How to convert nanoseconds to seconds using the TimeUnit enum

Question

How to convert a value from nanoseconds to seconds     Here s the code segment    import java io    import java util concurrent         class Stamper     public static void main  String   args     long start   System nanoTime       some try with nested loops  long end   System nanoTime     long elapsedTime   end - start   System out println  elapsed      elapsedTime    nano seconds n       convert to seconds  TimeUnit seconds   new TimeUnit     System out println  which is     seconds toSeconds elapsedTime      seconds          The error is   Stamper java 16   enum types may not be instantiated    What does this mean

User · Answer

TimeUnit Enum  The following expression uses the TimeUnit enum  Java 5 and later  to convert from nanoseconds to seconds   TimeUnit SECONDS convert elapsedTime  TimeUnit NANOSECONDS

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You should write        long startTime   System nanoTime                long estimatedTime   System nanoTime   - startTime    Assigning the endTime in a variable might cause a few nanoseconds  In this approach you will get the exact elapsed time    And then   TimeUnit SECONDS convert estimatedTime  TimeUnit NANOSECONDS

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JDK9  solution using java time Duration  Duration ofNanos 1 000 000L  toSeconds     https   docs oracle com javase 9 docs api java time Duration html ofNanos-long-  https   docs oracle com javase 9 docs api java time Duration html toSeconds--

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This will convert a time to seconds in a double format  which is more precise than an integer value   double elapsedTimeInSeconds   TimeUnit MILLISECONDS convert elapsedTime  TimeUnit NANOSECONDS    1000 0

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To reduce verbosity  you can use a static import   import static java util concurrent TimeUnit NANOSECONDS    -and henceforth just type  NANOSECONDS toSeconds elapsedTime

User · Answer

Well  you could just divide by 1 000 000 000   long elapsedTime   end - start  double seconds    double elapsedTime   1 000 000 000 0    If you use TimeUnit to convert  you ll get your result as a long  so you ll lose decimal precision but maintain whole number precision

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TimeUnit is an enum  so you can t create a new one   The following will convert 1000000000000ns to seconds   TimeUnit NANOSECONDS toSeconds 1000000000000L

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In Java 8 or Kotlin  I use Duration ofNanos 1 000 000 000  like val duration   Duration ofNanos 1 000 000 000  logger info String format  quot  d  02dm  02ds  03d quot                   elapse  duration toMinutes    duration toSeconds    duration toMillis      Read more https   docs oracle com javase 8 docs api java time Duration html

[java] How to convert nanoseconds to seconds using the TimeUnit enum?

`TimeUnit` Enum

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