NetworkService.java

public class NetworkService {

  @IntDef({OK, SV_DOWN, SV_INVALID, UNKNOWN})
  @Retention(RetentionPolicy.SOURCE)
  public @interface Response{}

  public static final int OK = 0;
  public static final int SV_DOWN = 1;
  public static final int SV_INVALID = 2;
  public static final int UNKNOWN = 3;

  public static void setResponse(@Response int response) {
      //do stuff
  }

}