Java Boolean Logical Operators check leap year

Question

We would like to check if a year is leap year.

A year is a leap year if it is divisible by 4 but not by 100, or if it is divisible by 400.

You can use the following Boolean expressions to check whether a year is a leap year:

// A leap year is divisible by 4 
boolean isLeapYear = (year % 4 == 0); 

// A leap year is divisible by 4 but not by 100 
isLeapYear = isLeapYear && (year % 100 != 0); 

// A leap year is divisible by 4 but not by 100 or divisible by 400 
isLeapYear = isLeapYear || (year % 400 == 0);

Or you can combine all these expressions into one like this:

isLeapYear = (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);

import java.util.Scanner; 

public class Main {
  public static void main(String args[]) {
    // Create a Scanner
    Scanner input = new Scanner(System.in);
    System.out.print("Enter a year: ");
    int year = input.nextInt();

    // Check if the year is a leap year 
    boolean isLeapYear = 
      (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);

    // Display the result in a message dialog box
    System.out.println(year + " is a leap year? " + isLeapYear);   
  } 
}

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Java Boolean Logical Operators check leap year

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