Java Program for finding Numbers of day in a Month| infoStud blogs

Finding the number of days in a month required basic knowledge of conditional statements. In Java, programmers can easily find out a number of days by using "if-else" and "Switch"  concepts of conditional statements. We all know there are 12 months in a year and each month has 29-31 days. 

In the case of Leap year which comes in the gap of 4 years, February has only 28 days. By considering all the information, the programmer can write a java program for finding the numbers of days in a Month (Including Leap Year). So let's begin. 

Question

Write a Java program to find the number of days in a month. 

Code

import java.util.Scanner;

public class Numberofdayinmonth {

    public static void main (String args[]){

        Scanner input = new Scanner(System.in);

        int number_Of_DaysInMonth = 0; 

        String MonthOfName = "Unknown";

        System.out.print("Input a month number: ");

        int month = input.nextInt();

        System.out.print("Input a year: ");

        int year = input.nextInt();

        switch (month) {

            case 1:

                MonthOfName = "January";

                number_Of_DaysInMonth = 31;

                break;

            case 2:

                MonthOfName = "February";

                if ((year % 400 == 0) || ((year % 4 == 0) && 

(year % 100 != 0))) {

                    number_Of_DaysInMonth = 29;

                } else {

                    number_Of_DaysInMonth = 28;

                }

                break;

            case 3:

                MonthOfName = "March";

                number_Of_DaysInMonth = 31;

                break;

            case 4:

                MonthOfName = "April";

                number_Of_DaysInMonth = 30;

                break;

            case 5:

                MonthOfName = "May";

                number_Of_DaysInMonth = 31;

                break;

            case 6:

                MonthOfName = "June";

                number_Of_DaysInMonth = 30;

                break;

            case 7:

                MonthOfName = "July";

                number_Of_DaysInMonth = 31;

                break;

            case 8:

                MonthOfName = "August";

                number_Of_DaysInMonth = 31;

                break;

            case 9:

                MonthOfName = "September";

                number_Of_DaysInMonth = 30;

                break;

            case 10:

                MonthOfName = "October";

                number_Of_DaysInMonth = 31;

                break;

            case 11:

                MonthOfName = "November";

                number_Of_DaysInMonth = 30;

                break;

            case 12:

                MonthOfName = "December";

                number_Of_DaysInMonth = 31;

        }

        System.out.print(MonthOfName + " " + year + " has " + 

number_Of_DaysInMonth + " days\n");

    } 

}

Output

Input a month number: 4

Input a year: 2026

April 2026 has 30 days

How Code Work

Now it's time to understand the code that how it works.

Steps:

1. The programmer has to make class and the main method first. After making a class Scanner Method will be used for taking inputs from the user.