a) Output the date in multiple formats, such as
i) MM/DD/YYYY
ii) February 25, 2011
iii) DDD YYYY
I'm supposed to do this: b) Use overloaded constructors to create Date3 objects initialized with dates of the formats in part (a). In the first case, the constructor should receive three integer values. In the second case it should receive a String and two integer values. In the third case it should receive two integer values, the first of which represents the day number in the year. [Hint: to convert the String representation of the month to a numeric value, compare Strings using the equals method. For example, if s1 and s2 are Strings, the method call s1.equal(s2) returns true if the Strings are identical and otherwise returns false.
// Date3.java
// Date3 class declaration.
public class Date3
{
private int month; // 1-12
private int day; // 1-31 based on month
private int year; // any year
private String[] months = new String[]{ "january", "february", "march", "april", "may", "june", "july", "august", "september", "october", "november", "december" };
// constructor: call checkMonth to confirm proper value for month;
// call checkDay to confirm proper value for day
public Date3( int theMonth, int theDay, int theYear )
{
month = checkMonth( theMonth ); // validate month
year = theYear; // could validate year
day = checkDay( theDay ); // validate day
System.out.printf(
"Date3 object constructor for date %s\n", this );
} // end Date3 constructor
public Date3( String m, int d, int y){
this(m, d, y);
}
public Date3( int m, int y){
this(m,0, y);
}
// utility method to confirm proper month value
private int checkMonth( int testMonth )
{
if ( testMonth > 0 && testMonth <= 12 ) // validate month
return testMonth;
else // month is invalid
{
System.out.printf(
"Invalid month (%d) set to 1.", testMonth );
return 1; // maintain object in consistent state
} // end else
} // end method checkMonth
// utility method to confirm proper day value based on month and year
private int checkDay( int testDay )
{
int[] daysPerMonth =
{ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
// check if day in range for month
if ( testDay > 0 && testDay <= daysPerMonth[ month ] )
return testDay;
// check for leap year
if ( month == 2 && testDay == 29 && ( year % 400 == 0 ||
( year % 4 == 0 && year % 100 != 0 ) ) )
return testDay;
System.out.printf( "Invalid day (%d) set to 1.", testDay );
return 1; // maintain object in consistent state
} // end method checkDay
public String getMonthString(int month){
return months[month];
}
/* public String monthAsString()
{
//returns month as a string rather than an integer
switch (month)
{
case 1: return "January";
case 2: return "February";
case 3: return "March";
case 4: return "April";
case 5: return "May";
case 6: return "June";
case 7: return "July";
case 8: return "August";
case 9: return "September";
case 10: return "October";
case 11: return "November";
case 12: return "December";
default: return "";
}
}*/
// return a String of the form month/day/year
public String toString()
{
return String.format( "%d/%d/%d", month, day, year );
} // end method toString
} // end class Date3public class Date3Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Date3 myDate = new Date3(9, 16, 2011);
Date3 myDate2 = new Date3("June", 24, 2010);
Date3 myDate3 = new Date3(259, 2005);
// all three dates above are equal and will therefore print
// the same dates
System.out.println(myDate);
System.out.println(myDate2);
System.out.println(myDate3);
}
}
