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public static void main(String[] args) throws Exception {
String s = "2012-01-31";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date day = sdf.parse(s);
Calendar c = Calendar.getInstance();
c.setTime(day);
c.add(Calendar.DATE, 1);
System.out.println(sdf.format(c.getTime()));
}