This article is the series of Java Date Time API Tutorial. In this article, we will discuss important methods or APIs of the Java Year class from the java.time package.
The Year class is an immutable date-time object that represents a year. Any field that can be derived from a year can be obtained. This class is immutable and thread-safe.
The Year class is an immutable date-time object that represents a year. Any field that can be derived from a year can be obtained. This class is immutable and thread-safe.
Java Year Class Diagram
The below class diagram shows a list of methods that the Year class provides.
Java Year Class Methods/APIs with Examples
Let's demonstrates the usage of a few important and commonly used Year class methods with examples. In below YearMethodsExample class, each method name describes the Year class method and its usage. Please refer the comments on each method are self-descriptive.
package net.javaguides.date;
import java.time.Clock;
import java.time.LocalDate;
import java.time.Year;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoField;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalQueries;
/**
* Class demonstrates the usage of Year methods with examples
*
* @author Ramesh Fadatare
*
*/
public class YearMethodsExample {
public static void main(String[] args) {
YearMethodsExample example = new YearMethodsExample();
example.withMethodExample();
example.untilMethodExample();
example.toStringMethodExample();
example.rangeMethodExample();
example.queryMethodExample();
example.plusYearsMethodExample();
example.ofMethodExample();
example.nowMethod();
example.now();
example.nowMethodExample();
example.minusYearsMethodExample();
example.minusMethodExample();
example.isLeapMethodExample();
example.isBeforeMethodExample();
example.isAfterMethodExample();
example.getMethodExample();
example.fromMethodExample();
example.formatMethodExample();
example.atDayMethodExample();
}
/**
* Demonstration of Year.parse(CharSequence text)
*/
public void withMethodExample() {
Year date = Year.parse("2017");
Year result = date.with(Year.of(2010));
System.out.println(result);
}
/**
* Demonstration of Year.until(Temporal endExclusive, TemporalUnit unit)
*/
public void untilMethodExample() {
Year date = Year.parse("2015");
Year date1 = Year.now();
System.out.println(date.until(date1, ChronoUnit.YEARS));
}
/**
* Demonstration of Year.toString()
*/
public void toStringMethodExample() {
Year date = Year.parse("2017");
System.out.println(date.toString());
}
/**
* Demonstration of Year.range(TemporalField field)
*/
public void rangeMethodExample() {
Year date = Year.parse("2014");
System.out.println("Range : " + date.range(ChronoField.YEAR_OF_ERA));
}
/**
* Demonstration of Year.query(TemporalQuery<TemporalUnit> query)
*/
public void queryMethodExample() {
Year date = Year.parse("2014");
System.out.printf("Year precision is %s%n", date.query(TemporalQueries.precision()));
}
/**
* Demonstration of Year.plusYears(long yearsToAdd)
*/
public void plusYearsMethodExample() {
Year date = Year.parse("2017");
Year date1 = date.plusYears(10);
System.out.println(date1);
}
/**
* Demonstration of Year.of(int isoYear)
*/
public void ofMethodExample() {
Year year = Year.of(2017);
System.out.println(year);
}
/**
* Demonstration of Year.now(ZoneId zone)
*/
public void nowMethod() {
Year date = Year.now(ZoneId.systemDefault());
System.out.println(date);
}
/**
* Demonstration of Year.now(Clock clock)
*/
public void now() {
Year date = Year.now(Clock.systemUTC());
System.out.println(date);
}
/**
* Demonstration of Year.now()
*/
public void nowMethodExample() {
Year date = Year.now();
System.out.println(date);
}
/**
* Demonstration of Year.minusYears(long yearsToSubtract)
*/
public void minusYearsMethodExample() {
Year date = Year.of(2017);
System.out.println(date.get(ChronoField.YEAR));
System.out.println(date.minusYears(4).get(ChronoField.YEAR));
}
/**
* Demonstration of Year.minus(long amountToSubtract, TemporalUnit unit)
*/
public void minusMethodExample() {
Year date = Year.of(2017);
System.out.println(date.minus(2, ChronoUnit.YEARS));
}
/**
* Demonstration of Year.isLeap(long year)
*/
public void isLeapMethodExample() {
System.out.println(Year.isLeap(2016));
}
/**
* Demonstration of Year.isBefore(Year other)
*/
public void isBeforeMethodExample() {
Year date = Year.of(2016);
Year date1 = Year.of(2017);
System.out.println(date1.isBefore(date));
}
/**
* Demonstration of Year.isAfter(Year other)
*/
public void isAfterMethodExample() {
Year date = Year.of(2016);
Year date1 = Year.of(2017);
System.out.println(date1.isAfter(date));
}
/**
* Demonstration of Year.get(TemporalField field)
*/
public void getMethodExample() {
Year date = Year.of(2017);
System.out.println(date.get(ChronoField.YEAR_OF_ERA));
}
/**
* Demonstration of Year.from(TemporalAccessor temporal)
*/
public void fromMethodExample() {
Year date = Year.from(Year.of(2017));
System.out.println(date);
}
/**
* Demonstration of java.time.format.DateTimeFormatter.format(TemporalAccessor temporal)
*/
public void formatMethodExample() {
Year date = Year.of(2017);
System.out.println(date);
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yy");
System.out.println(formatter.format(date));
}
/**
* Demonstration of Year.atDay(int dayOfYear)
*/
public void atDayMethodExample() {
Year year = Year.of(2015);
LocalDate date = year.atDay(26);
System.out.println(date);
}
}
Output:
2010
3
2017
Range : 1 - 999999999
Year precision is Years
2027
2017
2018
2018
2018
2017
2013
2015
true
false
true
2017
2017
2017
17
2015-01-26Related Java 8 Date & Time API Guide
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