Java中的 IsoChronology date(TemporalAccessor) 方法与示例

Java.time.chrono.IsoChronology类的date()方法用于根据 ISO 系统从另一个 TemporalAccessor 对象获取本地日期。

句法：

public LocalDate date(TemporalAccessor temporal)

参数：此方法将任何时间访问器的对象作为参数。

返回值：该方法根据 Iso 日历系统从另一个 TemporalAccessor 对象返回本地日期。

以下是说明date()方法的示例：

示例 1：

// Java program to demonstrate
// date() method
  
import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;
  
public class GFG {
    public static void main(String[] argv)
    {
        try {
            // creating and initializing  LocalDate Object
            LocalDate hidate = LocalDate.now();
  
            // getting IsoChronology used in LocalDate
            IsoChronology crono = hidate.getChronology();
  
            // creating and initializing
            // TemporalAccessor object
            ZonedDateTime zonedate
                = ZonedDateTime.parse(
                    "2018-10-25T23:12:31."
                    + "123+02:00[Europe/Paris]");
  
            // getting HijrahDate for the
            // given TemporalAccessor object
            // by using date() method
            LocalDate date = crono.date(zonedate);
  
            // display the result
            System.out.println("LocalDate is: " + date);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can"
                               + " not form a date");
            System.out.println("Exception thrown: " + e);
        }
    }
}

输出：

LocalDate is: 2018-10-25

示例 2：

// Java program to demonstrate
// date() method
  
import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;
  
public class GFG {
    public static void main(String[] argv)
    {
        try {
            // creating and initializing  LocalDate Object
            LocalDate hidate = LocalDate.now();
  
            // getting IsoChronology used in LocalDate
            IsoChronology crono = hidate.getChronology();
  
            // creating and initializing TemporalAccessor object
            LocalDateTime localdate
                = LocalDateTime
                      .parse("2018-12-30T19:34:50.63");
  
            // getting HijrahDate for the
            // given TemporalAccessor object
            // by using date() method
            LocalDate date = crono.date(localdate);
  
            // display the result
            System.out.println("LocalDate is: " + date);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can"
                               + " not form a date");
            System.out.println("Exception thrown: " + e);
        }
    }
}

输出：

LocalDate is: 2018-12-30

参考： https://docs.oracle.com/javase/9/docs/api/ Java/time/chrono/IsoChronology.html#date-java.time.temporal.TemporalAccessor-