java.lang.Object
- org.jfree.data.time.RegularTimePeriod
- - org.jfree.data.time.Hour

All Implemented Interfaces:

Serializable, Comparable, MonthConstants, TimePeriod
```
public class Hour
extends RegularTimePeriod
implements Serializable
```
Represents an hour in a specific day. This class is immutable, which is a requirement for all RegularTimePeriod subclasses.

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`FIRST_HOUR_IN_DAY`	Useful constant for the first hour in the day.
`static int`	`LAST_HOUR_IN_DAY`	Useful constant for the last hour in the day.

Fields inherited from interface org.jfree.chart.date.MonthConstants
APRIL, AUGUST, DECEMBER, FEBRUARY, JANUARY, JULY, JUNE, MARCH, MAY, NOVEMBER, OCTOBER, SEPTEMBER

Constructor Summary

Constructors
Constructor	Description
`Hour()`	Constructs a new Hour, based on the system date/time.
`Hour(int hour, int day, int month, int year)`	Creates a new hour.
`Hour(int hour, Day day)`	Constructs a new Hour.
`Hour(Date time)`	Constructs a new instance, based on the supplied date/time.
`Hour(Date time, Calendar calendar)`	Constructs a new instance, based on a particular date/time.
`Hour(Date time, TimeZone zone, Locale locale)`	Constructs a new instance, based on the supplied date/time evaluated in the specified time zone.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`compareTo(Object o1)`	Returns an integer indicating the order of this Hour object relative to the specified object: negative == before, zero == same, positive == after.
`boolean`	`equals(Object obj)`	Tests the equality of this object against an arbitrary Object.
`Day`	`getDay()`	Returns the day in which this hour falls.
`int`	`getDayOfMonth()`	Returns the day-of-the-month in which this hour falls.
`long`	`getFirstMillisecond()`	Returns the first millisecond of the hour.
`long`	`getFirstMillisecond(Calendar calendar)`	Returns the first millisecond of the hour.
`int`	`getHour()`	Returns the hour.
`long`	`getLastMillisecond()`	Returns the last millisecond of the hour.
`long`	`getLastMillisecond(Calendar calendar)`	Returns the last millisecond of the hour.
`int`	`getMonth()`	Returns the month in which this hour falls.
`long`	`getSerialIndex()`	Returns a serial index number for the hour.
`int`	`getYear()`	Returns the year in which this hour falls.
`int`	`hashCode()`	Returns a hash code for this object instance.
`RegularTimePeriod`	`next()`	Returns the hour following this one.
`static Hour`	`parseHour(String s)`	Creates an Hour instance by parsing a string.
`void`	`peg(Calendar calendar)`	Recalculates the start date/time and end date/time for this time period relative to the supplied calendar (which incorporates a time zone).
`RegularTimePeriod`	`previous()`	Returns the hour preceding this one.
`String`	`toString()`	Returns a string representation of this instance, for debugging purposes.

Methods inherited from class org.jfree.data.time.RegularTimePeriod
createInstance, downsize, getCalendarInstance, getEnd, getMiddleMillisecond, getMiddleMillisecond, getMillisecond, getStart, setCalendarInstancePrototype, setThreadLocalCalendarInstance

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - FIRST_HOUR_IN_DAY
```
public static final int FIRST_HOUR_IN_DAY
```
    Useful constant for the first hour in the day.
    
    See Also:
    
    Constant Field Values
  - LAST_HOUR_IN_DAY
```
public static final int LAST_HOUR_IN_DAY
```
    Useful constant for the last hour in the day.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - Hour
```
public Hour()
```
    Constructs a new Hour, based on the system date/time. The time zone and locale are determined by the calendar returned by RegularTimePeriod.getCalendarInstance().
  - Hour
```
public Hour(int hour,
            Day day)
```
    Constructs a new Hour. The time zone and locale are determined by the calendar returned by RegularTimePeriod.getCalendarInstance().
    
    Parameters:
    
    hour - the hour (in the range 0 to 23).
    
    day - the day (null not permitted).
  - Hour
```
public Hour(int hour,
            int day,
            int month,
            int year)
```
    Creates a new hour. The time zone and locale are determined by the calendar returned by RegularTimePeriod.getCalendarInstance().
    
    Parameters:
    
    hour - the hour (0-23).
    
    day - the day (1-31).
    
    month - the month (1-12).
    
    year - the year (1900-9999).
  - Hour
```
public Hour(Date time)
```
    Constructs a new instance, based on the supplied date/time. The time zone and locale are determined by the calendar returned by RegularTimePeriod.getCalendarInstance().
    
    Parameters:
    
    time - the date-time (null not permitted).
    
    See Also:
    
    Hour(Date, TimeZone, Locale)
  - Hour
```
public Hour(Date time,
            TimeZone zone,
            Locale locale)
```
    Constructs a new instance, based on the supplied date/time evaluated in the specified time zone.
    
    Parameters:
    
    time - the date-time (null not permitted).
    
    zone - the time zone (null not permitted).
    
    locale - the locale (null not permitted).
    
    Since:
    
    1.0.13
  - Hour
```
public Hour(Date time,
            Calendar calendar)
```
    Constructs a new instance, based on a particular date/time. The time zone and locale are determined by the calendar parameter.
    
    Parameters:
    
    time - the date/time (null not permitted).
    
    calendar - the calendar to use for calculations (null not permitted).
- Method Detail
  - getHour
```
public int getHour()
```
    Returns the hour.
    
    Returns:
    
    The hour (0 <= hour <= 23).
  - getDay
```
public Day getDay()
```
    Returns the day in which this hour falls.
    
    Returns:
    
    The day.
  - getYear
```
public int getYear()
```
    Returns the year in which this hour falls.
    
    Returns:
    
    The year.
  - getMonth
```
public int getMonth()
```
    Returns the month in which this hour falls.
    
    Returns:
    
    The month.
  - getDayOfMonth
```
public int getDayOfMonth()
```
    Returns the day-of-the-month in which this hour falls.
    
    Returns:
    
    The day-of-the-month.
  - getFirstMillisecond
```
public long getFirstMillisecond()
```
    Returns the first millisecond of the hour. This will be determined relative to the time zone specified in the constructor, or in the calendar instance passed in the most recent call to the peg(Calendar) method.
    
    Specified by:
    
    getFirstMillisecond in class RegularTimePeriod
    
    Returns:
    
    The first millisecond of the hour.
    
    See Also:
    
    getLastMillisecond()
  - getLastMillisecond
```
public long getLastMillisecond()
```
    Returns the last millisecond of the hour. This will be determined relative to the time zone specified in the constructor, or in the calendar instance passed in the most recent call to the peg(Calendar) method.
    
    Specified by:
    
    getLastMillisecond in class RegularTimePeriod
    
    Returns:
    
    The last millisecond of the hour.
    
    See Also:
    
    getFirstMillisecond()
  - peg
```
public void peg(Calendar calendar)
```
    Recalculates the start date/time and end date/time for this time period relative to the supplied calendar (which incorporates a time zone).
    
    Specified by:
    
    peg in class RegularTimePeriod
    
    Parameters:
    
    calendar - the calendar (null not permitted).
    
    Since:
    
    1.0.3
  - previous
```
public RegularTimePeriod previous()
```
    Returns the hour preceding this one. No matter what time zone and locale this instance was created with, the returned instance will use the default calendar for time calculations, obtained with RegularTimePeriod.getCalendarInstance().
    
    Specified by:
    
    previous in class RegularTimePeriod
    
    Returns:
    
    The hour preceding this one.
  - next
```
public RegularTimePeriod next()
```
    Returns the hour following this one. No matter what time zone and locale this instance was created with, the returned instance will use the default calendar for time calculations, obtained with RegularTimePeriod.getCalendarInstance().
    
    Specified by:
    
    next in class RegularTimePeriod
    
    Returns:
    
    The hour following this one.
  - getSerialIndex
```
public long getSerialIndex()
```
    Returns a serial index number for the hour.
    
    Specified by:
    
    getSerialIndex in class RegularTimePeriod
    
    Returns:
    
    The serial index number.
  - getFirstMillisecond
```
public long getFirstMillisecond(Calendar calendar)
```
    Returns the first millisecond of the hour.
    
    Specified by:
    
    getFirstMillisecond in class RegularTimePeriod
    
    Parameters:
    
    calendar - the calendar/timezone (null not permitted).
    
    Returns:
    
    The first millisecond.
    
    Throws:
    
    NullPointerException - if calendar is null.
    
    See Also:
    
    RegularTimePeriod.getLastMillisecond(Calendar)
  - getLastMillisecond
```
public long getLastMillisecond(Calendar calendar)
```
    Returns the last millisecond of the hour.
    
    Specified by:
    
    getLastMillisecond in class RegularTimePeriod
    
    Parameters:
    
    calendar - the calendar/timezone (null not permitted).
    
    Returns:
    
    The last millisecond.
    
    Throws:
    
    NullPointerException - if calendar is null.
    
    See Also:
    
    RegularTimePeriod.getFirstMillisecond(Calendar)
  - equals
```
public boolean equals(Object obj)
```
    Tests the equality of this object against an arbitrary Object.
    This method will return true ONLY if the object is an Hour object representing the same hour as this instance.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    
    obj - the object to compare (null permitted).
    
    Returns:
    
    true if the hour and day value of the object is the same as this.
  - toString
```
public String toString()
```
    Returns a string representation of this instance, for debugging purposes.
    
    Overrides:
    
    toString in class RegularTimePeriod
    
    Returns:
    
    A string.
  - hashCode
```
public int hashCode()
```
    Returns a hash code for this object instance. The approach described by Joshua Bloch in "Effective Java" has been used here:
    http://developer.java.sun.com/developer/Books/effectivejava /Chapter3.pdf
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    A hash code.
  - compareTo
```
public int compareTo(Object o1)
```
    Returns an integer indicating the order of this Hour object relative to the specified object: negative == before, zero == same, positive == after.
    
    Specified by:
    
    compareTo in interface Comparable
    
    Parameters:
    
    o1 - the object to compare.
    
    Returns:
    
    negative == before, zero == same, positive == after.
  - parseHour
```
public static Hour parseHour(String s)
```
    Creates an Hour instance by parsing a string. The string is assumed to be in the format "YYYY-MM-DD HH", perhaps with leading or trailing whitespace.
    
    Parameters:
    
    s - the hour string to parse.
    
    Returns:
    
    null if the string is not parseable, the hour otherwise.

Class Hour

Field Summary

Fields inherited from interface org.jfree.chart.date.MonthConstants

Constructor Summary

Method Summary

Methods inherited from class org.jfree.data.time.RegularTimePeriod

Methods inherited from class java.lang.Object

Field Detail

FIRST_HOUR_IN_DAY

LAST_HOUR_IN_DAY

Constructor Detail

Hour

Hour

Hour

Hour

Hour

Hour

Method Detail

getHour

getDay

getYear

getMonth

getDayOfMonth

getFirstMillisecond

getLastMillisecond

peg

previous

next

getSerialIndex

getFirstMillisecond

getLastMillisecond

equals

toString

hashCode

compareTo

parseHour