public Builder mergeCustomClass(com.google.cloud.speech.v1p1beta1.CustomClass value) {
      if (customClassBuilder_ == null) {
        if (((bitField0_ & 0x00000004) != 0)
            && customClass_ != null
            && customClass_ != com.google.cloud.speech.v1p1beta1.CustomClass.getDefaultInstance()) {
          getCustomClassBuilder().mergeFrom(value);
        } else {
          customClass_ = value;
        }
      } else {
        customClassBuilder_.mergeFrom(value);
      }
      if (customClass_ != null) {
        bitField0_ |= 0x00000004;
        onChanged();
      }
      return this;
    }
<pre>
Required. The custom class to create.
</pre>

<code>
.google.cloud.speech.v1p1beta1.CustomClass custom_class = 3 [(.google.api.field_behavior) = REQUIRED];
</code>
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/CreateCustomClassRequest.java