The setLanguageTag(String) method of java.util.Locale.Builder class in Java is used to reset this Locale.Builder to the specified IETF BCP 47 language tag. It means that this method will reset the current state of Locale.Builder instance to match the provided language tag and return it.
Syntax:
public Locale.Builder setLanguageTag(String languageTag)
Parameter: This method accepts the languageTag as the parameter which is the String that is to be set to this Locale.Builder instance.
Return Value: This method returns an Locale.Builder instance which is the state of this Locale.Builder set to the specified language tag.
Exception: This method throws following Exceptions:
- IllformedLocaleException: if the specified languageTag has any ill formed fields
Program 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 languageTag        // of Locale.Builder        String languageTag = "FRENCH";        System.out.println("Setting the language: "                           + languageTag);          localeBuilder            = localeBuilder                  .setLanguageTag(languageTag);          // Displaying Locale.Builder        System.out.println("Updated LocaleBuilder: "                           + localeBuilder);    }} |
Output:
LocaleBuilder: java.util.Locale$Builder@232204a1 Setting the language: FRENCH Updated LocaleBuilder: java.util.Locale$Builder@232204a1
Program 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 languageTag        // of Locale.Builder        String languageTag = "asdasf@!vsd#";        System.out.println("Setting the languageTag: "                           + languageTag);          try {            localeBuilder                = localeBuilder                      .setLanguageTag(languageTag);              // Displaying Locale.Builder            System.out.println("Updated LocaleBuilder: "                               + localeBuilder);        }        catch (Exception e) {            System.out.println(e);        }    }} |
Output:
LocaleBuilder: java.util.Locale$Builder@232204a1 Setting the languageTag: asdasf@!vsd# java.util.IllformedLocaleException: Invalid subtag: asdasf@!vsd# [at index 0]
