Java Programming Tutorials

Java programming tutorials with many code examples!

Java Time Clock systemDefaultZone

java.time.Clock.systemDefaultZone()

The method Clock.systemDefaultZone() returns a clock that will use the best available system clock to convert instant into date and time using default time-zone.

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Java Time Clock offset(Clock,Duration)

java.time.Clock.offset(Clock,Duration)

The method java.time.Clock.offset(Clock,Duration) returns a wrapper around given Clock with the specified Duration added. This clock implementation allows easily to jump into the past and future.

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Java Time ZoneId getAvailableZoneIds

java.time.ZoneId.getAvailableZoneIds()

The method ZoneId.getAvailableZoneIds() returns set of available zone IDs, including all available region-based IDs. Usually passed to of(String zoneId) to create ZoneId.

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Java Time Clock system(ZoneId)

java.time.Clock.system(ZoneId zone)

The method java.time.Clock.system(ZoneId zone) a clock that uses the best available system clock in the specified zone – never null.

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Java time Clock fixed

java.time.Clock.fixed()

The method java.time.Clock.fixed() returns a clock that always returns the same time. This type of clock is mainly useful in testing.

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MongoDB performance tuning tips

MongoDB performance tuning tips

This tutorial is a collection of performance tuning tips for Java developers that would like to improve performance of their Java apps on top of MongoDB.

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Java Util Currency Tutorial

The java.util.Currency class represents a currency. These are the main properties of the class:

  • Currencies are identified by their ISO 4217 currency codes
  • There is never more than one Currency instance for any given currency
  • Get instance of the class using getInstance() methods
  • the class is final and cannot be inherited.

The class declaration is:

public final class Currency
       extends Object
       implements Serializable

Methods inheritance

Objects of this class inherit methods from the following classes:

  • java.lang.Object

Methods of java.util.Currency:

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Java Util Currency toString

java.util.Currency.toString()

The method java.util.Currency.toString() overrides Object.toString() and returns the ISO 4217 currency code of this currency.

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