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import ch09.Employee;
import ch09.IoUtils;
import ch09.Point;
import ch09.PointDisk;
import ch12.TimeInterval;
import org.junit.Test;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.time.*;
import java.time.temporal.*;
import java.util.*;
import java.util.function.Predicate;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class Chapter12 {
@Test
public void ex01() {
// 개발자의 날 : 매년 256번째 날 (9월 13일이지만 윤년에는 9월 12일)
int year = 2000;
for (; year <= LocalDate.now().getYear(); year++) {
LocalDate programmersDay = LocalDate.of(year, 1, 1).plus(Period.ofDays(255));
System.out.println(programmersDay);
}
}
@Test
public void ex02() {
// 2000 : 윤년
// 2001
// 2002
// 2003
// 2004 : 윤년
LocalDate date = LocalDate.of(2000, 2, 29);
System.out.println(date); // 2000-02-29
System.out.println(date.plusYears(1)); // 2001-02-28
System.out.println(date.plusYears(4)); // 2004-02-29
for (int i = 1; i <= 4; i++) {
date = date.plusYears(1);
System.out.println(i + " = " + date);
}
// 1 = 2001-02-28
// 2 = 2002-02-28
// 3 = 2003-02-28
// 4 = 2004-02-28
}
@Test
public void ex03() {
LocalDate today = LocalDate.now();
System.out.println("today = " + today);
LocalDate next = today.with(next(w -> w.getDayOfWeek().getValue() < 6));
System.out.println("next = " + next);
}
public static TemporalAdjuster next(Predicate<LocalDate> predicate) {
return (temporal) -> {
LocalDate d = (LocalDate) temporal;
do {
d = d.plusDays(1);
} while (!predicate.test(d));
return d;
};
}
@Test
public void ex04() {
int year = 2013;
int month = 3;
LocalDate date = LocalDate.of(year, month, 1);
LocalDate last = date.with(TemporalAdjusters.lastDayOfMonth());
// 빈 공백 찍기
for (int i = 1; i < date.getDayOfWeek().getValue(); i++) {
System.out.printf(" ");
}
for (; !date.isAfter(last); date = date.plusDays(1)) {
System.out.printf("%2d ", date.getDayOfMonth());
if (date.getDayOfWeek() == DayOfWeek.SUNDAY) {
System.out.println();
}
}
}
@Test
public void ex05() {
LocalDate birthday = LocalDate.of(1983, 11, 12);
LocalDate today = LocalDate.now();
long days = ChronoUnit.DAYS.between(birthday, today);
System.out.println("days = " + days);
}
@Test
public void ex06() {
LocalDate start = LocalDate.of(1901, 1, 1);
LocalDate end = LocalDate.of(2000, 12, 31);
LocalDate d = start.with(TemporalAdjusters.nextOrSame(DayOfWeek.FRIDAY));
do {
if (d.getDayOfMonth() == 13) {
System.out.println(d);
}
d = d.with(TemporalAdjusters.next(DayOfWeek.FRIDAY));
} while (!d.isAfter(end));
}
@Test
public void ex07() {
TimeInterval ti1 = new TimeInterval(LocalTime.of(10, 00), LocalTime.of(11, 00));
TimeInterval ti2 = new TimeInterval(LocalTime.of(10, 30), LocalTime.of(12, 00));
System.out.println(ti1.isOverlap(ti2));
}
@Test
public void ex08() {
ZonedDateTime today = ZonedDateTime.now();
Instant instant = today.toInstant();
System.out.println(today);
System.out.println();
ZoneId.getAvailableZoneIds().stream().forEach(zoneId -> {
ZonedDateTime zoned = instant.atZone(ZoneId.of(zoneId));
System.out.printf("%-40s = %s\n", zoneId, zoned.getOffset());
});
}
@Test
public void ex09() {
Instant instant = Instant.now();
ZoneId.getAvailableZoneIds().stream()
.map(t -> ZoneId.of(t))
.filter(t -> t.getRules().getOffset(instant).getTotalSeconds() == 0)
.forEach(t -> System.out.println(t));
}
@Test
public void ex10() {
// 일광 절약시간을 사용하는 지역들이다.
// America/Los_Angeles (PST -> PDT) : https://www.timeanddate.com/time/zone/usa/los-angeles
// Frankfurt (CET -> CEST) : https://www.timeanddate.com/time/zone/germany/frankfurt
LocalDate date = LocalDate.of(2018, 3, 2);
// 출발
LocalTime time = LocalTime.of(15, 5, 00);
ZoneId zoneId = ZoneId.of("America/Los_Angeles");
ZonedDateTime departure = ZonedDateTime.of(date, time, zoneId);
// 도착
ZonedDateTime arrival = departure.plusHours(10).plusMinutes(50).toInstant().atZone(ZoneId.of("CET"));
System.out.println(departure);
System.out.println(arrival);
// 2018-03-02T15:05-08:00[America/Los_Angeles] -> 2018-03-03T10:55+01:00[CET]
}
@Test
public void ex11() {
ZonedDateTime departure = ZonedDateTime.of(2018, 1, 22, 14, 5, 0, 0, ZoneId.of("CET"));
ZonedDateTime arrival = ZonedDateTime.of(2018, 1, 22, 16, 40, 0, 0, ZoneId.of("America/Los_Angeles"));
Duration between = Duration.between(departure, arrival);
System.out.println(between);
}
@Test
public void ex12() {
ZonedDateTime kst = ZonedDateTime.of(2018, 5, 1, 16, 0, 0, 0, ZoneId.of("Asia/Seoul"));
ZonedDateTime utc = kst.toInstant().atZone(ZoneId.of("UTC"));
ZonedDateTime pst = utc.toInstant().atZone(ZoneId.of("America/Los_Angeles"));
System.out.println("KST = " + kst);
System.out.println("UTC = " + utc);
System.out.println("PST = " + pst);
}
@Test
public void ex() {
int year = 2000;
for (; year <= LocalDate.now().getYear(); year++) {
LocalDate start = LocalDate.of(year, 1, 1);
LocalDate end = LocalDate.of(year, 12, 31);
int c = 0;
while (start.isBefore(end)) {
start = start.plusDays(1);
c++;
}
System.out.println(year + " = " + c);
// 2000 = 365
// 2001 = 364
// 2002 = 364
// 2003 = 364
// 2004 = 365
// 2005 = 364
// 2006 = 364
// 2007 = 364
// 2008 = 365
// 2009 = 364
// 2010 = 364
// 2011 = 364
// 2012 = 365
// 2013 = 364
// 2014 = 364
// 2015 = 364
// 2016 = 365
// 2017 = 364
// 2018 = 364
}
}
}