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diff --git a/java/core/src/main/java/com/google/protobuf/Writer.java b/java/core/src/main/java/com/google/protobuf/Writer.java
new file mode 100644
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+++ b/java/core/src/main/java/com/google/protobuf/Writer.java
@@ -0,0 +1,155 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf;
+
+import java.util.List;
+
+/** A writer that performs serialization of protobuf message fields. */
+@ExperimentalApi
+public interface Writer {
+  /** Writes a field of type {@link FieldType#SFIXED32}. */
+  void writeSFixed32(int fieldNumber, int value);
+
+  /** Writes a field of type {@link FieldType#INT64}. */
+  void writeInt64(int fieldNumber, long value);
+
+  /** Writes a field of type {@link FieldType#SFIXED64}. */
+  void writeSFixed64(int fieldNumber, long value);
+
+  /** Writes a field of type {@link FieldType#FLOAT}. */
+  void writeFloat(int fieldNumber, float value);
+
+  /** Writes a field of type {@link FieldType#DOUBLE}. */
+  void writeDouble(int fieldNumber, double value);
+
+  /** Writes a field of type {@link FieldType#ENUM}. */
+  void writeEnum(int fieldNumber, int value);
+
+  /** Writes a field of type {@link FieldType#UINT64}. */
+  void writeUInt64(int fieldNumber, long value);
+
+  /** Writes a field of type {@link FieldType#INT32}. */
+  void writeInt32(int fieldNumber, int value);
+
+  /** Writes a field of type {@link FieldType#FIXED64}. */
+  void writeFixed64(int fieldNumber, long value);
+
+  /** Writes a field of type {@link FieldType#FIXED32}. */
+  void writeFixed32(int fieldNumber, int value);
+
+  /** Writes a field of type {@link FieldType#BOOL}. */
+  void writeBool(int fieldNumber, boolean value);
+
+  /** Writes a field of type {@link FieldType#STRING}. */
+  void writeString(int fieldNumber, String value);
+
+  /** Writes a field of type {@link FieldType#BYTES}. */
+  void writeBytes(int fieldNumber, ByteString value);
+
+  /** Writes a field of type {@link FieldType#UINT32}. */
+  void writeUInt32(int fieldNumber, int value);
+
+  /** Writes a field of type {@link FieldType#SINT32}. */
+  void writeSInt32(int fieldNumber, int value);
+
+  /** Writes a field of type {@link FieldType#SINT64}. */
+  void writeSInt64(int fieldNumber, long value);
+
+  /** Writes a field of type {@link FieldType#MESSAGE}. */
+  void writeMessage(int fieldNumber, Object value);
+
+  /**
+   * Writes a field of type {@link FieldType#GROUP}.
+   *
+   * @deprecated groups fields are deprecated.
+   */
+  @Deprecated
+  void writeGroup(int fieldNumber, Object value);
+
+  /** Writes a list field of type {@link FieldType#INT32}. */
+  void writeInt32List(int fieldNumber, List<Integer> value, boolean packed);
+
+  /** Writes a list field of type {@link FieldType#FIXED32}. */
+  void writeFixed32List(int fieldNumber, List<Integer> value, boolean packed);
+
+  /** Writes a list field of type {@link FieldType#INT64}. */
+  void writeInt64List(int fieldNumber, List<Long> value, boolean packed);
+
+  /** Writes a list field of type {@link FieldType#UINT64}. */
+  void writeUInt64List(int fieldNumber, List<Long> value, boolean packed);
+
+  /** Writes a list field of type {@link FieldType#FIXED64}. */
+  void writeFixed64List(int fieldNumber, List<Long> value, boolean packed);
+
+  /** Writes a list field of type {@link FieldType#FLOAT}. */
+  void writeFloatList(int fieldNumber, List<Float> value, boolean packed);
+
+  /** Writes a list field of type {@link FieldType#DOUBLE}. */
+  void writeDoubleList(int fieldNumber, List<Double> value, boolean packed);
+
+  /** Writes a list field of type {@link FieldType#ENUM}. */
+  void writeEnumList(int fieldNumber, List<Integer> value, boolean packed);
+
+  /** Writes a list field of type {@link FieldType#BOOL}. */
+  void writeBoolList(int fieldNumber, List<Boolean> value, boolean packed);
+
+  /** Writes a list field of type {@link FieldType#STRING}. */
+  void writeStringList(int fieldNumber, List<String> value);
+
+  /** Writes a list field of type {@link FieldType#BYTES}. */
+  void writeBytesList(int fieldNumber, List<ByteString> value);
+
+  /** Writes a list field of type {@link FieldType#UINT32}. */
+  void writeUInt32List(int fieldNumber, List<Integer> value, boolean packed);
+
+  /** Writes a list field of type {@link FieldType#SFIXED32}. */
+  void writeSFixed32List(int fieldNumber, List<Integer> value, boolean packed);
+
+  /** Writes a list field of type {@link FieldType#SFIXED64}. */
+  void writeSFixed64List(int fieldNumber, List<Long> value, boolean packed);
+
+  /** Writes a list field of type {@link FieldType#SINT32}. */
+  void writeSInt32List(int fieldNumber, List<Integer> value, boolean packed);
+
+  /** Writes a list field of type {@link FieldType#SINT64}. */
+  void writeSInt64List(int fieldNumber, List<Long> value, boolean packed);
+
+  /** Writes a list field of type {@link FieldType#MESSAGE}. */
+  void writeMessageList(int fieldNumber, List<?> value);
+
+  /**
+   * Writes a list field of type {@link FieldType#GROUP}.
+   *
+   * @deprecated groups fields are deprecated.
+   */
+  @Deprecated
+  void writeGroupList(int fieldNumber, List<?> value);
+}