public CreateVolumePermission withUserId(String userId) {
        setUserId(userId);
        return this;
    }
<p>
The ID of the Amazon Web Services account to be added or removed.
</p>

@param userId
       The ID of the Amazon Web Services account to be added or removed.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/CreateVolumePermission.java