Write a class called Date that includes three fields year, month and day. This c
ID: 3670820 • Letter: W
Question
Write a class called Date that includes three fields year, month and day. This class stores information about a single date (year, month and day). Your class should have constructor(s), accessors and mutators and it should implement the Comparable interface. Years take precedence over months, which take precedence over days. For example, Feb 19, 2016 comes after Nov 20, 2015.
The following class DateTest can be used to test the Date class that you wrote. It creates a list of the birthdays of the first 5 U.S. presidents in random order and puts them into sorted order. (Note: you can use Collections.sort() to sort your ArrayList after you implement the compareTo() method).
Explanation / Answer
public class Date
{
private int year;
private int month;
private int day;
private boolean shortDisplay = true;
public Date()
{
setDate(2016, 02, 22) ;
}
public Date(int yy, int mm, int dd)
{
setDate(int yy, int mm)
}
public Date(Date otherDate)
{
setDate(otherDate);
}
public void setDate(int yy, int mm, int dd)
{
setYear(yy);
setMonth(mm);
setDay(dd);
}
public void setDate(int yy, int mm)
{
setYear(yy);
setMonth(mm);
setDay(1);
}
public void setDate(int yy)
{
setYear(yy);
setMonth(1);
setDay(1);
}
public void setDate(Date otherDate)
{
int yy = getYear();
int mm = getMonth();
int dd = getDay();
setYear(yy);
setMonth(mm);
setDate(dd);
}
public void setDate(String dateStr)
{
int length = dateStr.length();
int indexCount = 0;
if (length >= 0)
{
// basically checking to see if the date even exists
if(dateStr.indexof(' / ') >= 0)
{
int index = dateStr.indexof(' / ');
indexCount++;
String dd = dateStr.substring(index+1, dateStr.length());
if (dd.substring(1, dd.length()).lastIndexOf( ' / ') >= 0 )
{
int index2 = dd.lastIndexOf(' / ');
indexCount++;
String yy = dd.substring(index2+1, dd.length());
if (yy.lastIndexOf(' / ') >= 0)
{
indexCount++;
}
String mm = dateStr.substring(0, index);
dd = dd.substring(0, index2);
yy = yy.substring(0, yy.length());
System.out.println(mm + " " + dd + " " + yy );
int y = Integer.parseInt(yy);
int d = Integer.parseInt(dd);
int m = Integer.parseInt(mm);
setYear(y);
setMonth(m);
setDay(d);
}
}
}
}
public void setYear(int yy)
{
if (yy >= 1990)
{
year = yy;
}
else
{
throw new IllegalArgumentException("lol");
}
}
public void setMonth(int mm)
{
if (mm >= 1 && mm<= 12)
{
month = mm;
}
else
{
throw new IllegalArgumentException("not cool");
}
}
public void setDay(int dd)
{
if (dd >= 1 && dd <= 31)
{
month = dd;
}
else
{
throw new IllegalArgumentException("stupid");
}
}
public int getYear()
{
return year;
}
public int getMonth()
{
return month;
}
public int getDay()
{
return day;
}
public void setShortDisplay()
{
shortDisplay = true;
}
public void setShortDisplay()
{
shortDisplay = false;
}
public boolean isShortDisplay()
{
if (shortDisplay)
{
return true;
}
else
{
return false;
}
}
public void incrementDay()
{
day++;
if (day > 31){
day = 1;
incrementMonth();
}
}
public void incrementMonth()
{
month++;
if (month > 12){
month = 1;
incrementYear();
}
}
public void incrementYear()
{
year++;
}
public boolean equals(Object other){
Date that = (Date) other;
if(this.day == that.day && this.month == that.month && this.year == that.year){
return true;
}
else{
return.false;
}
}
public boolean before(Date otherDate){
Date that = otherDate;
if (this.year < that.year) return true;
if (this.month < that.month) return true;
if (this.day < that.day) return true;
else return false;
}
public String toString()
{
boolean check = isShortDisplay();
if (check){
if (month < 10 && day < 10){
return "0" + month + " / " + day + " / " + year;
}
if (month < 10 && day > 10){
return "0" + month + " / " + day + " / " + year;
}
if (month > 10 && day < 10){
return month + " / " + day + " / " + year;
}
}
else{
return monthString(month) + " " + day +" , " + year;
}
}
public static String monthString(int mont)
{
if (month >= 1 && month <= 12)
{
String[] stringMonth = {"", "January" , "February" , "March" , "April" , "May" , "June" , "July" , "August" , "September" , "October" , "November" , "December"};
return stringMonth[month];
}
else{
throw new IllegalArgumentException();
}
}
}
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