Question

The Java class called Holiday is started below. An object of class Holiday represents a holiday during the year. This class has three instance variables:

• name, which is a String representing the name of the holiday
• day, which is an int representing the day of the month of the holiday
• month, which is a String representing the month the holiday is in

public class Holiday {

private String name;

private int day;

private String month;

// your code goes here

}

1. Write a first constructor for the class Holiday, which takes a String representing the name and sets the attribute name to this value.
2. Write a second constructor for the class Holiday, which takes a String representing the name, an int representing the day, and a String representing the month as its arguments, and sets the instance variables to these values. This constructor should call the constructor of question A)
3. Write a mutator/Accessors to all data attributes
4. Write a method isSameMonth, which compares two instances of the class Holiday, and returns the Boolean value true if they have the same month, and false if they do not.
5. Write a method SameHolidayDate, which compares two instances of the class Holiday, and returns the Boolean value true if they have the same day, month, and false if they do not.

In a new class HolidayDemo with main method:

1. Write a piece of code that creates a Holiday instance H1 with the name “Independence Day”, with the day “4”, and with the month “July”.
2. Write a piece of code that creates a Holiday instance H2 with the name “Fourth of July”, with the day “4”, and with the month “July”.
3. Check if H1 and H2 are reflecting the same holiday.
4. Change the name, day and month of H2 to “christmas”, “12” and “December”
5. Check if H1 and H2 fall in the same month.
6. Write a piece of code that creates a Holiday instance H3 with the name “New Year’s Eve”, with the day “31”, and with the month “December”.
7. Check if H2 and H3 fall in the same month.

Answer 1

Program: In this program, we create a class Holiday in which we have three instance variables, two constructors , mutator/accessor methods and two boolean methods to check for same month and same holiday date. We have another class (driver class) HolidayTest in which we create the main() method and create objects of the class Holiday and test our methods.

Holiday.java:

Code:

public class Holiday {

    private String name;

    private int day;

    private String month;


    public Holiday(String name) {
        this.name = name;
    }

    public Holiday(String name, int day, String month) {
        this.name = name;
        this.day = day;
        this.month = month;
    }

    //Mutators and accessors
    //Set name
    public void setName(String name) {
        this.name = name;
    }

    //Get name
    public String getName() {
        return name;
    }

    //Set day
    public void setDay(int day) {
        this.day = day;
    }

    //Get day
    public int getDay() {
        return day;
    }

    //Set name
    public void setMonth(String month) {
        this.month = month;
    }

    //Get name
    public String getMonth() {
        return month;
    }

    //Check for same month
    public boolean isSameMonth(Object obj) {
        // check for if it the same reference
        if (this == obj) return true;

        // check if it is not instance of this class
        if (!(obj instanceof Holiday)) return false;

        // cast the compared object to Holiday class
        Holiday other = (Holiday) obj;

        //Return true if month is same
        return this.month.equals(other.month);
    }

    //Check for same holiday date
    public boolean SameHolidayDate(Object obj) {
        // check for if it the same reference
        if (this == obj) return true;

        // check if it is not instance of this class
        if (!(obj instanceof Holiday)) return false;

        // cast the compared object to Holiday class
        Holiday other = (Holiday) obj;

        //Return true if month and day are same
        return this.month.equals(other.month) && this.day == other.day;
    }
}

HolidayDemo.java:

Code:

public class HolidayDemo {
    public static void main(String[] args) {

        //Create new objects
        Holiday H1 = new Holiday("Independence Day", 4, "July");
        Holiday H2 = new Holiday("Fourth of July", 4, "July");

        //Check if they are the same holidays
        if (H2.SameHolidayDate(H1)) {
            System.out.print(H1.getName() + " and " + H2.getName() + " are ");
            System.out.println("same holidays");
        } else {
            System.out.print(H1.getName() + " and " + H2.getName() + " are ");
            System.out.println("different holidays");
        }

        //Set name, day and month
        H2.setName("Christmas");
        H2.setDay(12);
        H2.setMonth("December");

        //Check if they have same month
        if (H2.isSameMonth(H1)) {
            System.out.print(H1.getName() + " and " + H2.getName() + " fall in ");
            System.out.println("same month");
        } else {
            System.out.print(H1.getName() + " and " + H2.getName() + " fall in ");
            System.out.println("different months");
        }

        //Create new object
        Holiday H3 = new Holiday("New Year's Eve", 31, "December");
        //Check if they have same month
        if (H3.isSameMonth(H2)) {
            System.out.print(H2.getName() + " and " + H3.getName() + " fall in ");
            System.out.println("same month");
        } else {
            System.out.print(H2.getName() + " and " + H3.getName() + " fall in ");
            System.out.println("different months");
        }
    }
}

Output:

Note: In the main method() we have tried to make our output more informational, rather than just returning true or false.If we just need true and false values we can simply print the method calls:

HolidayTest.java:

Code:

public class HolidayDemo {
    public static void main(String[] args) {

        //Create new objects
        Holiday H1 = new Holiday("Independence Day", 4, "July");
        Holiday H2 = new Holiday("Fourth of July", 4, "July");

        //Check if they are the same holidays
        System.out.println(H1.SameHolidayDate(H2));
        //Set name, day and month
        H2.setName("Christmas");
        H2.setDay(12);
        H2.setMonth("December");

        //Check if they have same month
        System.out.println(H1.isSameMonth(H2));

        //Create new object
        Holiday H3 = new Holiday("New Year's Eve", 31, "December");
        //Check if they have same month
        System.out.println(H2.isSameMonth(H3));
    }
}

Output: