Calendar

// Copyright Adonis S. Deliannis, 2012
// All rights Reserved


package net.calendar.app;

import java.util.Calendar;
import java.util.Scanner;

public final class Program {

    public Program() {

    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        Program P = new Program();
        int Year = 0, Start = 0;
        Scanner scin = new Scanner(System.in);
        P.print("Please enter a Year: ");

        Year = scin.nextInt();
        Calendar cal = Calendar.getInstance();
        cal.clear();
        cal.set(Year, 0, 0);
        Start = cal.get(Calendar.DAY_OF_WEEK);
        if(Start > 6)
            Start = 0;
        for (int Month = 1; Month <= 12; Month++) {
            P.printOneMonth(Month, Year, Start);
            Start = (Start + P.daysOfMonth(Month, Year, true)) % 7;

            P.print("Enter random text and press enter...\r\n");
            scin.next();

            P.println();
        }
    }

    public void println() {
        System.out.println();
    }

    public void println(Object O) {
        System.out.println(O);
    }

    public void print(Object O) {
        System.out.print(O);
    }

    public boolean isLeapYear(int Year) {
        return (Year % 4) == 0 && (Year % 100) != 0 || (Year % 400) == 0;
    }

    public String printMonthName(int Month) {
        switch (Month) {
        case 1:
            return "January";
        case 2:
            return "February";
        case 3:
            return "March";
        case 4:
            return "April";
        case 5:
            return "May";
        case 6:
            return "June";
        case 7:
            return "July";
        case 8:
            return "August";
        case 9:
            return "September";
        case 10:
            return "October";
        case 11:
            return "November";
        case 12:
            return "December";
        }
        return "Not a valid month";
    }

    public int printWeekTitle(int Month, int Day, int Year) {
        Calendar cal = Calendar.getInstance();
        cal.clear();
        cal.set(Year, Month, Day);
        return cal.get(Calendar.WEEK_OF_YEAR);
    }

    public void printOneMonth(int month, int year, int start) {
        int nextDay = start;
        int totalDays = daysOfMonth(month, year, false);
        // Write code to call method to print month name
        // Write code to call method to print week title
        // Write code to call method to move cursors to the right starting
        // position.

        System.out.printf("%10s%10s%10s%10s%10s%10s%10s", "Sun", "Mon", "Tue",
                "Wed", "Thu", "Fri", "Sat");
        println();
        for (int i = 1; i <= start; i++)
            System.out.printf("%10s", "");

        for (int dates = 1; dates <= totalDays; dates++) {
            System.out.printf("%10d", dates);
            nextDay = (nextDay + 1) % 7;
            if (nextDay == 0)
                println();
        }
        println();
    }

    public int daysOfMonth(int Month, int Year, boolean SuppressMessage) {

        if (!SuppressMessage) {
            String format = String.format(
                    "Calculating the days of the Month of %s in %s",
                    printMonthName(Month), Year);
            println(format);
        }
        switch (Month) {
        // January, March, May, July, August, October, December
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
            if (!SuppressMessage)
                println("The Month of " + printMonthName(Month) + " has " + 31
                        + " days.");
            return 31;

            // April, June, September, November
        case 4:
        case 6:
        case 9:
        case 11:
            if (!SuppressMessage)
                println("The Month of " + printMonthName(Month) + " has " + 30
                        + " days.");
            return 30;

            // February
        case 2:
            if (isLeapYear(Year)) {
                if (!SuppressMessage)
                    println("The Month of " + printMonthName(Month) + " has "
                            + 29 + " days.");
                return 29;
            } else {
                if (!SuppressMessage)
                    println("The Month of " + printMonthName(Month) + " has "
                            + 28 + " days.");
                return 28;
            }
        }
        return 0;
    }
}