Protocol Buffer 是使用 Google 開發的一種開源資料交換格式，獨立於語言，獨立於平臺，採用二進位制傳輸。

Protobuffer 語法

識別符號

Protobuffer 協議的識別符號為 message 或 enum，message 代表訊息型別，enum 代表列舉型別，在通過Protobuffer 編譯器編譯之後，都生成 Java 的一個類。

修飾符

協議欄位格式：role type name = tag [default value];

其中，role 有以下三種取值：

• required：該欄位不能為空，必須傳遞值，否則 message 不能被正確初始化。
• optional：該欄位可以為空，不管該欄位是否傳值，message 都能正確初始化。
• repeated：重複的欄位，等同動態陣列，編譯成 Java 後即為 List，其資料可以為空。

資料型別

Package

在 Proto 檔案中，可以用 Package 指定 Java 的包名，如：

package demo;

Option

Option 可以定義一些常用選項，如：

• java_package：指定 Java 檔案的包名，並輸出到指定目錄下。
• java_outer_classname：指定 Java 檔案的類名。
• optimize_for：
  • SPEED：預設條件，生成程式碼效率高，程式碼佔用空間大。
  • CODE：生成程式碼佔用空間小，效率低。
  • LITE_RUNTIME：生成的程式碼效率高，佔用空間小，但反射功能較弱。

Idea 配置 Maven 和 Protobuffer

安裝Protobuf Support外掛。

pom.xml 檔案配置

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com</groupId>
    <artifactId>Protobuffer</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <grpc.version>1.6.1</grpc.version>
        <protobuf.version>3.3.0</protobuf.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-netty</artifactId>
            <version>${grpc.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-protobuf</artifactId>
            <version>${grpc.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-stub</artifactId>
            <version>${grpc.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java</artifactId>
            <version>${protobuf.version}</version>
        </dependency>
    </dependencies>

    <build>
        <extensions>
            <extension>
                <groupId>kr.motd.maven</groupId>
                <artifactId>os-maven-plugin</artifactId>
                <version>1.5.0.Final</version>
            </extension>
        </extensions>
        <plugins>
            <plugin>
                <groupId>org.xolstice.maven.plugins</groupId>
                <artifactId>protobuf-maven-plugin</artifactId>
                <version>0.5.0</version>
                <configuration>
                    <protocArtifact>
                        com.google.protobuf:protoc:${protobuf.version}:exe:${os.detected.classifier}
                    </protocArtifact>
                    <pluginId>grpc-java</pluginId>
                    <pluginArtifact>
                        io.grpc:protoc-gen-grpc-java:${grpc.version}:exe:${os.detected.classifier}
                    </pluginArtifact>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>compile-custom</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

編譯：Maven-Compile

即可在 target/generated-sources/protobuf/java 中找到編譯好的 Java 類。

如果.proto檔案中，顯示“File not found”提示，一般是未設定.proto檔案所在資料夾為原始檔，需要在.proto檔案所在的資料夾上右鍵，設定目錄為原始檔根目錄。

示例

demo.proto

option java_outer_classname = "DemoProto";

message Obj1 {
	required int32 val1 = 1;
	repeated Obj2 val2 = 2;
}

message Obj2 {
	required string subval1 = 1;
	optional double subval2 = 2;
}

PbDemo.java

import proto.DemoProto.Obj1;
import proto.DemoProto.Obj2;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class PbDemo {
    public static void main(String[] args) {
        PbDemo demo = new PbDemo();
        demo.run();
    }

    public void run() {
        // 構建Protocol Javabean
        Obj1.Builder obj1 = Obj1.newBuilder();
        obj1.setVal1(1);
        Obj2.Builder obj21 = Obj2.newBuilder();
        obj21.setSubval1("protocol buffer demo 1");
        obj21.setSubval2(1.9999d);
        obj1.addVal2(obj21);
        Obj2.Builder obj22 = Obj2.newBuilder();
        obj22.setSubval1("protocol buffer demo 2");
        obj22.setSubval2(1.9999d);
        obj1.addVal2(obj22);


        System.out.println("obj1:");
        System.out.println(obj1);
        System.out.println("obj1.build:");
        System.out.println(obj1.build());
        // 接收到的proto直接對應Protocol Javabean
        System.out.println("接收到的proto直接對應Protocol Javabean");
        System.out.println("val1:" + obj1.getVal1());
        System.out.println("val2:" + obj1.getVal2List());

        System.out.println("=====序列化=====");
        try {
            obj1.build().writeTo(new FileOutputStream("Protobuffer/src/main/resources/proto.ser"));
            DemoProto.Obj1 obj = DemoProto.Obj1.parseFrom(new FileInputStream("Protobuffer/src/main/resources/proto.ser"));
            System.out.println(obj);
            System.out.println(obj.getVal1());
            System.out.println(obj.getVal2List());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

proto.ser


!
protocol buffer demo 1St$—ÿÿ?!
protocol buffer demo 2St$—ÿÿ?

DemoProto.java（自動生成，不必修改）

package proto;// Generated by the protocol buffer compiler.  DO NOT EDIT!
// source: demo.proto

public final class DemoProto {
  private DemoProto() {}
  public static void registerAllExtensions(
      com.google.protobuf.ExtensionRegistryLite registry) {
  }

  public static void registerAllExtensions(
      com.google.protobuf.ExtensionRegistry registry) {
    registerAllExtensions(
        (com.google.protobuf.ExtensionRegistryLite) registry);
  }
  public interface Obj1OrBuilder extends
      // @@protoc_insertion_point(interface_extends:Obj1)
      com.google.protobuf.MessageOrBuilder {

    /**
     * <code>required int32 val1 = 1;</code>
     */
    boolean hasVal1();
    /**
     * <code>required int32 val1 = 1;</code>
     */
    int getVal1();

    /**
     * <code>repeated .Obj2 val2 = 2;</code>
     */
    java.util.List<Obj2>
        getVal2List();
    /**
     * <code>repeated .Obj2 val2 = 2;</code>
     */
    DemoProto.Obj2 getVal2(int index);
    /**
     * <code>repeated .Obj2 val2 = 2;</code>
     */
    int getVal2Count();
    /**
     * <code>repeated .Obj2 val2 = 2;</code>
     */
    java.util.List<? extends Obj2OrBuilder>
        getVal2OrBuilderList();
    /**
     * <code>repeated .Obj2 val2 = 2;</code>
     */
    DemoProto.Obj2OrBuilder getVal2OrBuilder(
            int index);
  }
  /**
   * Protobuf type {@code Obj1}
   */
  public  static final class Obj1 extends
      com.google.protobuf.GeneratedMessageV3 implements
      // @@protoc_insertion_point(message_implements:Obj1)
      Obj1OrBuilder {
    // Use Obj1.newBuilder() to construct.
    private Obj1(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
      super(builder);
    }
    private Obj1() {
      val1_ = 0;
      val2_ = java.util.Collections.emptyList();
    }

    @Override
    public final com.google.protobuf.UnknownFieldSet
    getUnknownFields() {
      return this.unknownFields;
    }
    private Obj1(
        com.google.protobuf.CodedInputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      this();
      int mutable_bitField0_ = 0;
      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
          com.google.protobuf.UnknownFieldSet.newBuilder();
      try {
        boolean done = false;
        while (!done) {
          int tag = input.readTag();
          switch (tag) {
            case 0:
              done = true;
              break;
            default: {
              if (!parseUnknownField(input, unknownFields,
                                     extensionRegistry, tag)) {
                done = true;
              }
              break;
            }
            case 8: {
              bitField0_ |= 0x00000001;
              val1_ = input.readInt32();
              break;
            }
            case 18: {
              if (!((mutable_bitField0_ & 0x00000002) == 0x00000002)) {
                val2_ = new java.util.ArrayList<Obj2>();
                mutable_bitField0_ |= 0x00000002;
              }
              val2_.add(
                  input.readMessage(DemoProto.Obj2.PARSER, extensionRegistry));
              break;
            }
          }
        }
      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
        throw e.setUnfinishedMessage(this);
      } catch (java.io.IOException e) {
        throw new com.google.protobuf.InvalidProtocolBufferException(
            e).setUnfinishedMessage(this);
      } finally {
        if (((mutable_bitField0_ & 0x00000002) == 0x00000002)) {
          val2_ = java.util.Collections.unmodifiableList(val2_);
        }
        this.unknownFields = unknownFields.build();
        makeExtensionsImmutable();
      }
    }
    public static final com.google.protobuf.Descriptors.Descriptor
        getDescriptor() {
      return DemoProto.internal_static_Obj1_descriptor;
    }

    protected FieldAccessorTable
        internalGetFieldAccessorTable() {
      return DemoProto.internal_static_Obj1_fieldAccessorTable
          .ensureFieldAccessorsInitialized(
              DemoProto.Obj1.class, DemoProto.Obj1.Builder.class);
    }

    private int bitField0_;
    public static final int VAL1_FIELD_NUMBER = 1;
    private int val1_;
    /**
     * <code>required int32 val1 = 1;</code>
     */
    public boolean hasVal1() {
      return ((bitField0_ & 0x00000001) == 0x00000001);
    }
    /**
     * <code>required int32 val1 = 1;</code>
     */
    public int getVal1() {
      return val1_;
    }

    public static final int VAL2_FIELD_NUMBER = 2;
    private java.util.List<Obj2> val2_;
    /**
     * <code>repeated .Obj2 val2 = 2;</code>
     */
    public java.util.List<Obj2> getVal2List() {
      return val2_;
    }
    /**
     * <code>repeated .Obj2 val2 = 2;</code>
     */
    public java.util.List<? extends Obj2OrBuilder>
        getVal2OrBuilderList() {
      return val2_;
    }
    /**
     * <code>repeated .Obj2 val2 = 2;</code>
     */
    public int getVal2Count() {
      return val2_.size();
    }
    /**
     * <code>repeated .Obj2 val2 = 2;</code>
     */
    public DemoProto.Obj2 getVal2(int index) {
      return val2_.get(index);
    }
    /**
     * <code>repeated .Obj2 val2 = 2;</code>
     */
    public DemoProto.Obj2OrBuilder getVal2OrBuilder(
        int index) {
      return val2_.get(index);
    }

    private byte memoizedIsInitialized = -1;
    public final boolean isInitialized() {
      byte isInitialized = memoizedIsInitialized;
      if (isInitialized == 1) return true;
      if (isInitialized == 0) return false;

      if (!hasVal1()) {
        memoizedIsInitialized = 0;
        return false;
      }
      for (int i = 0; i < getVal2Count(); i++) {
        if (!getVal2(i).isInitialized()) {
          memoizedIsInitialized = 0;
          return false;
        }
      }
      memoizedIsInitialized = 1;
      return true;
    }

    public void writeTo(com.google.protobuf.CodedOutputStream output)
                        throws java.io.IOException {
      if (((bitField0_ & 0x00000001) == 0x00000001)) {
        output.writeInt32(1, val1_);
      }
      for (int i = 0; i < val2_.size(); i++) {
        output.writeMessage(2, val2_.get(i));
      }
      unknownFields.writeTo(output);
    }

    public int getSerializedSize() {
      int size = memoizedSize;
      if (size != -1) return size;

      size = 0;
      if (((bitField0_ & 0x00000001) == 0x00000001)) {
        size += com.google.protobuf.CodedOutputStream
          .computeInt32Size(1, val1_);
      }
      for (int i = 0; i < val2_.size(); i++) {
        size += com.google.protobuf.CodedOutputStream
          .computeMessageSize(2, val2_.get(i));
      }
      size += unknownFields.getSerializedSize();
      memoizedSize = size;
      return size;
    }

    private static final long serialVersionUID = 0L;
    @Override
    public boolean equals(final Object obj) {
      if (obj == this) {
       return true;
      }
      if (!(obj instanceof DemoProto.Obj1)) {
        return super.equals(obj);
      }
      DemoProto.Obj1 other = (DemoProto.Obj1) obj;

      boolean result = true;
      result = result && (hasVal1() == other.hasVal1());
      if (hasVal1()) {
        result = result && (getVal1()
            == other.getVal1());
      }
      result = result && getVal2List()
          .equals(other.getVal2List());
      result = result && unknownFields.equals(other.unknownFields);
      return result;
    }

    @Override
    public int hashCode() {
      if (memoizedHashCode != 0) {
        return memoizedHashCode;
      }
      int hash = 41;
      hash = (19 * hash) + getDescriptor().hashCode();
      if (hasVal1()) {
        hash = (37 * hash) + VAL1_FIELD_NUMBER;
        hash = (53 * hash) + getVal1();
      }
      if (getVal2Count() > 0) {
        hash = (37 * hash) + VAL2_FIELD_NUMBER;
        hash = (53 * hash) + getVal2List().hashCode();
      }
      hash = (29 * hash) + unknownFields.hashCode();
      memoizedHashCode = hash;
      return hash;
    }

    public static DemoProto.Obj1 parseFrom(
        java.nio.ByteBuffer data)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data);
    }
    public static DemoProto.Obj1 parseFrom(
        java.nio.ByteBuffer data,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static DemoProto.Obj1 parseFrom(
        com.google.protobuf.ByteString data)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data);
    }
    public static DemoProto.Obj1 parseFrom(
        com.google.protobuf.ByteString data,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static DemoProto.Obj1 parseFrom(byte[] data)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data);
    }
    public static DemoProto.Obj1 parseFrom(
        byte[] data,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static DemoProto.Obj1 parseFrom(java.io.InputStream input)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseWithIOException(PARSER, input);
    }
    public static DemoProto.Obj1 parseFrom(
        java.io.InputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseWithIOException(PARSER, input, extensionRegistry);
    }
    public static DemoProto.Obj1 parseDelimitedFrom(java.io.InputStream input)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseDelimitedWithIOException(PARSER, input);
    }
    public static DemoProto.Obj1 parseDelimitedFrom(
        java.io.InputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
    }
    public static DemoProto.Obj1 parseFrom(
        com.google.protobuf.CodedInputStream input)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseWithIOException(PARSER, input);
    }
    public static DemoProto.Obj1 parseFrom(
        com.google.protobuf.CodedInputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseWithIOException(PARSER, input, extensionRegistry);
    }

    public Builder newBuilderForType() { return newBuilder(); }
    public static Builder newBuilder() {
      return DEFAULT_INSTANCE.toBuilder();
    }
    public static Builder newBuilder(DemoProto.Obj1 prototype) {
      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
    }
    public Builder toBuilder() {
      return this == DEFAULT_INSTANCE
          ? new Builder() : new Builder().mergeFrom(this);
    }

    @Override
    protected Builder newBuilderForType(
        BuilderParent parent) {
      Builder builder = new Builder(parent);
      return builder;
    }
    /**
     * Protobuf type {@code Obj1}
     */
    public static final class Builder extends
        com.google.protobuf.GeneratedMessageV3.Builder<Builder> implements
        // @@protoc_insertion_point(builder_implements:Obj1)
        DemoProto.Obj1OrBuilder {
      public static final com.google.protobuf.Descriptors.Descriptor
          getDescriptor() {
        return DemoProto.internal_static_Obj1_descriptor;
      }

      protected FieldAccessorTable
          internalGetFieldAccessorTable() {
        return DemoProto.internal_static_Obj1_fieldAccessorTable
            .ensureFieldAccessorsInitialized(
                DemoProto.Obj1.class, DemoProto.Obj1.Builder.class);
      }

      // Construct using DemoProto.Obj1.newBuilder()
      private Builder() {
        maybeForceBuilderInitialization();
      }

      private Builder(
          BuilderParent parent) {
        super(parent);
        maybeForceBuilderInitialization();
      }
      private void maybeForceBuilderInitialization() {
        if (com.google.protobuf.GeneratedMessageV3
                .alwaysUseFieldBuilders) {
          getVal2FieldBuilder();
        }
      }
      public Builder clear() {
        super.clear();
        val1_ = 0;
        bitField0_ = (bitField0_ & ~0x00000001);
        if (val2Builder_ == null) {
          val2_ = java.util.Collections.emptyList();
          bitField0_ = (bitField0_ & ~0x00000002);
        } else {
          val2Builder_.clear();
        }
        return this;
      }

      public com.google.protobuf.Descriptors.Descriptor
          getDescriptorForType() {
        return DemoProto.internal_static_Obj1_descriptor;
      }

      public DemoProto.Obj1 getDefaultInstanceForType() {
        return DemoProto.Obj1.getDefaultInstance();
      }

      public DemoProto.Obj1 build() {
        DemoProto.Obj1 result = buildPartial();
        if (!result.isInitialized()) {
          throw newUninitializedMessageException(result);
        }
        return result;
      }

      public DemoProto.Obj1 buildPartial() {
        DemoProto.Obj1 result = new DemoProto.Obj1(this);
        int from_bitField0_ = bitField0_;
        int to_bitField0_ = 0;
        if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
          to_bitField0_ |= 0x00000001;
        }
        result.val1_ = val1_;
        if (val2Builder_ == null) {
          if (((bitField0_ & 0x00000002) == 0x00000002)) {
            val2_ = java.util.Collections.unmodifiableList(val2_);
            bitField0_ = (bitField0_ & ~0x00000002);
          }
          result.val2_ = val2_;
        } else {
          result.val2_ = val2Builder_.build();
        }
        result.bitField0_ = to_bitField0_;
        onBuilt();
        return result;
      }

      public Builder clone() {
        return (Builder) super.clone();
      }
      public Builder setField(
          com.google.protobuf.Descriptors.FieldDescriptor field,
          Object value) {
        return (Builder) super.setField(field, value);
      }
      public Builder clearField(
          com.google.protobuf.Descriptors.FieldDescriptor field) {
        return (Builder) super.clearField(field);
      }
      public Builder clearOneof(
          com.google.protobuf.Descriptors.OneofDescriptor oneof) {
        return (Builder) super.clearOneof(oneof);
      }
      public Builder setRepeatedField(
          com.google.protobuf.Descriptors.FieldDescriptor field,
          int index, Object value) {
        return (Builder) super.setRepeatedField(field, index, value);
      }
      public Builder addRepeatedField(
          com.google.protobuf.Descriptors.FieldDescriptor field,
          Object value) {
        return (Builder) super.addRepeatedField(field, value);
      }
      public Builder mergeFrom(com.google.protobuf.Message other) {
        if (other instanceof DemoProto.Obj1) {
          return mergeFrom((DemoProto.Obj1)other);
        } else {
          super.mergeFrom(other);
          return this;
        }
      }

      public Builder mergeFrom(DemoProto.Obj1 other) {
        if (other == DemoProto.Obj1.getDefaultInstance()) return this;
        if (other.hasVal1()) {
          setVal1(other.getVal1());
        }
        if (val2Builder_ == null) {
          if (!other.val2_.isEmpty()) {
            if (val2_.isEmpty()) {
              val2_ = other.val2_;
              bitField0_ = (bitField0_ & ~0x00000002);
            } else {
              ensureVal2IsMutable();
              val2_.addAll(other.val2_);
            }
            onChanged();
          }
        } else {
          if (!other.val2_.isEmpty()) {
            if (val2Builder_.isEmpty()) {
              val2Builder_.dispose();
              val2Builder_ = null;
              val2_ = other.val2_;
              bitField0_ = (bitField0_ & ~0x00000002);
              val2Builder_ =
                com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders ?
                   getVal2FieldBuilder() : null;
            } else {
              val2Builder_.addAllMessages(other.val2_);
            }
          }
        }
        this.mergeUnknownFields(other.unknownFields);
        onChanged();
        return this;
      }

      public final boolean isInitialized() {
        if (!hasVal1()) {
          return false;
        }
        for (int i = 0; i < getVal2Count(); i++) {
          if (!getVal2(i).isInitialized()) {
            return false;
          }
        }
        return true;
      }

      public Builder mergeFrom(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws java.io.IOException {
        DemoProto.Obj1 parsedMessage = null;
        try {
          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
          parsedMessage = (DemoProto.Obj1) e.getUnfinishedMessage();
          throw e.unwrapIOException();
        } finally {
          if (parsedMessage != null) {
            mergeFrom(parsedMessage);
          }
        }
        return this;
      }
      private int bitField0_;

      private int val1_ ;
      /**
       * <code>required int32 val1 = 1;</code>
       */
      public boolean hasVal1() {
        return ((bitField0_ & 0x00000001) == 0x00000001);
      }
      /**
       * <code>required int32 val1 = 1;</code>
       */
      public int getVal1() {
        return val1_;
      }
      /**
       * <code>required int32 val1 = 1;</code>
       */
      public Builder setVal1(int value) {
        bitField0_ |= 0x00000001;
        val1_ = value;
        onChanged();
        return this;
      }
      /**
       * <code>required int32 val1 = 1;</code>
       */
      public Builder clearVal1() {
        bitField0_ = (bitField0_ & ~0x00000001);
        val1_ = 0;
        onChanged();
        return this;
      }

      private java.util.List<Obj2> val2_ =
        java.util.Collections.emptyList();
      private void ensureVal2IsMutable() {
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        onChanged();
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      }
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        if (value == null) {
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      }

      private double subval2_ ;
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       */
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       * <code>optional double subval2 = 2;</code>
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       * <code>optional double subval2 = 2;</code>
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        return this;
      }
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        return this;
      }
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      "l2\030\002 \003(\0132\005.Obj2\"(\n\004Obj2\022\017\n\007subval1\030\001 \002(\t" +
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  // @@protoc_insertion_point(outer_class_scope)
}