Answer:
import javax.swing.JOptionPane;
public class BadDate {
private static final int MINIMUM_YEAR = 0, MINIMUM_MONTH = 1, MAXIMUM_MONTH = 12, MINIMUM_DAY = 1, MAXIMUM_DAY = 31;
private int year = 0;
private int month = 0;
private int day = 0;
public void housekeeping() {
String yearData = JOptionPane.showInputDialog("Enter year");
String monthData = JOptionPane.showInputDialog("Enter month");
String dayData = JOptionPane.showInputDialog("Enter day");
this.year = Integer.parseInt(yearData);
this.month = Integer.parseInt(monthData);
this.day = Integer.parseInt(dayData);
}
public boolean isLeapYear(){
if(((this.year % 400) == 0) || (((this.year % 4) == 0) && ((this.year % 100) != 0)))
return true;
else
return false;
}
public void endOfJob() {
boolean validDate = true;
if((month < MINIMUM_MONTH) || (MAXIMUM_MONTH < month))
validDate = false;
else {
if(((month == 1) || (month == 3) || (month == 5) || (month == 7) ||
(month == 8) || (month == 10) || (month == 12)) && ((day < 1) || (31 < day)))
validDate = false;
else if(((month == 4) || (month == 6) || (month == 9) || (month == 11)) && ((day < MINIMUM_DAY) || (30 < day)))
validDate = false;
else if(month == 2) {
if(isLeapYear() && ((day < MINIMUM_DAY) || (29 < day)))
validDate = false;
else if((day < MINIMUM_DAY) || (28 < day))
validDate = false;
}
}
if (validDate) {
JOptionPane.showMessageDialog(null, "Date: " + this.month + "/" + this.day + "/" + this.year);
System.out.println(this.month + "/" + this.day + "/" + this.year + " is a valid date");
} else {
JOptionPane.showMessageDialog(null, this.month + "/" + this.day + "/" + this.year + " is an invalid date");
System.out.println(this.month + "/" + this.day + "/" + this.year + " is an invalid date");
}
}
public static void main(String args[]) {
BadDate date = new BadDate();
date.housekeeping();
date.endOfJob();
}
}
Explanation:
- Take the year, month and day from user as an input.
- Check if the year of this date is a leap year inside the isLeapYear method.
- Inside the housekeeping method
, take the year, the month and day to ensure that date is valid
.
- Display positive response by printing valid date if date is correct.
- Otherwise alert user that an invalid date was entered.
