Locale getDisplayLanguage() inLocale in Java

getDisplayLanguage(): This method is available in java.util.Locale class of Java.

Syntax:

String java.util.Locale.getDisplayLanguage(Locale inLocale)

This method takes one argument of type Locale as its parameter. This method returns a name for the locale's language that is appropriate for display to the user.

Parameters: One parameter is required for this method.

inLocale: The locale for which to retrieve the display language.

Returns: The name of the display language appropriate to the given locale.

Throws: NullPointerException - if inLocale is null.

For Example:

Locale locale = new Locale("en", "USA")

Locale inLocale = new Locale("fr", "FR")

locale.getDisplayLanguage() = > It returns anglais.

Approach: When inLocale is not null.

Java

import java.util.Locale;

public class LocalegetDisplayLanguage2 {
    public static void main(String[] args) {

        Locale locale = new Locale("en", "USA");

        Locale inLocale = new Locale("fr", "FR");
        System.out.println(locale.getDisplayLanguage(inLocale));
    }
}

Output:

anglais

Approach: When inLocale is null.

Java

import java.util.Locale;

public class LocalegetDisplayLanguage2 {
    public static void main(String[] args) {

        Locale locale = new Locale("en", "USA");

        Locale inLocale = null;
        System.out.println(locale.getDisplayLanguage(inLocale));
    }
}

Output:

Exception in thread "main" java.lang.NullPointerException
	at java.base/java.util.Objects.requireNonNull(Objects.java:208)
	at java.base/java.util.Locale.getDisplayString(Locale.java:1917)
	at java.base/java.util.Locale.getDisplayLanguage(Locale.java:1840)