problem with SetWorkDays()

[vishal.superb]

i tried to set saturday as a working day using setWorkDays() but it din turn out.
what i did is:

int workDays[] = new int[]{1,2,3,4,5,6};
calendar.setWorkDays(workDays);
calendar.setFirstDayOfWeek(1);

but it dint set saturday as a working day.
but when i try the same code with array: new int[]{1,2,3,4}
it makes friday as non working day.

help me making saturday as a working day in my code.