// Import classes:
import com.onesignal.client.ApiClient;
import com.onesignal.client.ApiException;
import com.onesignal.client.Configuration;
import com.onesignal.client.auth.*;
import com.onesignal.client.models.*;
import com.onesignal.client.api.DefaultApi;

public class Example {
  private static final String appId = "YOUR_APP_ID";
  private static final String restApiKey = "YOUR_REST_API_KEY"; // App REST API key required for most endpoints
  private static final String organizationApiKey = "YOUR_ORGANIZATION_API_KEY"; // Organization key is only required for creating new apps and other top-level endpoints

  private static Notification createNotification() {
    Notification notification = new Notification();
    notification.setAppId(appId);
    notification.setIsChrome(true);
    notification.setIsAnyWeb(true);
    notification.setIncludedSegments(Arrays.asList(new String[]{"Subscribed Users"}));
    StringMap contentStringMap = new StringMap();
    contentStringMap.en("Test");
    notification.setContents(contentStringMap);

    return notification;
  }

  public static void main(String[] args) {
    // Setting up the client
    ApiClient defaultClient = Configuration.getDefaultApiClient();
    HttpBearerAuth restApiAuth = (HttpBearerAuth) defaultClient.getAuthentication("rest_api_key");
    restApiAuth.setBearerToken(restApiKey);
    HttpBearerAuth organizationApiAuth = (HttpBearerAuth) defaultClient.getAuthentication("organization_api_key");
    organizationApiAuth.setBearerToken(organizationApiKey);
    api = new DefaultApi(defaultClient);

    // Setting up the notification
    Notification notification = createNotification();

    // Sending the request
    CreateNotificationSuccessResponse response = api.createNotification(notification);

    // Checking the result
    System.out.print(response.getId();
  }
}