How to find all leap years between two given years in Java?



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 {
    System.out.println("Please enter valid year limits.");
   }
  } 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 of Java program that prints all the leap years between two given years.
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

Thank you friends, I hope you have clearly understood the solution of this problem. If you have any doubt, suggestion or query please feel free to comment below. You can also discuss this solution in our forum.

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

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How to find all leap years between two given years in Java? How to find all leap years between two given years in Java? Reviewed by Rohit Agarwal on 1/05/2017 Rating: 5

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