Java 中的 YearMonth getLong()方法，带示例

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

Java 中 YearMonth 类的 getLong() 方法用于从这个 year-month 中获取指定字段的值作为 Long 值。此方法查询今年-月指定字段的值。如果由于字段不受支持或其他原因而无法返回值，则会引发异常。

语法:

public long getLong(TemporalField field)

参数:该方法接受字段作为参数，该参数表示需要其值的临时字段。

返回值:该方法将字段的值作为长返回。

异常:此方法抛出以下异常:

  • [Date and Time Exception] –If the value of this field cannot be obtained or it is beyond the valid range of this field.
  • Unsupported Temporaltypeexception –If the field is unsupported or the range of values exceeds an integer.
  • Arithmetic exception -If there is a numerical overflow.

下面的程序说明了 Java 中 YearMonth 的 getLong()方法:

程序 1:

// Java program to demonstrate
// YearMonth.getLong() method

import java.time.*;
import java.time.temporal.*;

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

        // create YearMonth object
        YearMonth yearmonth
            = YearMonth.of(2019, 4);

        // apply getLong() method
        // of YearMonth class to get year
        long year
            = yearmonth.getLong(
                ChronoField.YEAR_OF_ERA);
        // It will store only year
        // in variable of type long

        // print results
        System.out.println("YEAR: " + year);
    }
}

输出:

YEAR: 2019

程序二:

// Java program to demonstrate
// YearMonth.getLong() method

import java.time.*;
import java.time.temporal.*;

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

        // create YearMonth object
        YearMonth yearmonth
            = YearMonth.of(2019, 4);

        // apply getLong() method
        // of YearMonth class to get month
        long month
            = yearmonth.getLong(
                ChronoField.MONTH_OF_YEAR);
        // It will store only month
        // in variable of type long

        // print results
        System.out.println("MONTH: " + month);
    }
}

输出:

MONTH: 4

参考文献:T2

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