Specify and Design a class for an abstract data type that models a day of the ye

Question

Specify and Design a class for an abstract data type that models a day of the year. (note that the actual code to implement the class is not needed)
The Date object should store three int values with the month between 1 and 12, day between 1 and 31 (Or, for SOME months, 28, 29, or 30), and year between 0 and 2100. Provide AT LEAST the following:

• default constructor should set dat to Jan 1, 2000

• constructor with three ints (M, D, Y)

• constructor with string and 2 ints - Month (as “January”) should be converted to an integer, and the day and the year from the 2 ints

• three accessors for the three data items

• displayMonth returns the Month as a String

• displayDate returns the entire Date as a string, using displayMonth for the month

• compareDates returns -1 if the Date object it’s applied to comes before the argument Date, 0 if the two dates are equal, and +1 if the Date object is after the argument Date

• validMonth returns true is the value is a valid month

Explanation / Answer

This is a simple possibility (sorry I wrote in code, it's just easier for me to express): abstract class Date {
   //fields
   private int day, month, year;

   //constructors
   //default constructor
   public Date() {
       this.day = 1;
       this.month = 1;
       this.year = 2000;
   }
   //with all int values
   public Date(int d, int m, int y) {
       this.day = d;
       this.month = m;
       this.year = y;
   }
   //with month string value
   public Date(int d, String m, int y) {
       this.day = d;
       this.year = y;

       if(m.compareToIgnoreCase("january") == 0) {
           this.month = 1;
       }
       else if (m.compareToIgnoreCase("february") == 0) {
           this.month = 2;
       }
       else if (m.compareToIgnoreCase("march") == 0) {
           this.month = 3;
       }
       else if (m.compareToIgnoreCase("april") == 0) {
           this.month = 4;
       }
       else if (m.compareToIgnoreCase("may") == 0) {
           this.month = 5;
       }
       else if (m.compareToIgnoreCase("june") == 0) {
           this.month = 6;
       }
       else if (m.compareToIgnoreCase("july") == 0) {
           this.month = 7;
       }
       else if (m.compareToIgnoreCase("august") == 0) {
           this.month = 8;
       }
       else if (m.compareToIgnoreCase("september") == 0) {
           this.month = 9;
       }
       else if (m.compareToIgnoreCase("october") == 0) {
           this.month = 10;
       }
       else if (m.compareToIgnoreCase("november") == 0) {
           this.month = 11;
       }
       else if (m.compareToIgnoreCase("december") == 0) {
           this.month = 12;
       }
       else { // invalid month entered
           this.month = -1;
       }
   }
   //end of constructors

   //accessors for day month and year
   public void setDay(int d) {
       this.day = d;
   }
   public int getDay() {
       return this.day;
   }
   public void setMonth(int m) {
           this.month = m;
       }
       public int getMonth() {
           return this.month;
   }
   public void setYear(int y) {
           this.year = y;
       }
       public int getYear() {
           return this.year;
   }
   //end of accessors

   public String displayMonth(){
       switch(this.month) {
           case 1:
               return "January";
               break;
           case 2:
               return "February";
               break;
           case 3:
               return "March";
               break;
           case 4:
               return "April";
               break;
           case 5:
               return "May";
               break;
           case 6:
               return "June";
               break;
           case 7:
               return "July";
               break;
           case 8:
               return "August";
               break;
           case 9:
               return "September";
               break;
           case 10:
               return "October";
               break;
           case 11:
               return "November";
               break;
           case 12:
               return "December";
               break;
           default:
               return "Unknown";
               break;
       }
   } // end of displayMonth

   //display date as " month_string day year "
   public String displayDate () {
       String fullDate = this.displayMonth() + " " + this.day + " " + this.year;         return fullDate;
   }

   //compareDates
   public int compareDates (Date date){
       //we could keep if-elsing forever here or pick a shortcut: use String comparison for "y-m-d"
       // the compareTo() method compares the 2 strings lexicographically and returns -1, 0 or 1 with
       // the same conditions
       String thisDate = this.year + "-" + this.month + "-" + this.day;
       String argDate = date.year + "-" + date.month + "-" + date.day;

       return thisDate.compareTo(argDate);
   }

   //validMonth int between 1 and 12
   public Boolean validMonth(int m){
       if ((m > 0) && (m < 13))
           return true;
       else
           return false;
   }

   //other methods to implement on concrete classes
   abstract void method1();
   abstract Object method2();


} // end of abs class Day you could do the month string work more elegantly with an enum, like this: public enum textMonth {
        JANUARY, FEBRUARY, MARCH, APRIL,
        MAY, JUNE, JULY, AUGUST, SEPTEMBER,
        OCTOBER, NOVEMBER, DECEMBER
} abstract class Date {
   //fields
   private int day, month, year;

   //constructors
   //default constructor
   public Date() {
       this.day = 1;
       this.month = 1;
       this.year = 2000;
   }
   //with all int values
   public Date(int d, int m, int y) {
       this.day = d;
       this.month = m;
       this.year = y;
   }
   //with month string value
   public Date(int d, String m, int y) {
       this.day = d;
       this.year = y;

       if(m.compareToIgnoreCase("january") == 0) {
           this.month = 1;
       }
       else if (m.compareToIgnoreCase("february") == 0) {
           this.month = 2;
       }
       else if (m.compareToIgnoreCase("march") == 0) {
           this.month = 3;
       }
       else if (m.compareToIgnoreCase("april") == 0) {
           this.month = 4;
       }
       else if (m.compareToIgnoreCase("may") == 0) {
           this.month = 5;
       }
       else if (m.compareToIgnoreCase("june") == 0) {
           this.month = 6;
       }
       else if (m.compareToIgnoreCase("july") == 0) {
           this.month = 7;
       }
       else if (m.compareToIgnoreCase("august") == 0) {
           this.month = 8;
       }
       else if (m.compareToIgnoreCase("september") == 0) {
           this.month = 9;
       }
       else if (m.compareToIgnoreCase("october") == 0) {
           this.month = 10;
       }
       else if (m.compareToIgnoreCase("november") == 0) {
           this.month = 11;
       }
       else if (m.compareToIgnoreCase("december") == 0) {
           this.month = 12;
       }
       else { // invalid month entered
           this.month = -1;
       }
   }
   //end of constructors

   //accessors for day month and year
   public void setDay(int d) {
       this.day = d;
   }
   public int getDay() {
       return this.day;
   }
   public void setMonth(int m) {
           this.month = m;
       }
       public int getMonth() {
           return this.month;
   }
   public void setYear(int y) {
           this.year = y;
       }
       public int getYear() {
           return this.year;
   }
   //end of accessors

   public String displayMonth(){
       switch(this.month) {
           case 1:
               return "January";
               break;
           case 2:
               return "February";
               break;
           case 3:
               return "March";
               break;
           case 4:
               return "April";
               break;
           case 5:
               return "May";
               break;
           case 6:
               return "June";
               break;
           case 7:
               return "July";
               break;
           case 8:
               return "August";
               break;
           case 9:
               return "September";
               break;
           case 10:
               return "October";
               break;
           case 11:
               return "November";
               break;
           case 12:
               return "December";
               break;
           default:
               return "Unknown";
               break;
       }
   } // end of displayMonth

   //display date as " month_string day year "
   public String displayDate () {
       String fullDate = this.displayMonth() + " " + this.day + " " + this.year;         return fullDate;
   }

   //compareDates
   public int compareDates (Date date){
       //we could keep if-elsing forever here or pick a shortcut: use String comparison for "y-m-d"
       // the compareTo() method compares the 2 strings lexicographically and returns -1, 0 or 1 with
       // the same conditions
       String thisDate = this.year + "-" + this.month + "-" + this.day;
       String argDate = date.year + "-" + date.month + "-" + date.day;

       return thisDate.compareTo(argDate);
   }

   //validMonth int between 1 and 12
   public Boolean validMonth(int m){
       if ((m > 0) && (m < 13))
           return true;
       else
           return false;
   }

   //other methods to implement on concrete classes
   abstract void method1();
   abstract Object method2();


} // end of abs class Day you could do the month string work more elegantly with an enum, like this: public enum textMonth {
        JANUARY, FEBRUARY, MARCH, APRIL,
        MAY, JUNE, JULY, AUGUST, SEPTEMBER,
        OCTOBER, NOVEMBER, DECEMBER
} public enum textMonth {
        JANUARY, FEBRUARY, MARCH, APRIL,
        MAY, JUNE, JULY, AUGUST, SEPTEMBER,
        OCTOBER, NOVEMBER, DECEMBER
}

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