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

Java中Java .util.Locale.Builder 类的setVariant(String)方法用于将此 Locale.Builder 设置为指定的变体。这意味着此方法将设置 Locale.Builder 实例的当前变体以匹配提供的变体并返回它。如果指定的变体为 null 或为空，则移除此 LocaleBuilder 的变体。根据 IETF BCP 47 变体子标签的语法要求检查指定的变体，然后将其标准化为小写。

句法：

public Locale.Builder setVariant(String variant)

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

返回值：此方法返回一个Locale.Builder 实例，其中包含此 Locale.Builder 的变体集到指定的变体。

异常：此方法抛出以下异常：

• IllformedLocaleException : 如果指定的变体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 variant of Locale.Builder
        String variant
            = (new Locale("nu", "NO", "NY"))
                  .getDisplayVariant();
        System.out.println("Setting the variant: "
                           + variant);
  
        localeBuilder
            = localeBuilder.setVariant(variant);
  
        // Displaying Locale.Builder
        System.out.println("Updated LocaleBuilder: "
                           + localeBuilder);
    }
}

输出：

LocaleBuilder: java.util.Locale$Builder@232204a1
Setting the variant: Nynorsk
Updated LocaleBuilder: java.util.Locale$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 variant of Locale.Builder
        String variant = "asdasf@!vsd#";
        System.out.println("Setting the variant: "
                           + variant);
          
        try{
        localeBuilder
            = localeBuilder.setVariant(variant);
  
        // 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 variant: asdasf@!vsd#
java.util.IllformedLocaleException:
 Ill-formed variant:
 asdasf@!vsd# [at index 0]

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