Month

java.lang.Object
- java.lang.Enum<Month>
- - java.time.Month

所有已实现的接口:

Serializable, Comparable<Month>, TemporalAccessor, TemporalAdjuster
```
public enum Month
extends Enum<Month>
implements TemporalAccessor, TemporalAdjuster
```
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.

从以下版本开始:

1.8

枚举常量概要

枚举常量
枚举常量	说明
`APRIL`	The singleton instance for the month of April with 30 days.
`AUGUST`	The singleton instance for the month of August with 31 days.
`DECEMBER`	The singleton instance for the month of December with 31 days.
`FEBRUARY`	The singleton instance for the month of February with 28 days, or 29 in a leap year.
`JANUARY`	The singleton instance for the month of January with 31 days.
`JULY`	The singleton instance for the month of July with 31 days.
`JUNE`	The singleton instance for the month of June with 30 days.
`MARCH`	The singleton instance for the month of March with 31 days.
`MAY`	The singleton instance for the month of May with 31 days.
`NOVEMBER`	The singleton instance for the month of November with 30 days.
`OCTOBER`	The singleton instance for the month of October with 31 days.
`SEPTEMBER`	The singleton instance for the month of September with 30 days.

方法概要

所有方法静态方法实例方法具体方法
限定符和类型	方法	说明
`Temporal`	`adjustInto(Temporal temporal)`	Adjusts the specified temporal object to have this month-of-year.
`int`	`firstDayOfYear(boolean leapYear)`	Gets the day-of-year corresponding to the first day of this month.
`Month`	`firstMonthOfQuarter()`	Gets the month corresponding to the first month of this quarter.
`static Month`	`from(TemporalAccessor temporal)`	Obtains an instance of `Month` from a temporal object.
`int`	`get(TemporalField field)`	Gets the value of the specified field from this month-of-year as an `int`.
`String`	`getDisplayName(TextStyle style, Locale locale)`	Gets the textual representation, such as 'Jan' or 'December'.
`long`	`getLong(TemporalField field)`	Gets the value of the specified field from this month-of-year as a `long`.
`int`	`getValue()`	Gets the month-of-year `int` value.
`boolean`	`isSupported(TemporalField field)`	Checks if the specified field is supported.
`int`	`length(boolean leapYear)`	Gets the length of this month in days.
`int`	`maxLength()`	Gets the maximum length of this month in days.
`int`	`minLength()`	Gets the minimum length of this month in days.
`Month`	`minus(long months)`	Returns the month-of-year that is the specified number of months before this one.
`static Month`	`of(int month)`	Obtains an instance of `Month` from an `int` value.
`Month`	`plus(long months)`	Returns the month-of-year that is the specified number of quarters after this one.
`<R> R`	`query(TemporalQuery<R> query)`	Queries this month-of-year using the specified query.
`ValueRange`	`range(TemporalField field)`	Gets the range of valid values for the specified field.
`static Month`	`valueOf(String name)`	返回带有指定名称的该类型的枚举常量。字符串必须与用于声明该类型的枚举常量的标识符完全匹配。(不允许有多余的空格字符。)
`static Month[]`	`values()`	按照声明该枚举类型的常量的顺序, 返回包含这些常量的数组。该方法可用于迭代常量, 如下所示: for (Month c : Month.values()) System.out.println(c);

从类继承的方法 java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- 枚举常量详细资料
  - JANUARY
```
public static final Month JANUARY
```
    The singleton instance for the month of January with 31 days. This has the numeric value of 1.
  - FEBRUARY
```
public static final Month 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
```
public static final Month MARCH
```
    The singleton instance for the month of March with 31 days. This has the numeric value of 3.
  - APRIL
```
public static final Month APRIL
```
    The singleton instance for the month of April with 30 days. This has the numeric value of 4.
  - MAY
```
public static final Month MAY
```
    The singleton instance for the month of May with 31 days. This has the numeric value of 5.
  - JUNE
```
public static final Month JUNE
```
    The singleton instance for the month of June with 30 days. This has the numeric value of 6.
  - JULY
```
public static final Month JULY
```
    The singleton instance for the month of July with 31 days. This has the numeric value of 7.
  - AUGUST
```
public static final Month AUGUST
```
    The singleton instance for the month of August with 31 days. This has the numeric value of 8.
  - SEPTEMBER
```
public static final Month SEPTEMBER
```
    The singleton instance for the month of September with 30 days. This has the numeric value of 9.
  - OCTOBER
```
public static final Month OCTOBER
```
    The singleton instance for the month of October with 31 days. This has the numeric value of 10.
  - NOVEMBER
```
public static final Month NOVEMBER
```
    The singleton instance for the month of November with 30 days. This has the numeric value of 11.
  - DECEMBER
```
public static final Month DECEMBER
```
    The singleton instance for the month of December with 31 days. This has the numeric value of 12.
- 方法详细资料
  - values
```
public static Month[] values()
```
    按照声明该枚举类型的常量的顺序, 返回包含这些常量的数组。该方法可用于迭代常量, 如下所示:
```
for (Month c : Month.values())
    System.out.println(c);
```
    返回:
    
    按照声明该枚举类型的常量的顺序返回的包含这些常量的数组
  - valueOf
```
public static Month valueOf(String name)
```
    返回带有指定名称的该类型的枚举常量。字符串必须与用于声明该类型的枚举常量的标识符完全匹配。(不允许有多余的空格字符。)
    
    参数:
    
    name - 要返回的枚举常量的名称。
    
    返回:
    
    返回带有指定名称的枚举常量
    
    抛出:
    
    IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量
    
    NullPointerException - 如果参数为空值
  - of
```
public static Month of(int month)
```
    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).
    
    参数:
    
    month - the month-of-year to represent, from 1 (January) to 12 (December)
    
    返回:
    
    the month-of-year, not null
    
    抛出:
    
    DateTimeException - if the month-of-year is invalid
  - 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 ChronoField#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.
    
    参数:
    
    temporal - the temporal object to convert, not null
    
    返回:
    
    the month-of-year, not null
    
    抛出:
    
    DateTimeException - if unable to convert to a Month
  - getValue
```
public int getValue()
```
    Gets the month-of-year int value.
    The values are numbered following the ISO-8601 standard, from 1 (January) to 12 (December).
    
    返回:
    
    the month-of-year, 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.
    
    参数:
    
    style - the length of the text required, not null
    
    locale - the locale to use, not null
    
    返回:
    
    the text value of the month-of-year, not null
  - isSupported
```
public boolean isSupported(TemporalField field)
```
    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 ChronoField#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.
    
    指定者:
    
    isSupported 在接口中 TemporalAccessor
    
    参数:
    
    field - the field to check, null returns false
    
    返回:
    
    true if the field is supported on this month-of-year, false if not
  - range
```
public ValueRange range(TemporalField field)
```
    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 ChronoField#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.
    
    指定者:
    
    range 在接口中 TemporalAccessor
    
    参数:
    
    field - the field to query the range for, not null
    
    返回:
    
    the range of valid values for the field, not null
    
    抛出:
    
    DateTimeException - if the range for the field cannot be obtained
    
    UnsupportedTemporalTypeException - if the field is not supported
  - get
```
public int get(TemporalField field)
```
    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 ChronoField#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.
    
    指定者:
    
    get 在接口中 TemporalAccessor
    
    参数:
    
    field - the field to get, not null
    
    返回:
    
    the value for the field, within the valid range of values
    
    抛出:
    
    DateTimeException - if a value for the field cannot be obtained or the value is outside the range of valid values for the field
    
    UnsupportedTemporalTypeException - if the field is not supported or the range of values exceeds an int
    
    ArithmeticException - if numeric overflow occurs
  - getLong
```
public long getLong(TemporalField field)
```
    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 ChronoField#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.
    
    指定者:
    
    getLong 在接口中 TemporalAccessor
    
    参数:
    
    field - the field to get, not null
    
    返回:
    
    the value for the field
    
    抛出:
    
    DateTimeException - if a value for the field cannot be obtained
    
    UnsupportedTemporalTypeException - if the field is not supported
    
    ArithmeticException - if numeric overflow occurs
  - plus
```
public Month plus(long months)
```
    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.
    
    参数:
    
    months - the months to add, positive or negative
    
    返回:
    
    the resulting month, not null
  - minus
```
public Month minus(long months)
```
    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.
    
    参数:
    
    months - the months to subtract, positive or negative
    
    返回:
    
    the resulting month, not null
  - 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.
    
    参数:
    
    leapYear - true if the length is required for a leap year
    
    返回:
    
    the length of this month in days, from 28 to 31
  - minLength
```
public int 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.
    
    返回:
    
    the minimum length of this month in days, from 28 to 31
  - maxLength
```
public int 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.
    
    返回:
    
    the maximum length of this month in days, from 29 to 31
  - 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.
    
    参数:
    
    leapYear - true if the length is required for a leap year
    
    返回:
    
    the day of year corresponding to the first day of this month, from 1 to 336
  - firstMonthOfQuarter
```
public Month 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.
    
    返回:
    
    the first month of the quarter corresponding to this month, not null
  - query
```
public <R> R query(TemporalQuery<R> 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.
    
    指定者:
    
    query 在接口中 TemporalAccessor
    
    类型参数:
    
    R - the type of the result
    
    参数:
    
    query - the query to invoke, not null
    
    返回:
    
    the query result, null may be returned (defined by the query)
    
    抛出:
    
    DateTimeException - if unable to query (defined by the query)
    
    ArithmeticException - if numeric overflow occurs (defined by the query)
  - 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);
 
```
    For example, given a date in May, the following are output:
```
   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
 
```
    This instance is immutable and unaffected by this method call.
    指定者:
    
    adjustInto 在接口中 TemporalAdjuster
    
    参数:
    
    temporal - the target object to be adjusted, not null
    
    返回:
    
    the adjusted object, not null
    
    抛出:
    
    DateTimeException - if unable to make the adjustment
    
    ArithmeticException - if numeric overflow occurs

枚举 Month

枚举常量概要

方法概要

从类继承的方法 java.lang.Enum

从类继承的方法 java.lang.Object

枚举常量详细资料

JANUARY

FEBRUARY

MARCH

APRIL

MAY

JUNE

JULY

AUGUST

SEPTEMBER

OCTOBER

NOVEMBER

DECEMBER

方法详细资料

values

valueOf

of

from

getValue

getDisplayName

isSupported

range

get

getLong

plus

minus

length

minLength

maxLength

firstDayOfYear

firstMonthOfQuarter

query

adjustInto