Why is my leap year algorithm not working (Java)? [duplicate]

Answer 1

Firstly your isLeapYear condition needs to change.

boolean isLeapYear = ((Year % 4 == 0) && (Year % 100 != 0) || (Year % 400 == 0));

Next your if(TwentyEight.contains(Month)) for this need to change to consider leap year.

if(TwentyEight.contains(Month) && !isLeapYear) {
        System.out.println(Month + " " + Year + " has " + DaysTwentyEight
                + " days in it.");
}