Redesign PrintCalendar

add one member variable, a constructor, get and set methods for the variable, convert the static methods to instance methods, and overrides the toString methods to the following code, and redesign the main to test.

package chapter6;

import java.util.Scanner;

public class PrintCalendar { /** Main method */ public static void main(String[] args) { Scanner input = new Scanner(System.in);

// Prompt the user to enter year System.out.print("Enter full year (e.g., 2001): "); int year = input.nextInt();

// Prompt the user to enter month System.out.print("Enter month in number between 1 and 12: "); int month = input.nextInt();

// Print calendar for the month of the year printMonth(year, month); }

/** Print the calendar for a month in a year */ public static void printMonth(int year, int month) { // Print the headings of the calendar printMonthTitle(year, month);

// Print the body of the calendar printMonthBody(year, month); }

/** Print the month title, e.g., May, 1999 */ public static void printMonthTitle(int year, int month) { System.out.println(" " + getMonthName(month) + " " + year); System.out.println("-----------------------------"); System.out.println(" Sun Mon Tue Wed Thu Fri Sat"); }

/** Get the English name for the month */ public static String getMonthName(int month) { String monthName = ""; switch (month) { case 1: monthName = "January"; break; case 2: monthName = "February"; break; case 3: monthName = "March"; break; case 4: monthName = "April"; break; case 5: monthName = "May"; break; case 6: monthName = "June"; break; case 7: monthName = "July"; break; case 8: monthName = "August"; break; case 9: monthName = "September"; break; case 10: monthName = "October"; break; case 11: monthName = "November"; break; case 12: monthName = "December"; }

return monthName; }

/** Print month body */ public static void printMonthBody(int year, int month) { // Get start day of the week for the first date in the month int startDay = getStartDay(year, month);

// Get number of days in the month int numberOfDaysInMonth = getNumberOfDaysInMonth(year, month);

// Pad space before the first day of the month int i = 0; for (i = 0; i < startDay; i++) System.out.print(" ");

for (i = 1; i <= numberOfDaysInMonth; i++) { System.out.printf("%4d", i);

if ((i + startDay) % 7 == 0) System.out.println(); }

System.out.println(); }

/** Get the start day of month/1/year */ public static int getStartDay(int year, int month) { final int START_DAY_FOR_JAN_1_1800 = 3; // Get total number of days from 1/1/1800 to month/1/year int totalNumberOfDays = getTotalNumberOfDays(year, month);

// Return the start day for month/1/year return (totalNumberOfDays + START_DAY_FOR_JAN_1_1800) % 7; }

/** Get the total number of days since January 1, 1800 */ public static int getTotalNumberOfDays(int year, int month) { int total = 0;

// Get the total days from 1800 to 1/1/year for (int i = 1800; i < year; i++) if (isLeapYear(i)) total = total + 366; else total = total + 365;

// Add days from Jan to the month prior to the calendar month for (int i = 1; i < month; i++) total = total + getNumberOfDaysInMonth(year, i);

return total; }

/** Get the number of days in a month */ public static int getNumberOfDaysInMonth(int year, int month) { if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) return 31;

if (month == 4 || month == 6 || month == 9 || month == 11) return 30;

if (month == 2) return isLeapYear(year) ? 29 : 28;

return 0; // If month is incorrect }

/** Determine if it is a leap year */ public static boolean isLeapYear(int year) { return year % 400 == 0 || (year % 4 == 0 && year % 100 != 0); } }