Convert Nanoseconds into Seconds

[ranua agarwal]

Hi,

I am using this piece of code to change nanosecond to second--

 System.out.println(TimeUnit.SECONDS.convert(1562500003, TimeUnit.NANOSECONDS));   

By using this i am unable to hold with precision.
Output of above program is : 1
While i want in this way : 1.56250003

Can somebody point how to achieve this?

Thanks,
Ranu.

[Ernest Friedman-Hill]

The TimeUnit.convert() method(s) deal only in long integers; they can't represent fractions of a unit. Instead of using TimeUnit.convert(), you can just divide by 10^9 -- ie.,

System.out.println(1562500003 / 1E9);

gives the "right" answer.

[ranua agarwal]

Thank You Ernest.
I did it with

 Long l = new Long(1562500003);
          System.out.println(l.doubleValue()/1000000000);   

[Jesper de Jong]

ranua agarwal wrote:

 Long l = new Long(1562500003);
          System.out.println(l.doubleValue()/1000000000);   

Ok, that works, but why use the Long wrapper class, why not just use a primtive long directly? You just have to cast it properly to make sure you get a floating-point division, instead of an integer division.

long nanoSeconds = 1562500003L;
double seconds = ((double) nanoSeconds) / 1000000000;

[Rob Spoor]

Or turn the other operand into a double:

long nanoSeconds = 1562500003L;
double seconds = nanoSeconds / 1000000000.0;

The added .0 turns the constant into a double, and the result of the division will be a double if at least one of the operands is a double. Of course, 1000000000.0 is the same as 1E9 which Ernest already suggested.