Java Utililty Methods Leap Year Check

if (y % 4 == 0) {
    if (y % 100 == 0) {
        if (y % 400 == 0) {
            return true;
        } else {
            return false;
    } else {
...

boolean result = false;
if (((y % 4) == 0) && 
        ((y < 1582) || 
                ((y % 100) != 0) || 
                ((y % 400) == 0))) { 
    result = true; 
return result;
...

int mod4;
int mod400;
boolean leap_year;
mod4 = year % 4;
mod400 = year % 400;
if (mod4 == 0 && mod400 != 100 && mod400 != 200 && mod400 != 300) {
    leap_year = true;
} else {
...

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

Verify if a given year is leap.

if (year % 4 == 0) {
    return year % 100 != 0 ? true : year % 400 == 0;
return false;

Calendar calendar = Calendar.getInstance();
calendar.set(year, 2, 1);
calendar.add(Calendar.DATE, -1);
if (calendar.get(Calendar.DAY_OF_MONTH) == 29) {
    System.out.println(year + " year is a leap year.");
    return true;
} else {
    System.out.println(year + " year is not a leap year.");
...

if ((year & 3) != 0) {
    return false;
if ((year % 100) != 0) {
    return true;
return (year % 400) == 0;

return year >= gregoranCutoverYear ? ((year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0)))
        : (year % 4 == 0);

boolean isLeapYear = false;
if (year > 0 && (year % 4) == 0) {
    isLeapYear = true;
    if ((year % 1000) == 0) 
        if ((year % 400) != 0) {
            isLeapYear = false;
return (isLeapYear);

if (year < 1582) {
    if (year % 4 == 0)
        return true;
if (year % 100 == 0 && (year / 100) % 4 != 0)
    return false;
if (year % 4 == 0)
    return true;
...