Java 8 –期間と期間の例
Java 8Duration、Period、およびChronoUnitオブジェクトを使用して、日付の違いを見つける方法を示すいくつかの例。
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期間-秒とナノ秒で時間を測定します。
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期間-年、月、日で時間を測定します。
1. 期間の例
2つのLocalDateTime間の秒差を見つけるためのjava.time.Durationの例
DurationExample.java
package com.example.time;
import java.time.Duration;
import java.time.LocalDateTime;
import java.time.Month;
import java.time.temporal.ChronoUnit;
public class DurationExample {
public static void main(String[] args) {
// Creating Durations
System.out.println("--- Examples --- ");
Duration oneHours = Duration.ofHours(1);
System.out.println(oneHours.getSeconds() + " seconds");
Duration oneHours2 = Duration.of(1, ChronoUnit.HOURS);
System.out.println(oneHours2.getSeconds() + " seconds");
// Test Duration.between
System.out.println("\n--- Duration.between --- ");
LocalDateTime oldDate = LocalDateTime.of(2016, Month.AUGUST, 31, 10, 20, 55);
LocalDateTime newDate = LocalDateTime.of(2016, Month.NOVEMBER, 9, 10, 21, 56);
System.out.println(oldDate);
System.out.println(newDate);
//count seconds between dates
Duration duration = Duration.between(oldDate, newDate);
System.out.println(duration.getSeconds() + " seconds");
}
}
出力
--- Examples --- 3600 seconds 3600 seconds --- Duration.between --- 2016-08-31T10:20:55 2016-11-09T10:21:56 6048061 seconds
2. 期間の例
2つのLocalDatesの間で異なる方法（年、月、日）を見つけるためのjava.time.Periodの例
PeriodExample.java
package com.example.time;
import java.time.LocalDate;
import java.time.Month;
import java.time.Period;
public class PeriodExample {
public static void main(String[] args) {
System.out.println("--- Examples --- ");
Period tenDays = Period.ofDays(10);
System.out.println(tenDays.getDays()); //10
Period oneYearTwoMonthsThreeDays = Period.of(1, 2, 3);
System.out.println(oneYearTwoMonthsThreeDays.getYears()); //1
System.out.println(oneYearTwoMonthsThreeDays.getMonths()); //2
System.out.println(oneYearTwoMonthsThreeDays.getDays()); //3
System.out.println("\n--- Period.between --- ");
LocalDate oldDate = LocalDate.of(1982, Month.AUGUST, 31);
LocalDate newDate = LocalDate.of(2016, Month.NOVEMBER, 9);
System.out.println(oldDate);
System.out.println(newDate);
// check period between dates
Period period = Period.between(oldDate, newDate);
System.out.print(period.getYears() + " years,");
System.out.print(period.getMonths() + " months,");
System.out.print(period.getDays() + " days");
}
}
出力
--- Examples --- 10 1 2 3 --- Period.between --- 1982-08-31 2016-11-09 34 years,2 months,9 days
3. ChronoUnitの例
または、ChronoUnit.{unit}.betweenを使用して日付の違いを確認し、次の例を確認することもできます。
ChronoUnitExample.java
package com.example.time;
import java.time.LocalDateTime;
import java.time.Month;
import java.time.temporal.ChronoUnit;
public class ChronoUnitExample {
public static void main(String[] args) {
LocalDateTime oldDate = LocalDateTime.of(1982, Month.AUGUST, 31, 10, 20, 55);
LocalDateTime newDate = LocalDateTime.of(2016, Month.NOVEMBER, 9, 10, 21, 56);
System.out.println(oldDate);
System.out.println(newDate);
// count between dates
long years = ChronoUnit.YEARS.between(oldDate, newDate);
long months = ChronoUnit.MONTHS.between(oldDate, newDate);
long weeks = ChronoUnit.WEEKS.between(oldDate, newDate);
long days = ChronoUnit.DAYS.between(oldDate, newDate);
long hours = ChronoUnit.HOURS.between(oldDate, newDate);
long minutes = ChronoUnit.MINUTES.between(oldDate, newDate);
long seconds = ChronoUnit.SECONDS.between(oldDate, newDate);
long milis = ChronoUnit.MILLIS.between(oldDate, newDate);
long nano = ChronoUnit.NANOS.between(oldDate, newDate);
System.out.println("\n--- Total --- ");
System.out.println(years + " years");
System.out.println(months + " months");
System.out.println(weeks + " weeks");
System.out.println(days + " days");
System.out.println(hours + " hours");
System.out.println(minutes + " minutes");
System.out.println(seconds + " seconds");
System.out.println(milis + " milis");
System.out.println(nano + " nano");
}
}
出力
1982-08-31T10:20:55 2016-11-09T10:21:56 --- Total --- 34 years 410 months 1784 weeks 12489 days 299736 hours 17984161 minutes 1079049661 seconds 1079049661000 milis 1079049661000000000 nano