## Problem Description :

Write a program in Java that prints all the leap years between two given years with proper validations.

## 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.

## Recommended :

How to check whether given year is leap year or not?

## Java Program :

```package com.javamultiplex.datetime;

import java.util.Scanner;

/**
*
* @author Rohit Agarwal
* @category Date and Time
* @problem Print all the leap years between two given years
*
*/
public class LeapYearsBetweenYears {

public static void main(String[] args) {

Scanner input = null;
try {
input = new Scanner(System.in);
System.out.println("Enter lower limit of year : ");
String lower = input.next();
System.out.println("Enter upper limit of year : ");
String upper = input.next();
if (isValidYear(lower) && isValidYear(upper)
&& (lower.compareTo(upper) < 0)) {
// Converting String to Integer
int year1 = Integer.parseInt(lower);
int year2 = Integer.parseInt(upper);
System.out.println("Leap years : ");
for (int i = year1; i <= year2; i++) {
if (isLeapYear(i)) {
System.out.println(i);
}
}
} else {
}
} 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(int myYear) {

boolean result = false;
if ((myYear % 4 == 0 && myYear % 100 != 0) || myYear % 400 == 0) {
result = true;
}
return result;
}

}
```

## Output :

 Output - How to find leap years between two given years in Java?

## References :

https://docs.oracle.com/javase/7/docs/api/java/lang/String.html

https://en.wikipedia.org/wiki/Regular_expression

https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html

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Tags : Date and Time problems, leap years between two years, Solution in Java, String, Regular expressions, if else statement, for loop.