Java中日期加一天解决方法

java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat(
"yyyy-MM-dd");
java.util.Date todate = sdf.parse(endtime);
Calendar gc = Calendar.getInstance();
gc.setTime(todate);
gc.add(Calendar.DAY_OF_MONTH, -1 );
endtime = sdf.format(gc.getTime());