Implementing Monthly Calendar Program In JAVA

In this blog, we learn about Implementing Monthly Calendar.

Introduction

In this blog, we will learn how to get started with Monthly Calendar Program in Java.

 

Software Requirement

JAVA, NOTEPAD. 

import java.util.*;
import java.text.*;

public class MonthCalender {

    public final static String[] monthcalender = {
        "January", "February", "March", "April", "May", "June", "July",
            "August", "September", "October", "November", "December"};

        public final static int daysinmonths[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

        private void displayMonth(int month, int year) {

            int blankdays = 0;
            System.out.println("  " + monthcalender[month] + " " + year);

            if (month < 0 || month > 11) {
                throw new IllegalArgumentException(
                    "Month " + month + " It is not valid and must lie in between 0 and 11");
            }

            GregorianCalendar cldr = new GregorianCalendar(year, month, 1);
            System.out.println("Sunday Monday Tuesday Wednesday Thursday Friday Saturday");


            blankdays = cldr.get(Calendar.DAY_OF_WEEK)-1;
            int daysInMonth = daysinmonths[month];

            if (cldr.isLeapYear(cldr.get(Calendar.YEAR)) && month == 1) {

                ++daysInMonth;
            }

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

            for (int i = 1; i <= daysInMonth; i++) {

                if (i<=9) {
                    System.out.print(" ");
                }
                System.out.print(i);

                if ((blankdays + i) % 7 == 0) {
                System.out.println();
                }
                else {
                    System.out.print(" ");
                }
            }
        }

    public static void main(String[] args) {

        int mon, yr;
        MonthCalender moncldr = new MonthCalender();

        if (args.length == 2) {
            moncldr.displayMonth(Integer.parseInt(args[0])-1, Integer.parseInt(args[1]));
        }
        else {
            Calendar todaycldr = Calendar.getInstance();
            moncldr.displayMonth(todaycldr.get(Calendar.MONTH), todaycldr.get(Calendar.YEAR));
        }
    }
}

Output

 

 

Monthly Calendar has been created successfully. Feel free to comment with some suggesstions.