TimeZone getDisplayName(Locale) in Java

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

Syntax:

String java.util.TimeZone.getDisplayName(Locale locale)

This method takes one argument. This method returns a long standard time name of this TimeZone suitable for presentation to the user in the specified locale.

Parameters: One parameter is required for this method.

locale: the locale in which to supply the display name.

Returns: the human-readable name of this time zone in the given locale.

Throws:

NullPointerException - if the locale is null.

Approach 1: When no exception

Java

import java.util.Locale;
import java.util.SimpleTimeZone;
import java.util.TimeZone;

public class TimeZonegetDisplayName2 {
    public static void main(String[] args) {

        TimeZone timeZone = new SimpleTimeZone(100, "US");

        Locale locale = Locale.US;

        System.out.println(timeZone.getDisplayName(locale));
    }
}

Output:

GMT+00:00

Approach 2: NullPointerException

Java

import java.util.Locale;
import java.util.SimpleTimeZone;
import java.util.TimeZone;

public class TimeZonegetDisplayName2 {
    public static void main(String[] args) {

        TimeZone timeZone = new SimpleTimeZone(100, "US");

        Locale locale = null;

        System.out.println(timeZone.getDisplayName(locale));
    }
}

Output:

Exception in thread "main" java.lang.NullPointerException
	at java.base/sun.util.locale.provider.LocaleServiceProviderPool.getLocalizedObjectImpl(LocaleServiceProviderPool.java:266)
	at java.base/sun.util.locale.provider.LocaleServiceProviderPool.getLocalizedObject(LocaleServiceProviderPool.java:236)
	at java.base/sun.util.locale.provider.TimeZoneNameUtility.retrieveDisplayNamesImpl(TimeZoneNameUtility.java:197)
	at java.base/sun.util.locale.provider.TimeZoneNameUtility.retrieveDisplayName(TimeZoneNameUtility.java:150)
	at java.base/java.util.TimeZone.getDisplayName(TimeZone.java:402)
	at java.base/java.util.TimeZone.getDisplayName(TimeZone.java:337)