Instances of this class are used to find the current instant which can be interpreted using the stored time zone to find the current date and time.
Wall clock time java.
Following is the declaration for java io clock class.
Use of a clock is.
This class does not store or represent a date or time zone.
The current date and time depend on the time zone and for globalized applications a time provider is necessary to ensure that the date and time are created with the correct time zone.
Public abstract class clock extends object class constructors.
Wall clock time may change for many reasons e g.
A time without a time zone in the iso 8601 calendar system such as 10 15 30.
Time is represented to nanosecond precision.
Java time clock system zoneid zone method is a static method of clock class which returns a clock that returns the current instant of the clock using best available system clock with zoneid of the returned clock is set to the zoneid passed.
Ideally currenttimemillis should be used to measure wall clock time and nanotime should be used to measure the elapsed.
Clock was added in java 8 and provides access to an instant in time using the best available system clock and to be used as a time provider which can be effectively stubbed for testing purposes.
For example the value 13 45 30 123456789 can be stored in a localtime.
Java system class also provides the static method currenttimemillis that returns the difference between the current time and midnight january 1 1970 utc in milliseconds.
The java time clock class provides access to the current instant date and time using a time zone.
A clock providing access to the current instant date and time using a time zone.
As such a clock can be used instead of system currenttimemillis and timezone getdefault.
Localtime is an immutable date time object that represents a time often viewed as hour minute second.
Time elapsed is the difference between these two values.
The clock class was added in java 8 and provides access to an instant in time using the best available system clock and to be used as a time provider which can be effectively stubbed for testing purposes.
This method can use system currenttimemillis or other higher resolution clock if the clock is available to use.
Changing the system time can affect the results or a leap second will disrupt the result.