Check if a year is a leap year

Description: Write a method isLeap(int year). A year is a leap year if it is divisible by 4, but not by 100, unless it is divisible by 400. Test 1900, 2000, 2024 and 2026.

Hint:

• Use the remainder operator %.

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Solution

public class Main {
    static boolean isLeap(int year) {
        return (year % 4 == 0 && year % 100 != 0) || year % 400 == 0;
    }

    public static void main(String[] args) {
        for (int y : new int[]{1900, 2000, 2024, 2026}) {
            System.out.println(y + " -> " + isLeap(y));
        }
        System.out.println(java.time.Year.isLeap(2024));       // the library method
    }
}

How it works

• 1900 is divisible by 100 but not by 400, so it is not a leap year. 2000 is divisible by 400, so it is.
• Java has this check ready: Year.isLeap().

Read Java Operators.

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