Detect months with 31 days

Question

Is there an analogous form of the following code:

if(month == 4,6,9,11)
{
  do something;
}

Or must it be:

if(month == 4 ||         


        

Answer 1

For dates I use Joda Time mentioned earlier, but I understand if it's not applicable for you. If you just want it to look nice, you can first define a list with values that you're interested in and then check if your month is in that list:

// This should be a field in a class
// Make it immutable
public static final List LONGEST_MONTHS = 
        Collections.immutableList(Arrays.asList(4,6,9,11));

// Somewhere in your code
if(LONGEST_MONTHS.contains(month)) {
    doSomething();
}