# This program Checks if a given year is leap year or not

import java.util.Scanner;

public class LeapYear {

    public static void main(String[] args) {
	int year;
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter an year: ");
    int year = sc.nextInt();
    if(year%4 == 0)
    {
        if( year%100 == 0)
        {
            // year is divisible by 400, hence the year is a leap year
            if ( year%400 == 0)
                 System.out.println(year+" is a leap year.");
            else
                 System.out.println(year+" is not a leap year.");
        }
        else
                System.out.println(year+" is a leap year.");
    }
    else
                System.out.println(year+" is not a leap year.");
    
}


Output
Enter a year: 1900
1900 is not a leap year.