字符串转日期 19080101转成1980-01-01

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public static void main(String[] args) {
		Function501528 f=new Function501528();
		String date = "19800101";
		Date dd= f.StrToDate(date);
		System.out.println(dd);
		System.out.println(DateToStr(dd));
		 
	}
	public static String DateToStr(Date date) {
		  
		   SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
		   String str = format.format(date);
		   return str;
		}
	public static Date StrToDate(String str) {
		  
		   SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
		   Date date = null;
		   try {
		    date = format.parse(str);
		   } catch (ParseException e) {
		    e.printStackTrace();
		   }
		   return date;
		}