Java month name format

Java month name format

A month-of-year, such as ‘July’. Month is an enum representing the 12 months of the year — January, February, March, April, May, June, July, August, September, October, November and December. In addition to the textual enum name, each month-of-year has an int value. The int value follows normal usage and the ISO-8601 standard, from 1 (January) to 12 (December). It is recommended that applications use the enum rather than the int value to ensure code clarity. Do not use ordinal() to obtain the numeric representation of Month . Use getValue() instead. This enum represents a common concept that is found in many calendar systems. As such, this enum may be used by any calendar system that has the month-of-year concept defined exactly equivalent to the ISO-8601 calendar system.

Enum Constant Summary

Method Summary

Methods inherited from class java.lang.Enum

Methods inherited from class java.lang.Object

Enum Constant Detail

JANUARY

FEBRUARY

The singleton instance for the month of February with 28 days, or 29 in a leap year. This has the numeric value of 2 .

MARCH

APRIL

MAY

JUNE

JULY

AUGUST

SEPTEMBER

OCTOBER

NOVEMBER

DECEMBER

Method Detail

values

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (Month c : Month.values()) System.out.println(c);

valueOf

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

of

Obtains an instance of Month from an int value. Month is an enum representing the 12 months of the year. This factory allows the enum to be obtained from the int value. The int value follows the ISO-8601 standard, from 1 (January) to 12 (December).

from

public static Month from(TemporalAccessor temporal)

Obtains an instance of Month from a temporal object. This obtains a month based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of Month . The conversion extracts the MONTH_OF_YEAR field. The extraction is only permitted if the temporal object has an ISO chronology, or can be converted to a LocalDate . This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, Month::from .

getValue

Gets the month-of-year int value. The values are numbered following the ISO-8601 standard, from 1 (January) to 12 (December).

getDisplayName

public String getDisplayName(TextStyle style, Locale locale)

Gets the textual representation, such as ‘Jan’ or ‘December’. This returns the textual name used to identify the month-of-year, suitable for presentation to the user. The parameters control the style of the returned text and the locale. If no textual mapping is found then the numeric value is returned.

isSupported

Checks if the specified field is supported. This checks if this month-of-year can be queried for the specified field. If false, then calling the range and get methods will throw an exception. If the field is MONTH_OF_YEAR then this method returns true. All other ChronoField instances will return false. If the field is not a ChronoField , then the result of this method is obtained by invoking TemporalField.isSupportedBy(TemporalAccessor) passing this as the argument. Whether the field is supported is determined by the field.

range

Gets the range of valid values for the specified field. The range object expresses the minimum and maximum valid values for a field. This month is used to enhance the accuracy of the returned range. If it is not possible to return the range, because the field is not supported or for some other reason, an exception is thrown. If the field is MONTH_OF_YEAR then the range of the month-of-year, from 1 to 12, will be returned. All other ChronoField instances will throw an UnsupportedTemporalTypeException . If the field is not a ChronoField , then the result of this method is obtained by invoking TemporalField.rangeRefinedBy(TemporalAccessor) passing this as the argument. Whether the range can be obtained is determined by the field.

get

Gets the value of the specified field from this month-of-year as an int . This queries this month for the value of the specified field. The returned value will always be within the valid range of values for the field. If it is not possible to return the value, because the field is not supported or for some other reason, an exception is thrown. If the field is MONTH_OF_YEAR then the value of the month-of-year, from 1 to 12, will be returned. All other ChronoField instances will throw an UnsupportedTemporalTypeException . If the field is not a ChronoField , then the result of this method is obtained by invoking TemporalField.getFrom(TemporalAccessor) passing this as the argument. Whether the value can be obtained, and what the value represents, is determined by the field.

getLong

Gets the value of the specified field from this month-of-year as a long . This queries this month for the value of the specified field. If it is not possible to return the value, because the field is not supported or for some other reason, an exception is thrown. If the field is MONTH_OF_YEAR then the value of the month-of-year, from 1 to 12, will be returned. All other ChronoField instances will throw an UnsupportedTemporalTypeException . If the field is not a ChronoField , then the result of this method is obtained by invoking TemporalField.getFrom(TemporalAccessor) passing this as the argument. Whether the value can be obtained, and what the value represents, is determined by the field.

plus

Returns the month-of-year that is the specified number of quarters after this one. The calculation rolls around the end of the year from December to January. The specified period may be negative. This instance is immutable and unaffected by this method call.

minus

Returns the month-of-year that is the specified number of months before this one. The calculation rolls around the start of the year from January to December. The specified period may be negative. This instance is immutable and unaffected by this method call.

length

public int length(boolean leapYear)

Gets the length of this month in days. This takes a flag to determine whether to return the length for a leap year or not. February has 28 days in a standard year and 29 days in a leap year. April, June, September and November have 30 days. All other months have 31 days.

minLength

Gets the minimum length of this month in days. February has a minimum length of 28 days. April, June, September and November have 30 days. All other months have 31 days.

maxLength

Gets the maximum length of this month in days. February has a maximum length of 29 days. April, June, September and November have 30 days. All other months have 31 days.

firstDayOfYear

public int firstDayOfYear(boolean leapYear)

Gets the day-of-year corresponding to the first day of this month. This returns the day-of-year that this month begins on, using the leap year flag to determine the length of February.

firstMonthOfQuarter

Gets the month corresponding to the first month of this quarter. The year can be divided into four quarters. This method returns the first month of the quarter for the base month. January, February and March return January. April, May and June return April. July, August and September return July. October, November and December return October.

query

Queries this month-of-year using the specified query. This queries this month-of-year using the specified query strategy object. The TemporalQuery object defines the logic to be used to obtain the result. Read the documentation of the query to understand what the result of this method will be. The result of this method is obtained by invoking the TemporalQuery.queryFrom(TemporalAccessor) method on the specified query passing this as the argument.

adjustInto

public Temporal adjustInto(Temporal temporal)

Adjusts the specified temporal object to have this month-of-year. This returns a temporal object of the same observable type as the input with the month-of-year changed to be the same as this. The adjustment is equivalent to using Temporal.with(TemporalField, long) passing ChronoField.MONTH_OF_YEAR as the field. If the specified temporal object does not use the ISO calendar system then a DateTimeException is thrown. In most cases, it is clearer to reverse the calling pattern by using Temporal.with(TemporalAdjuster) :

// these two lines are equivalent, but the second approach is recommended temporal = thisMonth.adjustInto(temporal); temporal = temporal.with(thisMonth);

dateInMay.with(JANUARY); // four months earlier dateInMay.with(APRIL); // one months earlier dateInMay.with(MAY); // same date dateInMay.with(JUNE); // one month later dateInMay.with(DECEMBER); // seven months later

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• Detail:
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