Java中的 Locale.Builder setRegion() 方法及示例

Java中Java .util.Locale.Builder 类的setRegion(String)方法用于将此Locale.Builder 设置为指定区域。这意味着此方法将设置 Locale.Builder 实例的当前区域以匹配提供的区域并返回它。如果指定区域为 null 或为空，则移除此 LocaleBuilder 的区域。格式正确的区域值由 ISO 3166 标准定义的 2 个字母的区域代码或 3 位的 UN M.49 区域代码组成。

句法：

public Locale.Builder setRegion(String region)

参数：此方法接受区域作为参数，该参数是要设置为此 Locale.Builder 实例的字符串。

返回值：该方法返回一个Locale.Builder实例，这个Locale.Builder的区域集到指定区域。

异常：此方法抛出以下异常：

• IllformedLocaleException : 如果指定区域有任何格式错误的字段

方案一：

// Java program to demonstrate
// the above method
  
import java.util.*;
import java.util.Locale.*;
  
public class LocaleBuilderDemo {
    public static void main(String[] args)
    {
  
        // Creating a new Locale.Builder
        Locale.Builder localeBuilder
            = new Builder();
  
        // Displaying Locale.Builder
        System.out.println("LocaleBuilder: "
                           + localeBuilder);
  
        // setting the region of Locale.Builder
        String region = "IN";
        System.out.println("Setting the region: "
                           + region);
  
        localeBuilder
            = localeBuilder.setRegion(region);
  
        // Displaying Locale.Builder
        System.out.println("Updated LocaleBuilder: "
                           + localeBuilder);
    }
}

输出：

LocaleBuilder: java.util.Locale$Builder@232204a1
Setting the region: IN
Updated LocaleBuilder: java.util.Locale$Builder@232204a1

方案二：

// Java program to demonstrate
// the above method
  
import java.util.*;
import java.util.Locale.*;
  
public class LocaleBuilderDemo {
    public static void main(String[] args)
    {
  
        // Creating a new Locale.Builder
        Locale.Builder localeBuilder
            = new Builder();
  
        // Displaying Locale.Builder
        System.out.println("LocaleBuilder: "
                           + localeBuilder);
  
        // setting the region of Locale.Builder
        String region = "asdasf@!vsd#";
        System.out.println("Setting the region: "
                           + region);
  
        try {
            localeBuilder
                = localeBuilder.setRegion(region);
  
            // Displaying Locale.Builder
            System.out.println("Updated LocaleBuilder: "
                               + localeBuilder);
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

LocaleBuilder: java.util.Locale$Builder@232204a1
Setting the region: asdasf@!vsd#
java.util.IllformedLocaleException:
 Ill-formed region:
 asdasf@!vsd# [at index 0]

参考： https://docs.oracle.com/javase/9/docs/api/ Java/util/Locale.Builder.html#setRegion-java.lang.String-