java中如何对字符串格式的Date进行排序? [英] How to sort Date which is in string format in java?

问题描述

我有一个 arraylist 字符串值，如

I have an arraylist with string values like

ArrayList<String> datestring=new ArrayList<String>();
datestring.add("01/21/2013 @03:13 PM");
datestring.add("01/21/2013 @04:37 PM");
datestring.add("01/21/2013 @10:41 AM");
datestring.add("01/21/2013 @10:48 AM");
datestring.add("01/22/2013 @06:16 AM");
datestring.add("01/22/2013 @06:19 AM");
datestring.add("01/21/2013 @05:19 PM");
datestring.add("01/21/2013 @05:19 PM");

任何机构可以帮助我对上面的列表进行排序吗?以便根据 AM 和 PM 格式对值进行排序.
排序后的预期输出应该是

Can any body help me on sorting the above list? So that the values are sorted according to AM and PM format.
The expected output after sorting should be

for (String s : datestring)
{
    System.out.println(s);
}

.

01/21/2013 @10:41 AM;
01/21/2013 @10:48 AM;
01/21/2013 @03:13 PM;
01/21/2013 @04:37 PM;
01/21/2013 @05:16 PM;
01/21/2013 @05:19 PM;
01/22/2013 @06:16 AM;
01/22/2013 @06:19 AM;

推荐答案

试试这个

    Collections.sort(datestring, new Comparator<String>() {
        DateFormat f = new SimpleDateFormat("MM/dd/yyyy '@'hh:mm a");
        @Override
        public int compare(String o1, String o2) {
            try {
                return f.parse(o1).compareTo(f.parse(o2));
            } catch (ParseException e) {
                throw new IllegalArgumentException(e);
            }
        }
    });

或使用 Java 8

or with Java 8

    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM/dd/yyyy '@'hh:mm a");
    Collections.sort(datestring, (s1, s2) -> LocalDateTime.parse(s1, formatter).
            compareTo(LocalDateTime.parse(s2, formatter)));

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