Locale getExtensionKeys() Method in Java with Examples

The getExtensionKeys() method of Locale class in Java is used to return a set of extension keys associated with this locale which cannot be modified and the keys remains in lower-case. If there is no extension then the method returns an empty set.

Syntax:

public Set <Character> getExtensionKeys()

Parameters: This method does not take any parameters.



Return Value: This method either returns a set of extension keys associated with this locale or an empty set if it has no extensions.

Below programs illustrate the working of getExtensionKeys() method:
Program 1:

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// Java code to illustrate
// getExtensionKeys() method
  
import java.util.*;
  
public class Locale_Demo {
    public static void main(String[] args)
    {
  
        // Creating a new locale
        Locale first_locale
            = new Locale("th", "TH", "TH");
  
        // Displaying first locale
        System.out.println("Locale: "
                           + first_locale);
  
        // Displaying the set
        System.out.println("The KeySet: "
                           + first_locale.getExtensionKeys());
    }
}

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Output:

Locale: th_TH_TH_#u-nu-thai
The KeySet: [u]

Program 2:

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// Java code to illustrate
// getExtensionKeys() method
  
import java.util.*;
  
public class Locale_Demo {
    public static void main(String[] args)
    {
  
        // Creating a new locale
        Locale first_locale
            = new Locale("en", "US");
  
        // Displaying first locale
        System.out.println("Locale: "
                           + first_locale);
  
        // Displaying the set
        System.out.println("The KeySet: "
                           + first_locale.getExtensionKeys());
    }
}

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Output:

Locale: en_US
The KeySet: []

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Locale.html#getExtensionKeys()



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