java Java 中的 OffsetDateTime getLong()方法，带示例

Java 中的 OffsetDateTime getLong()方法，带示例

原文:https://www . geesforgeks . org/offsetdatetime-getlong-method-in-Java-with-examples/

Java 中 OffsetDateTime 类的 getLong() 方法从这个日期时间中获取指定字段的值作为一个 Long。

语法:

public long getLong(TemporalField field)

参数:该方法接受单个参数字段，指定要获取的字段，不为空。

返回值:返回该字段的值。

异常:该函数抛出三个异常，描述如下:

[Date and Time Exception] : If the value of this field cannot be obtained or the value is beyond the valid range of this field, the exception will be thrown.
Unsupported Temporaltypeexception : If the field is not supported or the value range exceeds a long integer, it will be thrown.
Arithmetic exception : thrown when numerical value overflows.

以下程序说明了 getLong() 方法:

程序 1 :

// Java program to demonstrate the getLong() method
import java.time.OffsetDateTime;
import java.time.temporal.ChronoField;

public class GFG {
    public static void main(String[] args)
    {

        // parses a date
        OffsetDateTime date = OffsetDateTime.parse("2018-12-03T12:30:30+01:00");

        // Prints the value of the specified
        // field from this date-time as an long.
        System.out.println(date.getLong(ChronoField.CLOCK_HOUR_OF_DAY));
    }
}

输出:

程序二 :

// Java program to demonstrate the getDayOfYear() method
// exceptions

import java.time.OffsetDateTime;
import java.time.temporal.ChronoField;

public class GFG {
    public static void main(String[] args)
    {
        try {
            // parses a date
            OffsetDateTime date = OffsetDateTime.parse("2018-24-03T12:30:30+01:00");

            // Prints the value of the specified
            // field from this date-time as an long.
            System.out.println(date.getLong(ChronoField.CLOCK_HOUR_OF_DAY));
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出:

java.time.format.DateTimeParseException: 
Text '2018-24-03T12:30:30+01:00' could not be parsed: 
Invalid value for MonthOfYear (valid values 1 - 12): 24