java/io/DataInput.java
new file mode 100644
index 0000000000..aa14e49770
--- /dev/null
+++ b/classpath/java/io/DataInput.java
@@ -0,0 +1,29 @@
+/* Copyright (c) 2008-2013, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
+package java.io;
+
+public interface DataInput {
+	boolean readBoolean() throws IOException;
+	byte readByte() throws IOException;
+	char readChar() throws IOException;
+	double readDouble() throws IOException;
+	float readFloat() throws IOException;
+	void readFully(byte[] b) throws IOException;
+	void readFully(byte[] b, int off, int len) throws IOException;
+	int readInt() throws IOException;
+	String readLine() throws IOException;
+	long readLong() throws IOException;
+	short readShort() throws IOException;
+	int readUnsignedByte() throws IOException;
+	int readUnsignedShort() throws IOException;
+	String readUTF() throws IOException;
+	int skipBytes(int n) throws IOException;
+}
diff --git a/classpath/java/io/DataOutput.java b/classpath/java/io/DataOutput.java
new file mode 100644
index 0000000000..1d2fa12553
--- /dev/null
+++ b/classpath/java/io/DataOutput.java
@@ -0,0 +1,28 @@
+/* Copyright (c) 2008-2013, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
+package java.io;
+
+public interface DataOutput {
+	void write(byte[] b) throws IOException;
+	void write(byte[] b, int off, int len) throws IOException;
+	void write(int b) throws IOException;
+	void writeBoolean(boolean v) throws IOException;
+	void writeByte(int v) throws IOException;
+	void writeBytes(String s) throws IOException;
+	void writeChar(int v) throws IOException;
+	void writeChars(String s) throws IOException;
+	void writeDouble(double v) throws IOException;
+	void writeFloat(float v) throws IOException;
+	void writeInt(int v) throws IOException;
+	void writeLong(long v) throws IOException;
+	void writeShort(int v) throws IOException;
+	void writeUTF(String s) throws IOException;
+}