Singleton are effectively final

Singleton classes, if properly implemented, do not need to be declared final in order to not be extended. Since all the constructors of the singleton class are private, you can't extend that class. In fact, singleton classes are effectively final.

stackoverflow

DayLight change in Italy

http://www.uniquevisitor.it/magazine/ora-legale-italia.php

	package org.enricogiurin.ocpjp.ch5;
	import java.time.*;
	/**
	* Created by enrico on 11/19/16.
	* ora legale
	*/
	public class DayLight {
	public static void main(String[] args) {
	DayLight dayLight = new DayLight();
	dayLight.oraLegaleInItalia();
	}
	public void oraLegaleInItalia() {
	//26/3/2017 - 02:00 - entra ora legale
	//29/10/2017 -03:00 - torna ora solare
	LocalDate localDate = LocalDate.of(2017, Month.MARCH, 26);
	LocalTime localTime = LocalTime.of(1, 30);
	ZoneId defaultZoneId = ZoneId.systemDefault(); //Europe/Rome
	ZonedDateTime zonedDateTime = ZonedDateTime.of(localDate, localTime, defaultZoneId);
	//it is 1.30 and the GMT +1
	System.out.println(zonedDateTime);
	zonedDateTime = zonedDateTime.plusHours(1);
	//it is 3.30 and the GMT +2
	System.out.println(zonedDateTime);
	//now let's go to october (torna ora solare)
	localDate = LocalDate.of(2017, Month.OCTOBER, 29);
	localTime = LocalTime.of(2, 30); //note the daylight starts at 3:00
	defaultZoneId = ZoneId.systemDefault(); //Europe/Rome
	zonedDateTime = ZonedDateTime.of(localDate, localTime, defaultZoneId);
	//it is 2.30 and the GMT +2
	System.out.println(zonedDateTime);
	zonedDateTime = zonedDateTime.plusHours(1);
	//it is 2.30 and the GMT +1
	System.out.println(zonedDateTime);
	}
	}

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