How to Calculate Leap Year in Java

Every four(4) years, a Leap Year is added to the calendar by adding one additional day, February 29, to the calendar. In today’s tutorial, we’ll learn how to compute Leap Year using Java.

Calculating Leap Year Using Java

Generally, a Leap Year occurs every four years, although regulations for leap years are stated below.

1. If a year is equally divisible by four, it is a leap year.
2. The years divisible by 100, such as 1900 or 2000, cannot be leap years unless they are also divisible by 400. As result, while the years 1600 and 2000 had leap years, the years 1700, 1800, and 1900 did not.
3. It is a leap year if a year meets both preceding criteria.

Let’s have an example. First, the Scanner class is imported here for the user can enter whatever year they like.

The remainder of the if-else blocks is consolidated into a single line to verify if the input year is a leap year. The code example below shows how to check if a year is a leap year or not.

To begin, import the following libraries.

import java.io.*;
import java.util.Scanner;

To keep the year specified by the user, create an int type variable named Useryear in the main class.

int Useryear;

Initialize a Scanner class object. Then, using an object of the Scanner class called s, we take input from the user.

Scanner s = new Scanner(System.in);
Useryear = s.nextInt();

In the first condition, we check if it is a century leap year, and in the 2nd condition, we check if it is a leap year and not a century year.

if ((Useryear % 400 == 0) || ((Useryear % 4 == 0) && (Useryear % 100 != 0)))

If both conditions are true, it will print "Given year is a leap year". Otherwise, a "Given year is not a leap year".

Full Source Code:

import java.io.*;
import java.util.Scanner;

public class leapyear {
  public static void main(String[] args) {
    int Useryear;
    Scanner s = new Scanner(System.in);
    Useryear = s.nextInt();
    if ((Useryear % 400 == 0) || ((Useryear % 4 == 0) && (Useryear % 100 != 0))) {
      System.out.println(Useryear + " : Given year is a leap year");
    } else {
      System.out.println(Useryear + " : Given year is not a leap year");
    }
  }
}

Output:

// Input Year
2000
2000 : Given year is a leap year

// Input Year
2022
2022 : Given year is not a leap year