Java Program to Check Leap Year

Posted in Java Tutorial

Updated on Oct 30, 2024

By Mari Selvan

👁️ 129 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

🙋 Introduction

In the realm of programming, determining whether a given year is a leap year is a common requirement. A leap year is a year that is evenly divisible by 4, except for end-of-century years, which must be divisible by 400 to be a leap year. Checking for leap years involves implementing specific rules to validate the year.

In this tutorial, we will explore a Java program designed to check whether a given year is a leap year.

📄 Example

Let's delve into the Java code that accomplishes this task.

LeapYearChecker.java

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import java.util.Scanner;

public class LeapYearChecker {
  // Function to check if a year is a leap year
  static boolean isLeapYear(int year) {
    // Leap year conditions
    return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
  }

  // Driver program
  public static void main(String[] args) {
    // Replace this value with the year you want to check
    int year = 2024;

    // Call the function to check if the year is a leap year
    if (isLeapYear(year)) {
      System.out.println(year + " is a leap year.");
    } else {
      System.out.println(year + " is not a leap year.");
    }
  }
}

💻 Testing the Program

To test the program with different years, modify the value of year in the main method.

Output

2024 is a leap year.

Compile and run the program to check if the specified year is a leap year.

🧠 How the Program Works

The program defines a class LeapYearChecker containing a static method isLeapYear that takes an integer year as input and returns true if the year is a leap year, and false otherwise.
The method checks leap year conditions: the year must be divisible by 4 and not divisible by 100, or it must be divisible by 400.
Inside the main method, replace the value of year with the desired year you want to check.
The program calls the isLeapYear method and prints the result.

📏 Between the Given Range

Let's dive into the java code that checks for leap years in the specified range.

LeapYearChecker.java

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public class LeapYearChecker {

  // Function to check for leap years in the range
  static void checkLeapYears(int startYear, int endYear) {
    System.out.printf("Leap Years in the range %d to %d:\n", startYear, endYear);

    for (int year = startYear; year <= endYear; year++) {
      if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) {
        System.out.print(year + " ");
      }
    }

    System.out.println();
  }

  // Driver program
  public static void main(String[] args) {
    // Define the range
    int startYear = 2024;
    int endYear = 2050;

    // Call the function to check leap years
    checkLeapYears(startYear, endYear);
  }
}

💻 Testing the Program

The provided code is already set to check for leap years in the range from 2024 to 2050.

Output

Leap years in the range 2024 to 2050:
2024 2028 2032 2036 2040 2044 2048

Compile and run the program to see the leap years in the specified range.

🧠 How the Program Works

The program defines a class LeapYearChecker containing a static method checkLeapYears that takes the start and end years of the range as input and prints the leap years within that range.
Inside the method, it iterates through each year in the range and checks if it satisfies the leap year conditions.
If a year meets the conditions, it is printed as a leap year.
The main method tests the program by providing the range from 2024 to 2050.

🧐 Understanding the Concept of Leap Year

Before delving into the code, let's understand the concept of leap years. Leap years are years that are evenly divisible by 4, except for end-of-century years, which must be divisible by 400 to be a leap year.