例4.8 写一程序，判断某一年是否闰年。

以下是一个判断某一年是否为闰年的Java程序的例子：

import java.util.Scanner;

public class LeapYear {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter year: ");
        int year = scanner.nextInt();
        boolean leap = false;

        if (year % 4 == 0) {
            if (year % 100 == 0) {
                if (year % 400 == 0)
                    leap = true;
            } else
                leap = true;
        }

        if (leap)
            System.out.println(year + " is a leap year.");
        else
            System.out.println(year + " is not a leap year.");
    }
}