public void setInstanceId(String instanceId) {
        this.instanceId = instanceId;
    }
<p>
The instance ID, if an instance has been launched to fulfill the Spot Instance request.
</p>

@param instanceId
       The instance ID, if an instance has been launched to fulfill the Spot Instance request.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/SpotInstanceRequest.java