Java中的 IsoChronology eraOf() 方法与示例

Java.time.chrono.IsoChronology类的eraOf()方法用于使用数值 0 和 1 检索 Iso Era，因为 IsoChronology 仅包含两个 HijrahEra。句法：

public IsoEra eraOf(int eraValue)

参数：此方法将eraValue整数作为要为其生成 IsoEra 的参数。返回值：此方法使用数值 0 和 1 返回Iso Era ，因为 IsoChronology 仅包含两个 HijrahEra 。下面是说明eraOf()方法的示例：示例 1：

Java

// Java program to demonstrate
// eraOf() 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();
 
            // getting IsoEra for the
            // given integer value
            // by using eraOf() method
            IsoEra era = crono.eraOf(0);
 
            // display the result
            System.out.println("IsoEra is: "
                               + era);
        }
        catch (DateTimeException e) {
            System.out.println("HijrahEra is invalid");
            System.out.println("Exception thrown: " + e);
        }
    }
}

输出：

IsoEra is: BCE

示例 2：

Java

// Java program to demonstrate
// eraOf() 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();
 
            // getting IsoEra for the
            // given integer value
            // by using eraOf() method
            IsoEra era = crono.eraOf(1);
 
            // display the result
            System.out.println("IsoEra is: "
                               + era);
        }
        catch (DateTimeException e) {
            System.out.println("HijrahEra is invalid");
            System.out.println("Exception thrown: " + e);
        }
    }
}

输出：

IsoEra is: CE

参考： https://docs.oracle.com/javase/9/docs/api/ Java/time/chrono/IsoChronology.html#eraOf-int-