Question

Create class Date with the following capabilities:
a) Output the date in multiple formats, such as
MM/DD/YYYY
June 14, 1992
DDD YYYY
b) Use overloaded constructors to create Date 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.equals(s2)

Java language ( Introduction to Java)

Answer 1

//Java program

class Date{
   private int day,month,year;
   public Date(int m,int d, int y) {
       day = d;
       month = m;
       year =y;
   }
   public Date(String m ,int d, int y) {
       day = d;
       year = y;
       if(m.equals("January"))month=1;
       else if(m.equals("February"))month=2;
       else if(m.equals("March"))month=3;
       else if(m.equals("April"))month=4;
       else if(m.equals("May"))month=5;
       else if(m.equals("June"))month=6;
       else if(m.equals("July"))month=7;
       else if(m.equals("August"))month=8;
       else if(m.equals("September"))month=9;
       else if(m.equals("October"))month=10;
       else if(m.equals("November"))month=11;
       else if(m.equals("December"))month=12;
   }
   public Date(int days , int y) {
       int months[] = {31,28,31,30,31,30,31,31,30,31,30,31};
       if (y % 400 == 0 || (y % 4 == 0 && y % 100 != 0))months[1]+=1;
       int m=1;
       while(days>months[m-1]) {
           days-=months[m-1];
           m++;
       }
       day=days;
       month = m;
       year = y;
   }
   public void printDate() {
       System.out.printf("%2d/%2d/%4d\n",day,month,year);
   }
}
public class MainDate {
   public static void main(String args[]) {
       Date d1 = new Date(10,2,2018);
       Date d2 = new Date("April" ,4,2018 );
       Date d3 = new Date(89 , 2018);
      
       d1.printDate();
       d2.printDate();
       d3.printDate();
   }
}
//sample output