public RunInstancesRequest withImageId(String imageId) {
        setImageId(imageId);
        return this;
    }
<p>
The ID of the AMI. An AMI ID is required to launch an instance and must be specified here or in a launch
template.
</p>

@param imageId
       The ID of the AMI. An AMI ID is required to launch an instance and must be specified here or in a launch
       template.
@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/RunInstancesRequest.java