public void setImageArn(String imageArn) {
        this.imageArn = imageArn;
    }
<p>
The ARN of the public, private, or shared image to use.
</p>

@param imageArn
       The ARN of the public, private, or shared image to use.
aws-java-sdk-appstream/src/main/java/com/amazonaws/services/appstream/model/UpdateFleetRequest.java