Java 中的 LocalDate getLong()方法，带示例
原文:https://www . geesforgeks . org/local date-getlong-method-in-Java-with-examples/
Java 中 LocalDate 类的 getLong()方法得到了在这个日期适用的纪元。
语法 :
public long getLong(TemporalField field)
参数:该方法接受单个强制参数字段，指定要获取的字段，不为空。
返回值:该函数返回该字段的值。
异常:程序抛出三个异常，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, an exception will be thrown.
- Unsupported Temporaltypeexception : If this field is not supported or the range of values exceeds a long integer, it will be thrown.
- Arithmetic exception : thrown when numerical value overflows.
下面的程序说明了 Java 中 LocalDate 的 getLong() 方法:
程序 1 :
// Program to illustrate the getLong() method
import java.util.*;
import java.time.*;
import java.time.temporal.ChronoField;
public class GfG {
public static void main(String[] args)
{
// Parses the date
LocalDate dt = LocalDate.parse("2018-11-27");
// Prints the day number
System.out.println(dt.getLong(ChronoField.DAY_OF_MONTH));
}
}
输出:
27
程序二 :
// Program to illustrate the getLong() method
import java.util.*;
import java.time.*;
import java.time.temporal.ChronoField;
public class GfG {
public static void main(String[] args)
{
// Parses the date
LocalDate dt = LocalDate.parse("2018-11-27");
// Prints the day number
System.out.println(dt.getLong(ChronoField.DAY_OF_YEAR));
}
}
输出:
331
程序 3 :
// Program to illustrate the getLong() method
// Exception Program
import java.util.*;
import java.time.*;
import java.time.temporal.ChronoField;
public class GfG {
public static void main(String[] args)
{
try {
LocalDate dt = LocalDate.parse("2017-01-32");
System.out.println(dt.getLong(ChronoField.DAY_OF_MONTH));
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
java.time.format.DateTimeParseException: Text '2017-01-32' could not be parsed: Invalid value for DayOfMonth (valid values 1 - 28/31): 32
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