Write a Java program in response to the following prompt Design and implement th

Question

Write a Java program in response to the following prompt

Design and implement the class Day that implements the day of the week in a program. The class Day should store the day, such as Sun for Sunday. The program should be able to perform the following operations on an object of type Day:

A. Set the day.

B. Print the day.

C. Return the day.

D. Return the next day.

E. Return the previous day.

F. Calculate and return the day by adding certain days to the current day. For example, if the current day is Monday and we add four days, the day to be returned is Friday. Similarly, if today is Tuesday and we add 13 days, the day to be returned is Monday.

G. Add the appropriate constructors.

H. Write the definitions of the methods to implement the operations for the class Day, as defined in A through G.

I. Write a program to test various operations on the class Day.

Explanation / Answer

Day.java

public class Day {

    // Constants used to easily identify the days and their

integer equivalents
    public static final int SUNDAY = 0;
    public static final int MONDAY = 1;
    public static final int TUESDAY = 2;
    public static final int WEDNESDAY = 3;
    public static final int THURSDAY = 4;
    public static final int FRIDAY = 5;
    public static final int SATURDAY = 6;
    private static final int DAYS_IN_WEEK = 7;
  
    private int dayInt;         // Stores the current day as

an int
    private String dayString;   // Stores the current day as a

String value

    // Default constructor, Calls setDay and sets the day to

Sunday (0)
    public Day()
    {
        setDay(SUNDAY);
    }

    // Constructor that takes an int parameter that is passed

to setDay
    public Day(int day)
    {
        setDay(day);
    }

    // Sets the dayInt value and dayString value
    public final void setDay(int day)
    {
        this.dayInt = day;
        this.dayString = convertDayToString(day);
    }

    // Returns the current value of dayInt as integer
    public int getDay()
    {
        return dayInt;
    }

    // Returns the String value of dayString (replaces print

method)
    @Override
    public String toString()
    {
        return dayString;
    }

    // Returns a String of the next day after the current day
    public String nextDay()
    {
        return calcDaysFrom(1);
    }

    // Returns a String of the previous day before the current

day
    public String prevDay()
    {
        return calcDaysFrom(-1);
    }

    // Returns a String of the day X number of days after the

current day
    public String calcDaysFrom(int numberOfDays)
    {
        int tempDay;

        tempDay = (numberOfDays % DAYS_IN_WEEK) + this.dayInt;
        tempDay = tempDay % DAYS_IN_WEEK;

        return convertDayToString(tempDay);
    }

    // Takes an integer from 0 - 6 and returns its day of week

String value
    private String convertDayToString(int day)
    {
        String tempDayString;

        switch (day)
        {
            case SUNDAY:
                tempDayString = "Sunday";
                break;
            case MONDAY:
                tempDayString = "Monday";
                break;
            case TUESDAY:
                tempDayString = "Tuesday";
                break;
            case WEDNESDAY:
                tempDayString = "Wednesday";
                break;
            case THURSDAY:
                tempDayString = "Thursday";
                break;
            case FRIDAY:
                tempDayString = "Friday";
                break;
            case SATURDAY:
                tempDayString = "Saturday";
                break;
            default:
                tempDayString = "Sunday"; // default to Sunday
                break;
        }

        return tempDayString;
    }
}

DayTestProgram.java

public class DayTestProgram
{

    public static void main(String[] args)
    {
        // Create the Day objects
        Day testDayDefault = new Day();
        Day testDay = new Day(Day.SATURDAY);

        // Test the toString method (toString takes place of

print method)
        System.out.println("Day with default constructor is "
                + testDayDefault.toString());

        System.out.println("Day constructor with Day.SATURDAY

(6) as "
                + "parameter is " + testDay.toString());

        // Test setDay method
        testDay.setDay(Day.THURSDAY);
        System.out.println("setDay with Day.THURSDAY (4) as

parameter is "
                + testDay.toString());

        // Test the calcDaysFrom method
        for (int i = 0; i <= 10; i++)
        {
            System.out.println(i + " days from " +

testDay.toString() + " is a "
                    + testDay.calcDaysFrom(i));
        }

        for (int i = 0; i >= -10; i--)
        {
            System.out.println(i + " days from " +

testDay.toString() + " is a "
                    + testDay.calcDaysFrom(i));
        }

        // Test the nextDay and prevDay method
        System.out.println("Day after " + testDay.toString() +

" is "
                + testDay.nextDay());
        System.out.println("Day before " + testDay.toString()

+ " is "
                + testDay.prevDay());   

        // Test the getDay method
        System.out.println("The integer value of " +

testDay.toString() +
                " is " + testDay.getDay());

    }
}

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.