Java Locale.Builder setExtension()用法及代碼示例

Java中java.util.Locale.Builder類的setExtension()方法用於將此Locale.Builder設置為指定的擴展鍵。這意味著此方法將設置Locale.Builder實例的當前擴展名，以匹配提供的擴展名和值並返回。如果指定的擴展名為null或為空，則將刪除此LocaleBuilder的擴展。將對照LDML BCP 47兼容擴展名檢查指定的擴展名。

用法:

public Locale.Builder setExtension(
                          char extensionKey, 
                          String extensionValue)

參數：此方法接受兩個參數：

extensionKey：字符值將被設置為此Locale> Builder實例。
extensionValue：將String值設置為此Locale> Builder實例。

返回值：此方法返回一個Locale.Builder實例，並將此Locale.Builder的擴展名設置為指定的擴展名。

異常：此方法引發以下異常：

IllformedLocaleException：如果指定的擴展名有任何格式錯誤的字段

程序1:

// 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 extension of Locale.Builder 
        char extensionKey = 'u'; 
        String extensionValue = "ca-japanese"; 
        System.out.println("Setting the extension:"
                           + extensionKey + "/"
                           + extensionValue); 
  
        localeBuilder 
            = localeBuilder 
                  .setExtension(extensionKey, 
                                extensionValue); 
  
        // Displaying Locale.Builder 
        System.out.println("Updated LocaleBuilder:"
                           + localeBuilder); 
    } 
}

輸出：

LocaleBuilder:java.util.Locale$Builder@232204a1
Setting the extension:u/ca-japanese
Updated LocaleBuilder:java.util.Locale$Builder@232204a1

程序2:

// 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 extension of Locale.Builder 
        char extensionKey = '@'; 
        String extensionValue = "fsdf#"; 
        System.out.println("Setting the extension:"
                           + extensionKey + "/"
                           + extensionValue); 
  
        try { 
  
            localeBuilder 
                = localeBuilder 
                      .setExtension(extensionKey, 
                                    extensionValue); 
  
            // Displaying Locale.Builder 
            System.out.println("Updated LocaleBuilder:"
                               + localeBuilder); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

輸出：

LocaleBuilder:java.util.Locale$Builder@232204a1
Setting the extension:@/fsdf#
java.util.IllformedLocaleException:
 Ill-formed extension key:
 @ [at index 0]

參考： https://docs.oracle.com/javase/9/docs/api/java/util/Locale.Builder.html#setExtension-char-java.lang.String-

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