How to use the Calendar class to determine leap years in normal years

package calendartest;

import java.util.Calendar;
import java.util.Scanner;

public class Test03 {
    public static void main(String[] args) {

        Scanner s = new Scanner(System.in);
        while (s.hasNext()) {
            int year = Integer.parseInt(s.nextLine());
            boolean b = isLeapYear(year);
            System.out.println(b);
        }
    }

    // 判断是否是闰年
    public static boolean isLeapYear(int year) {

        // 创建Calendar对象
        Calendar c = Calendar.getInstance();

        // 将年月日设置为：year年2月28日，即参数为year, 1, 28
        c.set(year, 1, 28);

        // 天数加1
        c.add(Calendar.DAY_OF_MONTH, 1);

        // 是29号，是闰年，否则平年
        return c.get(Calendar.DAY_OF_MONTH) == 29;
    }
}