demo-protobuf/src/main/java/com/github/shoothzj/demo/protobuf/module/AddressBookProtos.java
public Builder clearNumber() {
          bitField0_ = (bitField0_ & ~0x00000001);
          number_ = getDefaultInstance().getNumber();
          onChanged();
          return this;
        }
/**
         * <code>optional string number = 1;</code>
         * @return This builder for chaining.
         */
optional string number = 1;
@return This builder for chaining.
optional string number = 1 ; @return This builder for chaining .
public Builder clearNumber() {
          bitField0_ = (bitField0_ & ~0x00000001);
          number_ = getDefaultInstance().getNumber();
          onChanged();
          return this;
        }
public Builder clearNumber ( ) { bitField0_ = ( bitField0_ & ~ 0x00000001 ) ; number_ = getDefaultInstance ( ) . getNumber ( ) ; onChanged ( ) ; return this ; }
<code>optional string number = 1;</code>
 @return This builder for chaining.
<code > optional string number = 1 ; < / code > @return This builder for chaining .