Java Program to Check Leap Year

May 27, 2023

What is a Calendar class?

In this Article, we will write a Program to Check Leap Year in Java.
The Calendar class in the Java programming language is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week.

Calendar Class:

The Calendar class also provides a number of methods for adding or subtracting time from a calendar, such as add() and roll(), and for comparing two calendars.

Leap Year A leap year is a year that contains an additional day, February 29, to keep the calendar year synchronized with the astronomical or seasonal year. The calendar has a leap year every four years, except for years that are divisible by 100 but not by 400. For example, the year 2000 was a leap year because it was divisible by 400, but the year 1900 was not a leap year because it was divisible by 100 but not by 400. Leap years are necessary to ensure that the seasons, which are determined by the Earth's orbit around the sun, stay aligned with the calendar year.

Java Program to Check Leap Year:

acos() Function

addExact() Function

asin() Function

atan() Function

import java.util.*;

public class Main{
    public static void main(String[] args){
        // Scanner class for taking input
        Scanner input = new Scanner(System.in);
        System.out.print("Enter a year: ");
        int year = input.nextInt();
        
        // Initializing the answer variable
        boolean isLeapYear = false;

        if (year % 4 == 0) {
            if (year % 100 == 0) {
                if (year % 400 == 0) {
                    isLeapYear = true;
                }
            } else {
                isLeapYear = true;
            }
        }

        if (isLeapYear) {
            System.out.println(year + " is a leap year.");
        } else {
            System.out.println(year + " is not a leap year.");
        }
    }
}

Input:

Enter a year: 1900

Output:

1900 is not a leap year.

Explanation:

In the above program,we first take input from the user for the year to be checked. Then, we use a series of if statements to check whether the year is divisible by 4, 100, and 400 to determine whether it is a leap year. Finally, we print out the result of whether the given year is a leap year or not.

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