// Import classes:
//import com.ahasend.client.ApiClient;
//import com.ahasend.client.ApiException;
//import com.ahasend.client.Configuration;
//import com.ahasend.client.auth.*;
//import com.ahasend.client.api.EmailApi;

ApiClient defaultClient = Configuration.getDefaultApiClient();

// Configure API key authorization: api_key
ApiKeyAuth api_key = (ApiKeyAuth) defaultClient.getAuthentication("api_key");
api_key.setApiKey("YOUR API KEY");
// Uncomment the following line to set a prefix for the API key, e.g. "Token" (defaults to null)
//api_key.setApiKeyPrefix("Token");

EmailApi apiInstance = new EmailApi();
Email body = new Email(); // Email | Email object.
String contentType = "contentType_example"; // String | Only application/json is supported
try {
    SuccessfulResponse result = apiInstance.sendEmail(body, contentType);
    System.out.println(result);
} catch (ApiException e) {
    System.err.println("Exception when calling EmailApi#sendEmail");
    e.printStackTrace();
}