【时间大小】 比较 java

String s1="2013-01-25 09:12:09"; String s2="2013-01-29 09:12:11";DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Calendar c1 = Calendar.getInstance(); Calendar c2 = Calendar.getInstance(); try{       c1.setTime(df.parse(s1));       c2.setTime(df.parse(s2)); }catch(ParseException e){       System.err.println("格式不正确"); } int result=c1.compareTo(c2); if(result==0)       System.out.println("s1相等s2"); else if(result<0)       System.out.println("s1小于s2"); else       System.out.println("c1大于s2");