Question

How to check leap year in Java

Answer 1

import java.util.Scanner;
 
public class JavaApplication1 
{
    public static void main(String[] args) 
    {
        try
        {
            Scanner in = new Scanner(System.in);
            System.out.print("Enter a year: ");
            int year = in.nextInt();
           
            if (year % 400 == 0)
                System.out.format("%d is a leap year.\n", year);
            else if (year % 100 == 0)
                     System.out.format("%d is not a leap year.\n", year);
                 else if (year % 4 == 0)
                          System.out.format("%d is a leap year.\n", year);
                      else
                          System.out.format("%d is not a leap year.\n", year);  
        }
        catch (Exception e)
        {
            System.out.println(e.toString());
        } 
    }
}


 
/*
 
run:
 
Enter a year: 2016
2016 is a leap year.
 
*/

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Answer 2

public class JavaApplication1 
{
    public static void main(String[] args) 
    {
        try
        {
            int[] years = {2000, 2400, 1800, 1900, 2100, 2200, 2300, 2500,
                           2008, 2012, 2016, 2020, 2024, 2048, 2032};
  
                for (int yr : years)
                {
                    if (isLeapYear(yr))
                        System.out.format("%d is a leap year.\n", yr);
                    else
                        System.out.format("%d is not a leap year.\n", yr);  
                }
        }
        catch (Exception e)
        {
            System.out.println(e.toString());
        }  
    }
    static boolean isLeapYear(int year)
    {
        if (year % 400 == 0)
            return true;
        else if (year % 100 == 0)
                 return false;
        else if (year % 4 == 0)
                 return true;
  
        return false;
    }
}
 
 
 
 
/*
 
run:
 
2000 is a leap year.
2400 is a leap year.
1800 is not a leap year.
1900 is not a leap year.
2100 is not a leap year.
2200 is not a leap year.
2300 is not a leap year.
2500 is not a leap year.
2008 is a leap year.
2012 is a leap year.
2016 is a leap year.
2020 is a leap year.
2024 is a leap year.
2048 is a leap year.
2032 is a leap year.
 
*/

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