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How to use Locale.Builder function in Java for locale setting

Jun 26, 2023 pm 02:40 PM
java locale builder

With the development of the Internet, more and more applications need to make relevant settings based on the region where the user is located. In Java, we can use Locale class to set the region. The Locale.Builder function can help us make more detailed regional settings. This article will introduce how to use the Locale.Builder function in Java for locale settings.

1. Introduction to the Locale class

In Java, the Locale class is used to represent the settings of a specific geographical, political or cultural area. The Locale class is an immutable class that contains the following information:

  • Language
  • Country code
  • Optional extensions (such as currency symbol)
  • Optional variants (e.g. US English and British English).

2. Locale.Builder function

Locale.Builder is an internal class that allows us to create Locale objects in different ways. Locale.Builder can help us make regional settings more convenient and flexible.

Using Locale.Builder, the properties we can set include:

  • Language
  • Country/region code
  • Script
  • Variation
  • Extension

For example, to create a Locale object representing the United States, we can use the following code:

Locale.Builder builder = new Locale.Builder();
builder.setRegion("US");
Locale locale = builder.build();
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In the above code, we first Create a Locale.Builder object, then use the setRegion method to set the region to the United States, and finally use the build method to build the Locale object.

Below we will introduce in detail how to use the Locale.Builder function to set the region.

3. Setting the language

It is very simple to set the language using Locale.Builder. We only need to call the setLanguage method of Locale.Builder and pass in the required language code, for example:

Locale.Builder builder = new Locale.Builder();
builder.setLanguage("en");//设置语言为英语
Locale locale = builder.build();
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In the above code, we set the language of the Locale object to English.

If the Locale object we want to create also sets the country/region code and script, we can achieve it through the following code:

Locale.Builder builder = new Locale.Builder();
builder.setLanguage("en");//设置语言为英语
builder.setRegion("US");//设置国家/地区代码为美国
builder.setScript("Latn");//设置脚本为拉丁字母
Locale locale = builder.build();
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In the above code, we set the language of the Locale object , country code and script.

4. Setting the country/region code

Setting the country/region code of the Locale object is also very simple. You only need to use the setRegion method of Locale.Builder, for example:

Locale.Builder builder = new Locale.Builder();
builder.setRegion("US");//设置国家/地区代码为美国
Locale locale = builder.build();
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In the above code, we set the country code of the Locale object to the United States.

5. Setting scripts

Locale object scripts can be used to identify speech features or writing system variants. Setting the script using Locale.Builder is also very simple. You only need to use the setScript method, for example:

Locale.Builder builder = new Locale.Builder();
builder.setScript("Latn");//设置脚本为拉丁字母
Locale locale = builder.build();
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In the above code, we set the script of the Locale object to Latin letters.

6. Set variants

Variants of Locale objects can be used to distinguish different languages ​​or dialects. Setting variants using Locale.Builder is also very simple. You only need to use the setVariant method, for example:

Locale.Builder builder = new Locale.Builder();
builder.setVariant("SC");//设置变体为简体中文
Locale locale = builder.build();
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In the above code, we set the variant of the Locale object to Simplified Chinese.

7. Setting extensions

The extension of the Locale object can be used to support some special requirements, such as different currency symbols. Setting an extension using Locale.Builder is also very simple. You only need to use the setExtension method, for example:

Locale.Builder builder = new Locale.Builder();
builder.setExtension('c', "USD");//设置货币代码为美元
Locale locale = builder.build();
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In the above code, we set the extension of the Locale object to USD.

8. Summary

In this article, we introduced how to use the Locale.Builder function in Java to set the region. By using the Locale.Builder function, we can make more granular locale settings, including language, country code, scripts, variants and extensions. Understanding these features can help us better handle internationalization and localization issues and provide a better user experience for our applications.

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