I want to fix the date to month/day/year in my class (Gregorian Calendar) so it works with my tester program. I get errors when running my tester program, I think it has to do with my string toString() method but I have tried to fix it but keep getting errors. I do not understand how having my string output to month + day + year would not work correctly in outputting mmmm/dd/yyyy. Thank you for your help.
Errors:
Exception in thread "main" java.lang.IllegalArgumentException
at Date.<init>(Date.java:15)
at Assign8B.main(Assign8B.java:14)
Class
public class Date {
private int day, month, year;
public Date() {
this.day = 1;
this.month = 1;
this.year = 1970;
}
public Date(int year, int month, int day) {
if (year < 1582) {
throw new IllegalArgumentException();
} else if (month <= 0 && month > 12) {
throw new IllegalArgumentException();
} else if (!isLeapYear(year) && (month == 2 && day == 29)) {
throw new IllegalArgumentException();
} else {
this.day = day;
this.month = month;
this.year = year;
}
}
public void addDays(int days) {
int[] daysOfMonth = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int step = 1;
if(days < 0)
step = -1;
if(isLeapYear(year))
daysOfMonth[1] = 29;
int d = 0;
while(d < days){
d++;
day += step;
if(day > daysOfMonth[month-1]){
day = 1;
month++;
if(month > 12){
year++;
month = 1;
if(isLeapYear(year))
daysOfMonth[1] = 29;
else
daysOfMonth[1] = 28;
}
}
else if(day < 1) {
month--;
if(month == 0) {
month = 12;
year--;
if(isLeapYear(year))
daysOfMonth[1] = 29;
else
daysOfMonth[1] = 28;
}
day = daysOfMonth[month-1];
}
}
}
public void addWeeks(int weeks) {
addDays(weeks * 7);
}
public int getDay() {
return day;
}
public void setDay(int day) {
this.day = day;
}
public int getMonth() {
return month;
}
public void setMonth(int month) {
this.month = month;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public boolean isLeapYear() {
return isLeapYear(this.year);
}
public boolean isLeapYear(int year) {
return(year % 400 == 0 || (year % 4 == 0 && year % 100 != 0));
}
public int daysTo(Date other) {
int days = 0;
int d1, m1, y1, d2, m2, y2;
int sign = 1;
if(this.toString().compareTo(other.toString()) > 0){
d1 = other.day;
m1 = other.month;
y1 = other.year;
d2 = day;
m2 = month;
y2 = year;
sign = -1;
} else {
d1 = day;
m1 = month;
y1 = year;
d2 = other.day;
m2 = other.month;
y2 = other.year;
}
int[] daysOfMonth = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
if(isLeapYear(y1))
daysOfMonth[1] = 29;
while(d1 != d2 || m1 != m2 || y1 != y2){
days++;
d1++;
if(d1 > daysOfMonth[m1-1]){
d1 = 1;
m1++;
if(m1 > 12){
y1++;
m1 = 1;
if(isLeapYear(y1))
daysOfMonth[1] = 29;
else
daysOfMonth[1] = 28;
}
}
}
days = days * sign;
return days;
}
public String longDate() {
String[] months = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
return months[month-1] + " " + day + ", " + year;
}
public String toString() {
String s = month + "/" + day + "/" + year;
return s;
}
public static int daysTo(Date one, Date two) {
return one.daysTo(two);
}
}
Tester Program
public class Assign8B {
// Part of the main method I'll use to test your class
// NO imports allowed from the JAVA API
public static void main(String[] a) {
Date one = new Date(10,15,1582); // start of Gregorian
Date two = new Date(1,28,2020); // 2020 is a leap year
one.addDays(1); // advance one day (negative subtracts days)
one.addWeeks(10); // advance one week (negative allowed, yes)
System.out.println(two.daysTo(one)); // -159645 days (negative)
System.out.println(one.getDay()); // day is now the 25th (advanced)
System.out.println(one.getMonth()); // returns 12, January is 1
System.out.println(one.getYear()); // still 1582 from start
System.out.println(one.isLeapYear()); // false for 1582
System.out.println(one.toString()); // style is 12/25/1582
try {
Date three = new Date(12,33,1956); // obviously illegal
Date four = new Date(2,29,2013); // illegal leap year
three.setDay(31); // fixes that day of month, OK
four.setMonth(3); // fixes the month, year still wrong
four.setYear(1929); // fixes the year, code not reached
} catch (IllegalArgumentException e) {
System.out.println("Illegal day attempted");
}
// Use UNIX zero of 01/01/70 for default, and create "longDate" output
// I thought a long date was dinner with a person you don't like?
Date five = new Date();
System.out.println(five.longDate()); // January 1, 1970
// Finally, let's understand what static methods are most commonly used for:
System.out.println(Date.daysTo(one, two)); // still 159645 days (positive)
}
}
