Enum Quarter

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<Quarter>, java.time.temporal.TemporalAccessor, java.time.temporal.TemporalAdjuster

    public enum Quarter
    extends java.lang.Enum<Quarter>
    implements java.time.temporal.TemporalAccessor, java.time.temporal.TemporalAdjuster
    A quarter-of-year, such as 'Q2'.

    Quarter is an enum representing the 4 quarters of the year - Q1, Q2, Q3 and Q4. These are defined as January to March, April to June, July to September and October to December.

    The int value follows the quarter, from 1 (Q1) to 4 (Q4). 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 Quarter. 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 quarter-of-year concept defined exactly equivalent to the ISO calendar system.

    Implementation Requirements:

    This is an immutable and thread-safe enum.
    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      Q1
      The singleton instance for the first quarter-of-year, from January to March.
      Q2
      The singleton instance for the second quarter-of-year, from April to June.
      Q3
      The singleton instance for the third quarter-of-year, from July to September.
      Q4
      The singleton instance for the fourth quarter-of-year, from October to December.
    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.time.temporal.Temporal adjustInto​(java.time.temporal.Temporal temporal)
      Adjusts the specified temporal object to have this quarter-of-year.
      java.time.Month firstMonth()
      Gets the first of the three months that this quarter refers to.
      static Quarter from​(java.time.temporal.TemporalAccessor temporal)
      Obtains an instance of Quarter from a temporal object.
      int get​(java.time.temporal.TemporalField field)
      Gets the value of the specified field from this quarter-of-year as an int.
      java.lang.String getDisplayName​(java.time.format.TextStyle style, java.util.Locale locale)
      Gets the textual representation, such as 'Q1' or '4th quarter'.
      long getLong​(java.time.temporal.TemporalField field)
      Gets the value of the specified field from this quarter-of-year as a long.
      int getValue()
      Gets the quarter-of-year int value.
      boolean isSupported​(java.time.temporal.TemporalField field)
      Checks if the specified field is supported.
      int length​(boolean leapYear)
      Gets the length of this quarter in days.
      Quarter minus​(long quarters)
      Returns the quarter that is the specified number of quarters before this one.
      static Quarter of​(int quarterOfYear)
      Obtains an instance of Quarter from an int value.
      static Quarter ofMonth​(int monthOfYear)
      Obtains an instance of Quarter from a month-of-year.
      Quarter plus​(long quarters)
      Returns the quarter that is the specified number of quarters after this one.
      <R> R query​(java.time.temporal.TemporalQuery<R> query)
      Queries this quarter-of-year using the specified query.
      java.time.temporal.ValueRange range​(java.time.temporal.TemporalField field)
      Gets the range of valid values for the specified field.
      static Quarter valueOf​(java.lang.String name)
      Returns the enum constant of this type with the specified name.
      static Quarter[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.
      • Methods inherited from class java.lang.Enum

        clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait
    • Enum Constant Detail

      • Q1

        public static final Quarter Q1
        The singleton instance for the first quarter-of-year, from January to March. This has the numeric value of 1.
      • Q2

        public static final Quarter Q2
        The singleton instance for the second quarter-of-year, from April to June. This has the numeric value of 2.
      • Q3

        public static final Quarter Q3
        The singleton instance for the third quarter-of-year, from July to September. This has the numeric value of 3.
      • Q4

        public static final Quarter Q4
        The singleton instance for the fourth quarter-of-year, from October to December. This has the numeric value of 4.
    • Method Detail

      • values

        public static Quarter[] 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 (Quarter c : Quarter.values())
            System.out.println(c);
        
        Returns:
        an array containing the constants of this enum type, in the order they are declared
      • valueOf

        public static Quarter valueOf​(java.lang.String name)
        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.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
        java.lang.NullPointerException - if the argument is null
      • of

        public static Quarter of​(int quarterOfYear)
        Obtains an instance of Quarter from an int value.

        Quarter is an enum representing the 4 quarters of the year. This factory allows the enum to be obtained from the int value. The int value follows the quarter, from 1 (Q1) to 4 (Q4).

        Parameters:
        quarterOfYear - the quarter-of-year to represent, from 1 (Q1) to 4 (Q4)
        Returns:
        the quarter-of-year, not null
        Throws:
        java.time.DateTimeException - if the quarter-of-year is invalid
      • ofMonth

        public static Quarter ofMonth​(int monthOfYear)
        Obtains an instance of Quarter from a month-of-year.

        Quarter is an enum representing the 4 quarters of the year. This factory allows the enum to be obtained from the Month value.

        January to March are Q1, April to June are Q2, July to September are Q3 and October to December are Q4.

        Parameters:
        monthOfYear - the month-of-year to convert from, from 1 to 12
        Returns:
        the quarter-of-year, not null
        Throws:
        java.time.DateTimeException - if the month-of-year is invalid
      • from

        public static Quarter from​(java.time.temporal.TemporalAccessor temporal)
        Obtains an instance of Quarter from a temporal object.

        This obtains a quarter based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of Quarter.

        The conversion extracts the QUARTER_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 in queries via method reference, Quarter::from.

        Parameters:
        temporal - the temporal-time object to convert, not null
        Returns:
        the quarter-of-year, not null
        Throws:
        java.time.DateTimeException - if unable to convert to a Quarter
      • getValue

        public int getValue()
        Gets the quarter-of-year int value.

        The values are numbered following the ISO-8601 standard, from 1 (Q1) to 4 (Q4).

        Returns:
        the quarter-of-year, from 1 (Q1) to 4 (Q4)
      • getDisplayName

        public java.lang.String getDisplayName​(java.time.format.TextStyle style,
                                               java.util.Locale locale)
        Gets the textual representation, such as 'Q1' or '4th quarter'.

        This returns the textual name used to identify the quarter-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.

        Parameters:
        style - the length of the text required, not null
        locale - the locale to use, not null
        Returns:
        the text value of the quarter-of-year, not null
      • isSupported

        public boolean isSupported​(java.time.temporal.TemporalField field)
        Checks if the specified field is supported.

        This checks if this quarter-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 QUARTER_OF_YEAR then this method returns true. All 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.

        Specified by:
        isSupported in interface java.time.temporal.TemporalAccessor
        Parameters:
        field - the field to check, null returns false
        Returns:
        true if the field is supported on this quarter-of-year, false if not
      • range

        public java.time.temporal.ValueRange range​(java.time.temporal.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 quarter 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 QUARTER_OF_YEAR then the range of the quarter-of-year, from 1 to 4, will be returned. All 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.

        Specified by:
        range in interface java.time.temporal.TemporalAccessor
        Parameters:
        field - the field to query the range for, not null
        Returns:
        the range of valid values for the field, not null
        Throws:
        java.time.DateTimeException - if the range for the field cannot be obtained
        java.time.temporal.UnsupportedTemporalTypeException - if the field is not supported
      • get

        public int get​(java.time.temporal.TemporalField field)
        Gets the value of the specified field from this quarter-of-year as an int.

        This queries this quarter for the value for 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 QUARTER_OF_YEAR then the value of the quarter-of-year, from 1 to 4, will be returned. All 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.

        Specified by:
        get in interface java.time.temporal.TemporalAccessor
        Parameters:
        field - the field to get, not null
        Returns:
        the value for the field, within the valid range of values
        Throws:
        java.time.DateTimeException - if a value for the field cannot be obtained or the value is outside the range of valid values for the field
        java.time.temporal.UnsupportedTemporalTypeException - if the field is not supported or the range of values exceeds an int
        java.lang.ArithmeticException - if numeric overflow occurs
      • getLong

        public long getLong​(java.time.temporal.TemporalField field)
        Gets the value of the specified field from this quarter-of-year as a long.

        This queries this quarter for the value for 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 QUARTER_OF_YEAR then the value of the quarter-of-year, from 1 to 4, 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.

        Specified by:
        getLong in interface java.time.temporal.TemporalAccessor
        Parameters:
        field - the field to get, not null
        Returns:
        the value for the field
        Throws:
        java.time.DateTimeException - if a value for the field cannot be obtained
        java.time.temporal.UnsupportedTemporalTypeException - if the field is not supported
        java.lang.ArithmeticException - if numeric overflow occurs
      • plus

        public Quarter plus​(long quarters)
        Returns the quarter that is the specified number of quarters after this one.

        The calculation rolls around the end of the year from Q4 to Q1. The specified period may be negative.

        This instance is immutable and unaffected by this method call.

        Parameters:
        quarters - the quarters to add, positive or negative
        Returns:
        the resulting quarter, not null
      • minus

        public Quarter minus​(long quarters)
        Returns the quarter that is the specified number of quarters before this one.

        The calculation rolls around the start of the year from Q1 to Q4. The specified period may be negative.

        This instance is immutable and unaffected by this method call.

        Parameters:
        quarters - the quarters to subtract, positive or negative
        Returns:
        the resulting quarter, not null
      • length

        public int length​(boolean leapYear)
        Gets the length of this quarter in days.

        This takes a flag to determine whether to return the length for a leap year or not.

        Q1 has 90 in a standard year and 91 days in a leap year. Q2 has 91 days. Q3 and Q4 have 92 days.

        Parameters:
        leapYear - true if the length is required for a leap year
        Returns:
        the length of this month in days, from 90 to 92
      • firstMonth

        public java.time.Month firstMonth()
        Gets the first of the three months that this quarter refers to.

        Q1 will return January.
        Q2 will return April.
        Q3 will return July.
        Q4 will return October.

        To obtain the other two months of the quarter, simply use Month.plus(long) on the returned month.

        Returns:
        the first month in the quarter, not null
      • query

        public <R> R query​(java.time.temporal.TemporalQuery<R> query)
        Queries this quarter-of-year using the specified query.

        This queries this quarter-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.

        Specified by:
        query in interface java.time.temporal.TemporalAccessor
        Type Parameters:
        R - the type of the result
        Parameters:
        query - the query to invoke, not null
        Returns:
        the query result, null may be returned (defined by the query)
        Throws:
        java.time.DateTimeException - if unable to query (defined by the query)
        java.lang.ArithmeticException - if numeric overflow occurs (defined by the query)
      • adjustInto

        public java.time.temporal.Temporal adjustInto​(java.time.temporal.Temporal temporal)
        Adjusts the specified temporal object to have this quarter-of-year.

        This returns a temporal object of the same observable type as the input with the quarter-of-year changed to be the same as this.

        The adjustment is equivalent to using Temporal.with(TemporalField, long) passing IsoFields.QUARTER_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 = thisQuarter.adjustInto(temporal);
           temporal = temporal.with(thisQuarter);
         

        For example, given a date in May, the following are output:

           dateInMay.with(Q1);    // three months earlier
           dateInMay.with(Q2);    // no change
           dateInMay.with(Q3);    // three months later
           dateInMay.with(Q4);    // six months later
         

        This instance is immutable and unaffected by this method call.

        Specified by:
        adjustInto in interface java.time.temporal.TemporalAdjuster
        Parameters:
        temporal - the target object to be adjusted, not null
        Returns:
        the adjusted object, not null
        Throws:
        java.time.DateTimeException - if unable to make the adjustment
        java.lang.ArithmeticException - if numeric overflow occurs