Java 8 Time API Example: DayOfWeek, Duration and Instant
September 05, 2014
DayOfWeek in Java 8
java.time.DayOfWeek is an immutable and thread-safe enum in java 8. DayOfWeek represents the day of the week like MONDAY, TUESDAY etc. DayOfWeek day has a numeric value too. We can get day name by numeric value and can get numeric value by DAY also.DayOfWeekDemo.java
package com.cp.time;
import java.time.DayOfWeek;
public class DayOfWeekDemo {
public static void main(String[] args) {
System.out.print(DayOfWeek.MONDAY.getValue());
System.out.println(DayOfWeek.of(1));
System.out.print(DayOfWeek.THURSDAY.getValue());
System.out.println(DayOfWeek.of(2));
System.out.print(DayOfWeek.SUNDAY.getValue());
System.out.println(DayOfWeek.of(7));
}
}
Find the output.
1MONDAY 4TUESDAY 7SUNDAY
Duration in Java 8
java.time.Duration is an amount of time. For example 20 minute is an amount of time that can be represented by Duration class.DurationDemo.java
package com.cp.time;
import java.time.Duration;
import java.time.temporal.ChronoUnit;
public class DurationDemo {
public static void main(String[] args) {
Duration duration = Duration.of(2, ChronoUnit.DAYS);
System.out.println(duration.getSeconds());
System.out.println(Duration.ofHours(1).getSeconds());
System.out.println(Duration.ofDays(1).getSeconds());
}
}
Find the output.
172800 3600 86400
Instant in Java 8
java.time.Instant is same as its name. Instant can be used to record event time stamp in any application. Instant object represents instantaneous point on a time scale.InstantDemo.java
package com.cp.time;
import java.time.Clock;
import java.time.Instant;
public class InstantDemo {
public static void main(String[] args) {
Instant inst1 = Instant.now();
System.out.println(inst1.getEpochSecond());
Instant inst2 = Instant.EPOCH;
System.out.println(inst1.isAfter(inst2));
Instant inst3 = Instant.now(Clock.systemUTC());
System.out.println(inst3.isAfter(inst1));
System.out.println(Instant.MAX.getNano());
System.out.println(Instant.MIN.getNano());
}
}
Find the output.
1409913547 true false 999999999 0
