Package edu.princeton.cs.algs4

Class Date

Object

edu.princeton.cs.algs4.Date

All Implemented Interfaces:

Comparable<Date>

public class Date
extends Object
implements Comparable<Date>

The Date class is an immutable data type to encapsulate a date (day, month, and year).

For additional documentation, see Section 1.2 of Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne.

Author:

Robert Sedgewick, Kevin Wayne

Constructor Summary

Constructors

Constructor	Description
Date(int month, int day, int year)	Initializes a new date from the month, day, and year.
Date(String date)	Initializes new date specified as a string in form MM/DD/YYYY.

Method Summary

Modifier and Type	Method	Description
int	compareTo(Date that)	Compares two dates chronologically.
int	day()	Returns the day.
boolean	equals(Object other)	Compares this date to the specified date.
int	hashCode()	Returns an integer hash code for this date.
boolean	isAfter(Date that)	Compares two dates chronologically.
boolean	isBefore(Date that)	Compares two dates chronologically.
static void	main(String[] args)	Unit tests the Date data type.
int	month()	Return the month.
Date	next()	Returns the next date in the calendar.
String	toString()	Returns a string representation of this date.
int	year()	Returns the year.

Methods inherited from class java.lang.Object

clone, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Date

public Date(int month,
            int day,
            int year)

Initializes a new date from the month, day, and year.

Parameters:

month - the month (between 1 and 12)

day - the day (between 1 and 28-31, depending on the month)

year - the year

Throws:

IllegalArgumentException - if this date is invalid

Date

public Date(String date)

Initializes new date specified as a string in form MM/DD/YYYY.

Parameters:

date - the string representation of this date

Throws:

IllegalArgumentException - if this date is invalid

Method Detail

month

public int month()

Return the month.

Returns:

the month (an integer between 1 and 12)

day

public int day()

Returns the day.

Returns:

the day (an integer between 1 and 31)

year

public int year()

Returns the year.

Returns:

the year

next

public Date next()

Returns the next date in the calendar.

Returns:

a date that represents the next day after this day

isAfter

public boolean isAfter(Date that)

Compares two dates chronologically.

Parameters:

that - the other date

Returns:

true if this date is after that date; false otherwise

isBefore

public boolean isBefore(Date that)

Compares two dates chronologically.

Parameters:

that - the other date

Returns:

true if this date is before that date; false otherwise

compareTo

public int compareTo(Date that)

Compares two dates chronologically.

Specified by:

compareTo in interface Comparable<Date>

Returns:

the value 0 if the argument date is equal to this date; a negative integer if this date is chronologically less than the argument date; and a positive integer if this date is chronologically after the argument date

toString

public String toString()

Returns a string representation of this date.

Overrides:

toString in class Object

Returns:

the string representation in the format MM/DD/YYYY

equals

public boolean equals(Object other)

Compares this date to the specified date.

Overrides:

equals in class Object

Parameters:

other - the other date

Returns:

true if this date equals other; false otherwise

hashCode

public int hashCode()

Returns an integer hash code for this date.

Overrides:

hashCode in class Object

Returns:

an integer hash code for this date

main

public static void main(String[] args)

Unit tests the Date data type.

Parameters:

args - the command-line arguments