# How to check whether given year is leap year or not in Java?

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__Problem Description__ :

Write a program in Java that checks whether given year is leap year or not with proper validations.

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__Concept__ :

A leap year is a year containing one additional day. Leap year has 366 days. If any year satisfies any one of following two conditions than we can say that year is a leap year.

- It is evenly divisible by 4 but not 100.
- It is evenly divisible by 400.

**Examples**: 2000,2004, 2008 etc.

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__Java Program__ :

package com.javamultiplex.datetime; import java.util.Scanner; /** * * @author Rohit Agarwal * @category Date and Time * @problem Year is leap year or not? * */ public class LeapYear { /* * Year is called leap year if. * 1) It is evenly divisible by 4 and not by 100. * 2) It is evenly divisible by 400. */ public static void main(String[] args) { Scanner input = null; try { input = new Scanner(System.in); System.out.println("Enter year : "); String year = input.next(); if (isValidYear(year)) { if (isLeapYear(year)) { System.out.println("This is leap year."); } else { System.out.println("This is not leap year."); } } else { System.out.println("Year should be 4 digit long."); } } finally { if (input != null) { input.close(); } } } private static boolean isValidYear(String year) { boolean result = false; // Regular expression that matches a String contains 4 digits. String pattern = "[0-9]{4}"; if (year.matches(pattern)) { result = true; } return result; } private static boolean isLeapYear(String year) { boolean result = false; // Converting String to int. int myYear = Integer.parseInt(year); if ((myYear % 4 == 0 && myYear % 100 != 0) || myYear % 400 == 0) { result = true; } return result; } }

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__Output__ :

### Case 1 :

Output - Given year is not leap year.## Case 2 : |

Output - Given year is leap year. |

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References :

References

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**Tags : Date and Time problems, Leap year, Solution in Java, String, Regular expressions, if else statement.**

How to check whether given year is leap year or not in Java?
Reviewed by Rohit Agarwal
on
12/16/2016
Rating:

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