Java: Check if a year is leap year

public static boolean isLeapYear(int year) {
    assert year >= 1583; // not valid before this date.
    return ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
}

public static boolean isLeapYear(int year) {
    Calendar cal = Calendar.getInstance();
    cal.set(Calendar.YEAR, year);
    return cal.getActualMaximum(DAY_OF_YEAR) > 365;
}