java.time.Duration - Time Durations
This section describes the java.time.Duration class that represents a duration of time measured in seconds with fractions in nanosecond resolution.
When manipulating moments of time, we have to handle time durations that measure amounts of time passed between given moments.
The java.time.Duration class in the Date-Time API is designed to help us do this.
It represents a duration between two given moments of time.
A duration of time is actually represented by a java.time.Duration object with 2 components:
- Seconds - Representing the number of whole seconds in this duration.
- Nanoseconds-of-Second - Representing the fraction part of a second in this duration.
The java.time.Duration class does not respect any calendar rules or timezone rules.
Main methods offered on the java.time.Duration class are:
- ofSeconds() - A static method returning a Duration object representing the duration of time
constructed with the given number of seconds and the given number of nanoseconds.
Note that there are no constructors in Duration class. So "new Duration()" is not a valid expression.
- getSeconds() - An object method returning the second value of this Duration object.
- getNano() - An object method returning the Nanosecond-of-Second value of this Duration object.
- get() - An object method returning the value of a given temporal field,
SECONDS or NANOS from this Duration object.
- toString() - An object method returning a string representing this Duration object in ISO 8601 duration format
with the second value normalized into hours, minutes and seconds.
Here is an example of toString() output, "PT8H6M12.345S".
- plus() - An object method returns a copy of this Duration object with a duration expressed
Duration object, or units of DAYS, HOURS, MINUTES, SECONDS, MILLIS, MICROS, NONOS etc. added.
Note that the plus() cannot be used to construct duration by adding duration in YEARS or MONTHS.
- minus() - An object method returns a copy of this Duration object with a duration expressed
Duration object, or units of DAYS, HOURS, MINUTES, SECONDS, MILLIS, MICROS, NONOS etc. removed.
Note that the minus() cannot be used to construct duration by adding duration in YEARS or MONTHS.
- parse() - A static method returning a Duration object representing a duration of time constructed by
parsing the given character sequence using the ISO 8601 duration format of "PnDTnHnMn.nS".
- between() - A static method returning a Duration object representing the duration of time
between two given moments in time.
- addTo() - An object method returning a date-time object representing the moment of time
constructed by adding this duration to a given moment of time.
- subtractFrom() - An object method returning a date-time object representing the moment of time
constructed by subtracting this duration from a given moment of time.
Table of Contents
About This JDK Tutorial Book
JDK (Java Development Kit)
►Java Date-Time API
What Is Date-Time API
java.time.Instant - Representing a Moment of Time
java.time.Instant Usage Examples
java.time.Instant - get(INSTANT_SECONDS) Error
Converting java.util.Date to java.time.Instant
java.time.ZonedDateTime - Calendar and Timezone
java.time.ZonedDateTime Usage Examples
Converting java.util.GregorianCalendar to java.time.ZonedDateTime
java.time.OffsetDateTime - Calendar and UTC Offset
java.time.OffsetDateTime Usage Examples
java.time.LocalDateTime - Local Date and time without Timezone
Partial Date and Time Objects and Classes
java.time.format.DateTimeFormatter - Date-Time Strings
►java.time.Duration - Time Durations
java.time.Duration Usage Examples
java.time.Period - Periods in Days and Months
java.time.Period Usage Examples
Date, Time and Calendar Classes
Date and Time Object and String Conversion
Number Object and Numeric String Conversion
Locales, Localization Methods and Resource Bundles
Calling and Importing Classes Defined in Unnamed Packages
HashSet, Vector, HashMap and Collection Classes
Character Set Encoding Classes and Methods
Character Set Encoding Maps
Encoding Conversion Programs for Encoded Text Files
Socket Network Communication
Datagram Network Communication
DOM (Document Object Model) - API for XML Files
SAX (Simple API for XML)
DTD (Document Type Definition) - XML Validation
XSD (XML Schema Definition) - XML Validation
XSL (Extensible Stylesheet Language)
Message Digest Algorithm Implementations in JDK
Private key and Public Key Pair Generation
PKCS#8/X.509 Private/Public Encoding Standards
Digital Signature Algorithm and Sample Program
"keytool" Commands and "keystore" Files
KeyStore and Certificate Classes
Secret Key Generation and Management
Cipher - Encryption and Decryption
The SSL (Secure Socket Layer) Protocol
SSL Socket Communication Testing Programs
SSL Client Authentication
HTTPS (Hypertext Transfer Protocol Secure)
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