Java中的 IsoChronology range() 方法与示例

Java.time.chrono.IsoChronology 类的 range() 方法用于从 ChronoField 类型的指定字段中获取范围。

句法：

public ValueRange range(ChronoField field)

参数：该方法将 ChronoField 类型的字段作为参数。

返回值：此方法返回时间类型的指定字段的范围。

以下是说明range()方法的示例：

示例 1：

// Java program to demonstrate
// range() method
  
import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;
import java.time.temporal.*;
  
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();
  
            // getting the ValueRange for
            // given ChronoField
            // by using range() method
            ValueRange range
                = crono.range(
                    ChronoField.ERA);
  
            // display the result
            System.out.println(
                "Equivalent Range : "
                + range);
        }
        catch (DateTimeException e) {
            System.out.println(
                "passed parameter can"
                + " not form a date");
            System.out.println(
                "Exception thrown: " + e);
        }
    }
}

输出：

Equivalent Range : 0 - 1

示例 2：

// Java program to demonstrate
// range() method
  
import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;
import java.time.temporal.*;
  
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();
  
            // getting the ValueRange for
            // given ChronoField
            // by using range() method
            ValueRange range
                = crono.range(
                    ChronoField.YEAR);
  
            // display the result
            System.out.println(
                "Equivalent Range : "
                + range);
        }
        catch (DateTimeException e) {
            System.out.println(
                "passed parameter can"
                + " not form a date");
            System.out.println(
                "Exception thrown: " + e);
        }
    }
}

输出：

Equivalent Range : -999999999 - 999999999

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