java 对日期的处理

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 private static String getString(Date date){            SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");            String str=sf.format(date);            return str;        }     private static String getString(){         Date date =new Date();            SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");            String str=sf.format(date);            return str;        }        private static String getStringdatil(){            Date date=new Date();            SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");            String str=sf.format(date);            return str;        }        private static Date getshangMonth(){             Calendar calendar = Calendar.getInstance();             Date date=new Date();             calendar.setTime(date);             calendar.add(Calendar.MONTH, -1);             return calendar.getTime();        }        private static Date getshangDay(){             Calendar calendar = Calendar.getInstance();             Date date=new Date();             calendar.setTime(date);             calendar.add(Calendar.DAY_OF_MONTH, -1);             return calendar.getTime();        }        private static Date getshangDay(Date date){             Calendar calendar = Calendar.getInstance();             calendar.setTime(date);             calendar.add(Calendar.DAY_OF_MONTH, -1);             return calendar.getTime();        }        private static Date getshangYear(){             Calendar calendar = Calendar.getInstance();             Date date=new Date();             calendar.setTime(date);             calendar.add(Calendar.YEAR, -1);             return calendar.getTime();        }
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