java String 与Java.util.Date的互相转化

		try {
			//String 与 Date的转换
			SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
			String str="2015-11-23 12:33:56" ;
			Date date = sdf.parse(str);			
			System.out.println(date);
			
			String str2=sdf.format(date);
			System.out.println(str2);				
		} catch (ParseException e) {
			e.printStackTrace();
		}		try {
			//String 与 Date的转换
			SimpleDateFormat