Java中的 LocalDate withDayOfYear() 方法及示例
Java中LocalDate 类的withDayOfYear()方法返回此 LocalDate 的副本,其中更改了年份。
句法:
public LocalDate withDayOfYear(int dayOfYear)
参数:此方法接受一个强制参数dayOfYear ,该参数指定要在结果中设置的年份,从 1 到 365-366。
返回:该函数返回一个基于此日期的 LocalDate 和请求的日期,而不是 null。
异常:当年份值无效时,该函数会引发DateTimeException 。
下面的程序说明了LocalDate.withDayOfYear()方法:
方案一:
// Program to illustrate the withDayOfYear() method
import java.util.*;
import java.time.*;
public class GfG {
public static void main(String[] args)
{
// Parses the date
LocalDate dt1 = LocalDate.parse("2018-12-07");
LocalDate result = dt1.withDayOfYear(01);
// Prints the date with year
System.out.println("The date with day of year is: " + result);
}
}
输出:
The date with day of year is: 2018-01-01
方案二:
// Program to illustrate the withDayOfYear() method
// Exceptions
import java.util.*;
import java.time.*;
import java.time.temporal.ChronoField;
public class GfG {
public static void main(String[] args)
{
try {
// Parses the date
LocalDate dt1 = LocalDate.parse("2018-12-07");
LocalDate result = dt1.withDayOfYear(370);
// Prints the date with year
System.out.println("The date with month is: " + result);
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
java.time.DateTimeException: Invalid value for DayOfYear (valid values 1 - 365/366): 370
参考: https: Java/time/LocalDate.html#withDayOfYear(int)