public int getAge (int _year, int _month, int _day) {
GregorianCalendar cal = new GregorianCalendar();
int y, m, d, a;
y = cal.get(Calendar.YEAR);
m = cal.get(Calendar.MONTH);
d = cal.get(Calendar.DAY_OF_MONTH);
cal.set(_year, _month, _day);
a = y - cal.get(Calendar.YEAR);
if ((m < cal.get(Calendar.MONTH))
|| ((m == cal.get(Calendar.MONTH)) && (d < cal
.get(Calendar.DAY_OF_MONTH)))) {
--a;
}
if(a < 0)
throw new IllegalArgumentException("Age < 0");
return a;
}
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