Question

Create an abstract class “Appointment” that represents an event on a calendar. The “Appointment” class will have four instance variables: • An instance variable called “year” which will be of type int • An instance variable called “month” which will be of type int • An instance variable called “day” which will be of type int • An instance variable called “description” which will be of type String The “Appointment” class must also implement the following methods: • A getter and setter for each of the four instance variables • An abstract method named occursOn which returns a boolean and takes three parameters of type int: aYear, aMonth, aDay • Overrides the toString method from the Object superclass which returns the String: "Appointment: aDescription On Date: 1/1/1969" where, “aDescription” is the value stored in the description instance variable and “1/1/1969” are the values stored in the month, day, and year instance variables respectively. • Overrides the equals method from the Object superclass which takes a single parameter of type “Object” and returns true if the given objects is an “Appointment” object and it’s year, month, and day instance variables are equal to the current objects instance variables. If the given parameter is null, equals should return false. Create a class “Onetime” which subclasses the “Appointment” class. The “Onetime” class will define no new instance variables. Write a parameterized constructor which takes three parameters of type int: aYear, aMonth, aDay. The parameterized constructor sets the “year”, “month”, and “day” instance variables defined in the “Appointment” class to the values passed as parameters. The parameterized constructor should set the “description” instance variable to an empty String. ("") The “Onetime” class must also implement the following methods: • It must implement the abstract method “occursOn” defined in the “Appointment” class. “occuresOn” should return true if the given parameters match the year, month, and day instance variables for the object. Otherwise it should return false. Create a class “Yearly” which subclasses the “Appointment” class. The “Yearly” class will define no new instance variables. Write a parameterized constructor which takes two parameters of type int: aMonth and aDay. The parameterized constructor sets the “month” and “day” instance variables defined in the “Appointment” class to the values passed as parameters. The parameterized constructor should set the “description” instance variable to an empty String. ("") The “Yearly” class must also implement the following methods: • It must implement the abstract method “occursOn” defined in the “Appointment” class. “occuresOn” should return true if the given parameters match the month and day instance variables for the object. (We can ignore the aYear parameter because this event repeats yearly so every value is correct) Otherwise it should return false. • Overrides the toString method from the Object superclass which returns the String: "Appointment: aDescription Every Year On 1/1" where, “aDescription” is the value stored in the description instance variable and “1/1” are the values stored in the month and day instance variables respectively. Create a class “Monthly” which subclasses the “Appointment” class. The “Monthly” class will define no new instance variables. Write a parameterized constructor which takes one parameter of type int: aDay. The parameterized constructor sets the “day” instance variable defined in the “Appointment” class to the value passed as a parameter. The parameterized constructor should set the “description” instance variable to an empty String. ("") The “Monthly” class must also implement the following methods: • It must implement the abstract method “occursOn” defined in the “Appointment” class. “occuresOn” should return true if the given parameters match the day instance variable for the object. (We can ignore the aYear and aMonth parameters because this event repeats monthly so every value is correct) Otherwise it should return false. • Overrides the toString method from the Object superclass which returns the String: "Appointment: aDescription Every Month On 1" where, “aDescription” is the value stored in the description instance variable and “1” is the values stored in the day instance variable respectively.

Answer 1

//Appointment.Java

public abstract class Appointment {
    private int year,month,day;
    private String description;
//Getters
    public void setDescription(String description) {
        this.description = description;
    }

    public void setYear(int year) {
        this.year = year;
    }

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

    public void setMonth(int month) {
        this.month = month;
    }
//Setters
    public int getYear() {
        return year;
    }

    public String getDescription() {
        return description;
    }

    public int getMonth() {
        return month;
    }

    public int getDay() {
        return day;
    }
    //abstract method
    public abstract boolean occursOn(int aYear,int aMonth,int aDay);

    @Override
    public String toString() {
        return description+" "+ month+"/"+day+"/"+year;
    }

    @Override
    public boolean equals(Object obj) {
        // If the object is compared with itself then return true
        if(obj ==this)
            return  true;
        /* Check if o is an instance of Appointment or not
          "null instanceof [type]" also returns false */
        if(!(obj instanceof Appointment))
            return false;
        //typecast obj to Appointment so that we can compare data members
        Appointment appointment = (Appointment)obj;
        //Compare the data members and return accordingly
        return Integer.compare(month,appointment.month)==0
                && Integer.compare(day,appointment.day)==0
                && Integer.compare(year,appointment.year)==0;
    }
}

//OneTime.Java

public class OneTime extends Appointment {

public OneTime(int aYear,int aMonth,int aDay){
   setDay(aDay);
   setMonth(aMonth);
   setYear(aYear);
   setDescription("");
}
    @Override
    public boolean occursOn(int aYear, int aMonth, int aDay) {
    if(getDay()==aDay && getMonth()==aMonth )
        return true;
    else
        return false;
    }

    @Override
    public String toString() {
        return "Appointment: "+getDescription()+" Every year on "+getMonth()+"/"+getDay();
    }
}

//Monthly.Java

public class Monthly extends Appointment {
    public Monthly(int aDay)
    {
        setDay(aDay);
        setDescription("");
    }

    @Override
    public boolean occursOn(int aYear, int aMonth, int aDay) {
        if(aDay==getDay())
            return true;
        else
        return false;
    }

    @Override
    public String toString() {
        return "Appointment: "+ getDescription()+" Every month on "+getDay();
    }
}

//Main.java

public class Main {

    public static void main(String[] args) {
   // write your code here
        Appointment oneTime= new OneTime(2018,10,02);
      Appointment monthly = new Monthly(4);
        System.out.println(oneTime);
        System.out.println(monthly);

    }
}

//Output

"C:\Program Files\Javaljdk1.8.0 92 binljava"... Appointment: Every year on 10/2 Appointment: Every month on 4 : Every year on 10/2 Process finished with exit code 0

//If you need any help regarding this question please leave a comment........... thanks