As such a clock can be used instead of system currenttimemillis and timezone getdefault.
Wall clock time java.
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.
The java time clock class provides access to the current instant date and time using a time zone.
This class does not store or represent a date or time zone.
This method can use system currenttimemillis or other higher resolution clock if the clock is available to use.
Java time clock tickminutes zoneid zone method is a static method of clock class that returns the current instant ticking in whole minutes using the best available system clock and the time zone of that instant is same as the time zone passed as a parameter.
Use of a clock is.
Wall clock time may change for many reasons e g.
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.
Time is represented to nanosecond precision.
Localtime is an immutable date time object that represents a time often viewed as hour minute second.
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.
Time elapsed is the difference between these two values.
For example the value 13 45 30 123456789 can be stored in a localtime.
Following is the declaration for java io clock class.
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.
A time without a time zone in the iso 8601 calendar system such as 10 15 30.
Nanosecond and second fields of the clock are set to zero to round the instant in the whole minute.
A clock providing access to the current instant date and time using a time zone.
Ideally currenttimemillis should be used to measure wall clock time and nanotime should be used to measure the elapsed.
Public abstract class clock extends object class constructors.
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.