Java Data Type How to - Convert java.util.concurrent.TimeUnit to java.time.temporal.ChronoUnit and back

• Back to Date Convert  ↑

Question

We would like to know how to convert java.util.concurrent.TimeUnit to java.time.temporal.ChronoUnit and back.

Answer

import java.time.temporal.ChronoUnit;
import java.util.concurrent.TimeUnit;
//from ww  w .j  av  a  2  s . c o m
public class Main {

  public static void main(String[] args) {
    System.out.println(convert(ChronoUnit.DAYS));
  }


  public static TimeUnit convert(ChronoUnit tu) {
      if (tu == null) {
          return null;
      }
      switch (tu) {
          case DAYS:
              return TimeUnit.DAYS;
          case HOURS:
              return TimeUnit.HOURS;
          case MINUTES:
              return TimeUnit.MINUTES;
          case SECONDS:
              return TimeUnit.SECONDS;
          case MICROS:
              return TimeUnit.MICROSECONDS;
          case MILLIS:
              return TimeUnit.MILLISECONDS;
          case NANOS:
              return TimeUnit.NANOSECONDS;
          default:
              //TODO support the rest
              throw new UnsupportedOperationException("Man, use a real temporal unit");
      }
  }

  public static ChronoUnit convert(TimeUnit tu) {
      if (tu == null) {
          return null;
      }
      switch (tu) {
          case DAYS:
              return ChronoUnit.DAYS;
          case HOURS:
              return ChronoUnit.HOURS;
          case MINUTES:
              return ChronoUnit.MINUTES;
          case SECONDS:
              return ChronoUnit.SECONDS;
          case MICROSECONDS:
              return ChronoUnit.MICROS;
          case MILLISECONDS:
              return ChronoUnit.MILLIS;
          case NANOSECONDS:
              return ChronoUnit.NANOS;
          default:
              assert false : "there are no other TimeUnit ordinal values";
              return null;
      }
  }
}

The code above generates the following result.

• Back to Date Convert  ↑