Question

1. Complete the SpeedDating Class

Write the method bodies for the 2 SpeedDating methods. Study the method declarations and Javadoc comments so that you understand what each method is supposed to do.

To receive credit for a method, it must use one of the Java loops (your choice). Nested loops are not necessary.

1. Write a Test Class for Your SpeedDating Class

Your test class will have a main method that does the following:

1. Create a SpeedDating object

2. Since 1971, Columbus Day has been fixed by law in the USA as the second Monday in October. Prompt the user to enter a year, call the discoverColumbusDay method, and print the Date object returned. Print the Date, properly labeled, in the main method, not in SpeedDating.

3. Prompt the user to enter a day of the week as a String (e.g. Sunday, Monday, ..., Saturday). Call the auldLangSync method to get the next year in which New Year’s Day will fall on that day of the week. Print the year and the day of the week, properly labeled, in your main method and not in auldLangSync.

1. Using The Date Class - Examples

The Date class is a class for manipulating dates. A Date object represents a date in the Gregorian calendar (i.e., dates after October 15, 1582). Any attempt to create an invalid date will throw an exception.

Creating Objects

Date d1 = new Date(month, day, year) ;   // initializes Date object d1 to int arguments month, day, and year.

// e.g.,

Date d1 = new Date(3,19,2020); // initializes d1 to March 19th, 2020

d1 = new Date(1,1,2021) ;     // d1 is now January 1, 2021

Accessor Methods

d1.getMonth()       // returns the month as int 1..12

d1.getDay()        // returns the day of the month, as an int

d1.getYear()     // returns the year

d1.getMonthName() // returns the month as a String (e.g. “March") d1.getDayOfWeek() // returns the day of the week as a string (e.g. // “Friday”)

d1.equals(d2)     // returns true if d1 is the same date as d2 // otherwise, returns false

d1.getShortDate() // returns the date as mm/dd/yyyy (e.g. 3/19/2020)

d1.getMediumDate() // returns the date in the form of “March 19, 2020”

d1.getLongDate() // returns the date in the form of // “Thursday, March 19th, 2020”

Mutator Methods

Date d = new Date(1,1,2020) ; // d is January 1, 2020 (a leap year)

d.next() ;                     // d is January 2, 2020

d.previous() ;                 // d is January 1, 2020

d.add(31) ;                 // d is February 1, 2020

d.subtract(32) ;              // d is December 31, 2019

d.next() ;                    // d is January 1, 2020

d = new Date(3,1,2020) ;     // d is March 1, 2020

d.previous() ;                 // d is now February 29, 2020

public class SpeedDating
 {
    // Note: this class has no instance variables!
        
    /**
     * Create a SpeedDating object
     */
     public SpeedDating()
     {}    
     // Note: The constructor takes no parameters.  This is known as
     // a "default" constructor.  This one also happens to have an empty body,
     // but that is not true for all default constructors
     
    /**
     * Computes and returns the Date of Columbus Day in the USA - the second
     * Monday in October - for a given year   
     * @param year the year for which to compute Columbus Day
     * @return the Date of Columbus Day for the given year
     */
     public Date discoverColumbusDay(int year)
     {
        // bogus return value so program skeleton will compile and run - 
        // replace it with the correct Date and delete this comment
        return null ;
     }
                
     /**
      * Computes and returns the next year - beginning with 2021 - in which
      * New Year's Day will fall on a specified day of the week
      * @param dayOfWeek the day of the week 
      * @return the year in which New Year's Day will fall on dayOfWeek
      */
      public int auldLangSynch(String dayOfWeek) 
      {
        // bogus return value so program skeleton will compile and run - 
        // replace it with the correct number and delete this comment
        return -999 ;
      }
 }

Answer 1

The given statements in the question appear incomplete but you can use following method to calculate Columbus day of the given input year by the user.

 public class SpeedDating { 

 public static void main(String[] args) {   int nYear;

     Scanner scanner = new Scanner(System.in);

     System.out.print("Enter year for which Columbus day needs to be calculated: ");

     nYear = scanner.nextInt();

 public Date discoverColumbusDay(int nYear)

      { 

     int nX;

     int nMonth = 9; // October, because it is on the second Monday of the month October.

     Date dtD;

     dtD = new Date(nYear, nMonth, 1);

     nX = dtD.getDay();

     switch(nX)

         {

         case 0 : // Sunday

         return new Date(nYear, nMonth, 9);

         case 1 : // Monday

         return new Date(nYear, nMonth, 15);

         case 2 : // Tuesday

         return new Date(nYear, nMonth, 14);

         case 3 : // Wednesday

         return new Date(nYear, nMonth, 13);

         case 4 : // Thursday

         return new Date(nYear, nMonth, 12);

         case 5 : // Friday

         return new Date(nYear, nMonth, 11);

         default : // Saturday

         return new Date(nYear, nMonth, 10);

         }

System.out.print("Date in which Columbus day will fall is",+dtD);

}

}

}