google-cloud-java/java-translate/.readme-partials.yaml at main · googleapis/google-cloud-java · GitHub

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### Example Application

[`TranslateExample`](https://github.com/googleapis/google-cloud-java/blob/master/google-cloud-examples/src/main/java/com/google/cloud/examples/translate/TranslateExample.java)

is a simple command line interface that provides some of Google Translation's functionality.

#### Creating an authorized service object

To make authenticated requests to Google Translation, you must create a service object with

credentials or use an API key. The simplest way to authenticate is to use

[Application Default Credentials](https://developers.google.com/identity/protocols/application-default-credentials).

These credentials are automatically inferred from your environment, so you only need the following

code to create your service object:

```java

import com.google.cloud.translate.Translate;

import com.google.cloud.translate.TranslateOptions;

Translate translate = TranslateOptions.getDefaultInstance().getService();

```

Notice that this code can be also used with an API key. By default, an API key is looked for in the

`GOOGLE_API_KEY` environment variable. Once the API key is set, you can make API calls by invoking

methods on the Translation service created via `TranslateOptions.getDefaultInstance().getService()`.

You can also explicitly set the API key as follows:

```java

Translate translate = TranslateOptions.newBuilder().setApiKey("myKey").build().getService();

```

#### Detecting language

With Google Translation you can detect the language of some text. The service will provide you with

the code of the detected language and a level of confidence.

Add the following import at the top of your file:

```java

import com.google.cloud.translate.Detection;

```

Then pick a text sample:

```java

final String mysteriousText = "Hola Mundo";

```

Then add the following code to detect the text's language:

```java

Detection detection = translate.detect(mysteriousText);

String detectedLanguage = detection.getLanguage();

```

#### Translating text

Google translation allows you to translate some text. When translating one or more texts you can

either provide the source language or let the service detect it for you.

Add the following imports at the top of your file:

```java

import com.google.cloud.translate.Translate.TranslateOption;

import com.google.cloud.translate.Translation;

```

Then add the following code to translate the text, specifying the previously detected language (`detectedLanguage`) as its source language and English as the target language (providing the source language is optional, if it is not specified the service will try to detect it automatically):

```java

Translation translation = translate.translate(

mysteriousText,

TranslateOption.sourceLanguage(detectedLanguage),

TranslateOption.targetLanguage("en"));

```

#### Complete source code

[DetectLanguageAndTranslate.java](https://github.com/googleapis/google-cloud-java/tree/master/google-cloud-examples/src/main/java/com/google/cloud/examples/translate/snippets/DetectLanguageAndTranslate.java)

we put together all the code shown above into one program. The program assumes that either Application

Default Credentials or a valid API key are available.

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