Leap Year

Every 4th year is leap year,
but every 100th is not,
Every 400th year is leap year,
but every 4000th is not.

Hence,
1996 - leap Year
2000 - Leap year
2100 - non leap year
4000 - non leap year.

Pseudo code

if year is divisible by 400 then
   is_leap_year
else if year is divisible by 100 then
   not_leap_year
else if year is divisible by 4 then
   is_leap_year
else
   not_leap_year

Java code

import java.util.Scanner;
public class LeapYear {
    public static void main(String[] args) {
        Scanner lukija = new Scanner(System.in);
        System.out.print("Give year: ");
        int year = Integer.parseInt(lukija.nextLine());
        if (year % 4 == 0 && ( year % 100 != 0 || year % 400 == 0 ) ) {
            System.out.println("Year is leap year");
        } else {
            System.out.println("Year is not a leap year..");
        }
    }
}