public ReplaceRootVolumeTask withImageId(String imageId) {
        setImageId(imageId);
        return this;
    }
<p>
The ID of the AMI used to create the replacement root volume.
</p>

@param imageId
       The ID of the AMI used to create the replacement root volume.
@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/ReplaceRootVolumeTask.java