1 public static int getAge(Date birthDay) throws Exception { 2         Calendar cal = Calendar.getInstance(); 3  4         if (cal.before(birthDay)) { 5             throw new IllegalArgumentException( 6                 "The birthDay is before Now.It's unbelievable!"); 7         } 8  9         int yearNow = cal.get(Calendar.YEAR);10         int monthNow = cal.get(Calendar.MONTH);11         int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH);12         cal.setTime(birthDay);13 14         int yearBirth = cal.get(Calendar.YEAR);15         int monthBirth = cal.get(Calendar.MONTH);16         int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH);17 18         int age = yearNow - yearBirth;19 20         if (monthNow <= monthBirth) {21             if (monthNow == monthBirth) {22                 //monthNow==monthBirth23                 if (dayOfMonthNow < dayOfMonthBirth) {24                     age--;25                 } else {26                     //do nothing27                 }28             } else {29                 //monthNow>monthBirth30                 age--;31             }32         } else {33             //monthNow

转载: http://www.blogjava.net/iamtin/archive/2006/03/10/34608.html