Question

Copy all the classes given in classes Calendar, Day, Month, & Year into BlueJ and then generate their documentation. Examine the documentation to see the logic used in creating each class.

(Code given below)

import java.util.ArrayList;
import java.util.Iterator;

class Calendar {
  private Year year;

  public Calendar() {
    year = new Year();
  }
  public void printCalendar() {
    year.printCalendar();
  }
}

class Year {
  private ArrayList<Month> months;
  private int number;

  public Year() {
    this(2013);
  }
  public Year(int number) {
    this.number = number;
    initializeMonths();
  }
  public Year(ArrayList<Month> months, int number) {
    this.months = months;
    this.number = number;
  }
  public void initializeMonths() {
    months = new ArrayList<Month>(12);

    months.add(new Month("January",   number));
    months.add(new Month("February",  number));
    months.add(new Month("March",     number));
    months.add(new Month("April",     number));
    months.add(new Month("May",       number));
    months.add(new Month("June",      number));
    months.add(new Month("July",      number));
    months.add(new Month("August",    number));
    months.add(new Month("September", number));
    months.add(new Month("October",   number));
    months.add(new Month("November",  number));
    months.add(new Month("December",  number));
  }
  public static boolean isLeapYear(int year) {
    if ( ((year % 4 == 0)  && (year % 100 != 0)) ||
         (year % 400 == 0) ) {
      return true;
    }
    return false;
  }
  public void printCalendar() {
    Month month;
    Iterator<Month> it = months.iterator();

    while (it.hasNext()) {
      month = it.next();
      month.printCalendar();
    }
  }
}

class Month {
  private ArrayList<Day> days;
  private String name;
  private int year;

  public Month() {
    days = new ArrayList<Day>();
    name = new String();
    year = 0;
  }
  public Month(String name, int year) {
    this.name = name;
    this.year = year;

    initializeDays();
  }
  public Month(ArrayList<Day> days, String name, int year) {
    this.days = days;
    this.name = name;
    this.year = year;
  }
  public int convertNameToNumber() {
    int nameToNumber = 1;

    if (name.equals("February")) {
      nameToNumber = 2;
    }
    else if (name.equals("March")) {
      nameToNumber = 3;
    }
    else if (name.equals("April")) {
      nameToNumber = 4;
    }
    else if (name.equals("May")) {
      nameToNumber = 5;
    }
    else if (name.equals("June")) {
      nameToNumber = 6;
    }
    else if (name.equals("July")) {
      nameToNumber = 7;
    }
    else if (name.equals("August")) {
      nameToNumber = 8;
    }
    else if (name.equals("September")) {
      nameToNumber = 9;
    }
    else if (name.equals("October")) {
      nameToNumber = 10;
    }
    else if (name.equals("November")) {
      nameToNumber = 11;
    }
    else if (name.equals("December")) {
      nameToNumber = 12;
    }

    return nameToNumber;
  }
  public int determineNumberOfDays() {
    int total;

    if ( name.equals("January") || name.equals("March")   ||
         name.equals("May")     || name.equals("July")    ||
         name.equals("August")  || name.equals("October") ||
         name.equals("December") ) {
      total = 31;
    }
    else if ( name.equals("April")     || name.equals("June") ||
              name.equals("September") || name.equals("November") ) {
      total = 30;
    }
    else {
      if (Year.isLeapYear(year)) {
        total = 29;
      }
      else {
        total = 28;
      }
    }
    return total;
  }
  public int determineNumberOfDays(int monthNumber) {
    if (monthNumber == 2) {
      if (Year.isLeapYear(year)) {
        return 29;
      }
      else {
        return 28;
      }
    }
    else if ( monthNumber == 4 || monthNumber == 6 || 
              monthNumber == 9 || monthNumber == 11 ) {
      return 30;
    }
    else {
      return 31;
    }
  }
  public int determineStartDayOffset() { 
 
    //get total number of days since 1/1/1800
    int i, monthNumber, startDayOffset, startDayOffset1800 = 3;
    long totalNumberOfDays = startDayOffset1800;

    for (i = 1800; i < year; i++) {
      if (Year.isLeapYear(i)) {
        totalNumberOfDays = totalNumberOfDays + 366;
      }
      else {
        totalNumberOfDays = totalNumberOfDays + 365;
      }
    }

    monthNumber = convertNameToNumber();
    for (i = 0; i < monthNumber; i++) {
      totalNumberOfDays = totalNumberOfDays + determineNumberOfDays(i + 1);
    }

    startDayOffset = (int) (totalNumberOfDays % 7);
    return startDayOffset;
  }
  public ArrayList<Day> getDays() {
    return days;
  }
  public String getName() {
    return name;
  }
  public void initializeDays() {
    int i, startDayOffset;
    int numberOfDays = determineNumberOfDays();
    String dayName = new String();

    days = new ArrayList<Day>(numberOfDays);
    startDayOffset = determineStartDayOffset();

    for (i = 0; i < numberOfDays; i++) {
      switch ((i + startDayOffset) % 7) {
        case 0:  dayName = "Sunday";
                 break;
        case 1:  dayName = "Monday";
                 break;
        case 2:  dayName = "Tuesday";
                 break;
        case 3:  dayName = "Wednesday";
                 break;
        case 4:  dayName = "Thursday";
                 break;
        case 5:  dayName = "Friday";
                 break;
        case 6:  dayName = "Saturday";
                 break;
        default: dayName = "Week Day";
      }

      days.add(new Day(dayName, (i + 1)));
    }
  }
  public void printCalendar() {
    int i, numberOfDays, startDayOffset;

    System.out.println();
    printTitle();

    numberOfDays = determineNumberOfDays();
    startDayOffset = determineStartDayOffset();

    for (i = 0; i < startDayOffset; i++) {
      System.out.print("    ");
    } 

    for (i = 0; i < numberOfDays; i++) {
      if ((i > 0) && (i + startDayOffset) % 7 == 0) {
        System.out.println();
      }

      days.get(i).printDay();
    }

    System.out.println();
  }
  public void printInfo() {
    System.out.println(toString());
  }
  public void printTitle() { 
    System.out.println("         " + name + ", " + year);
    System.out.println("-----------------------------");
    System.out.println(" Sun Mon Tue Wed Thu Fri Sat");
  }
  public void setDays(ArrayList<Day> days) {
    this.days = days;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String toString() {
    String data = "";

    for (Day day : days) {
      data = data + day.toString() + "\n";
    }
    return data;
  }
}

class Day {
  private String name;
  private int number;

  public Day() {
    number = 0;
    name = new String();
  }
  public Day(String name, int number) {
    this.name = name;
    this.number = number;
  }
  public String getName() {
    return name;
  }
  public int getNumber() {
    return number;
  }
  public void printDay() {
    if (number < 10) {
      System.out.print(" ");
    }
    System.out.print("  " + number);
  }
  public void printInfo() {
    System.out.println(toString());
  }
  public void setName(String name) {
    this.name = name;
  }
  public void setNumber(int number) {
    this.number = number;
  }
  public String toString() {
    return "Name:   " + name + "\n" +
           "Number: " + number + "\n";
  }
}

Answer 1

In class Calendar :

In this class , it defines a private type object of Year class and then in its default constructor

it assign default value of Year object. And after that it calls the printCalender() method of year class

using Year class object in its printCalendar() method.

In Class Year:

* First defines two variables one is ArrayList of Month object type and second for number of month.

* Then three constructors of year type

- one default constructor that sets the default value of year to 2013.

- one parameterized constructor with one parameter of number that initializes the number variable and calls

the initializeMonths() method.

- one with two parameters of Month type or number variable and it initializes the month and number variable.

* Next it declares initializeMonths() method. in this method first it assign month variable with 12 elements of month type

then adds every month name to Month ArrayList with number of month.

* Next method isLeapYear(int year) checks the given year is leap year or not.

* In printCalender() method it calls the printCalender() method of Month class.

In Class Month:

*In this first defines three variables one of ArrayList of Day class type , second is String type

for days name and last is int type for year.

*Then three constructor of Month class

-one is default constructor that initializes all variables .

-one with two arguments name of days and year value.

-one with three arguments Day object , name and year value.

*Next it defines a method convertNameToNumber() that return integer value. In this default value is one

and after it returns number of months according to their name.

*Next it defines a method determineNumberOfDays() that return integer value. In this it returns number of days according

to month name and leap year.

*Next it defines a method determineNumberOfDays() with one argument of month number that return integer value. In this it returns number of days according

to month number and leap year.

*Next it defines a method determineStartDayOffset() that return integer value to get total number of days .

* Getters for Days ArrayList and Name variable.

* Next defines a method initializeDays() that initializes days according to week and days of week.

* Next defines a method printCalendar() that prints the calendar in a specified manner.

* Next defines a method printInfo() that prints the toString method.

* Next defines a methodprintTitle() that prints the title for calendar.

* Next is toString() method that return Days object.

In Class Day:

*In this first defines two variables one of String type name and second number for days.

*Defines two constructors

-one is default constructor that initializes the number and name variable to default value.

-one with two arguments that initializes the number and name variable with arguments.

*Getters and Setters for Name and Number variables.

*Next defines a method printDay() that prints the number of day.

*Next defines a method printInfo() that prints the toString() method.

*Next toString method that returns name and number of day.